Bendix Bw2726 Users Manual

Bendix-Sd-13-47672-Users-Manual-682595 bendix-sd-13-47672-users-manual-682595

2015-03-12

: Bendix Bendix-Bw2726-Users-Manual-651065 bendix-bw2726-users-manual-651065 bendix pdf

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1
Bendix® TABS‑6™ Advanced Multi‑Channel Trailer ABS Module
FIGURE 1 - BENDIX® TABS -6™ ADVANCED MULTI-CHANNEL MODULE (BENDIX TABS-6 ADV MC)
1. INTRODUCTION
The Bendix® TABS‑6™ Adv MC module is an integrated multi‑
channel (4S/2M) trailer service brake module controller for
air‑braked heavy‑duty semi‑trailers that features Bendix®
Antilock Brake System (ABS) and Bendix® Trailer Roll Stability
Program (TRSP®).
Installed on semi‑trailers, the module acts as a relay valve
during normal braking, but during ABS events it will intervene
to help maintain vehicle stability and minimize stopping
distance by preventing wheel lock‑up. The Bendix TRSP
monitors the trailer's motion and reduces the risk of roll overs
by automatically applying the brakes when a risk of roll over
is detected.
This module features:
● AmodulardesignwithanintegratedElectronicControlUnit
(ECU);pressuresensors;alateralaccelerationsensor;and
Modulator Relay Valves (MRVs) — eliminating external
pigtail harnesses for these components.
● Anoperatingvoltagerangeof8-32volts.
● Anelectronicodometerwithtripcounters&serviceinterval
options.
● A scratch-pad feature with up to 1,008 bytes of freely
denableread/writetextspaceavailableforcustomeruse.
● Anextendeddataloggingfeature,includingaresettable
drive recorder.
Section TABLE OF CONTENTS ...........PAGE
1. Introduction ...........................1-2
2. Safe Maintenance Practices ................2
3. AntilockBrakeSystem(ABS)Operation .......3
4. TrailerRollStabilityProgram(TRSP)Operation 4
5. Components ..........................5‑6
6. Mounting ...............................7
7. Pigtail Wiring Harnesses . . . . . . . . . . . . . . . . . . .7
8. ABSIndicatorLamp.......................8
9. Bendix® WS‑24™ Wheel Speed Sensors .......8
10. SAEJ2497(PLC)DiagnosticLink ...........9
11. SAEJ1939(CAN)DiagnosticLink ...........9
12. AuxiliaryI/O .............................9
13. Bendix® ABS Flex™ Program ...............10
14. CustomerScratchPad....................10
15. Power-UpSequence . . . . . . . . . . . . . . . . . . . . .10
16. OdometerFunction ......................10
17. Non-StandardTireSize ...................11
18. DiagnosticTroubleCodeDetection ..........11
19. PartialABSShutdown . . . . . . . . . . . . . . . . . . . . 11
20. BlinkCodeDiagnostics ................ 11-12
21. AuxiliaryFeatures .......................12
22. DiagnosticTroubleCodes(DTCs)........13-19
Troubleshooting Section...................20-40
Mounting Studs Mounting Studs
ECU Cover
(Sealed) ECU Connector Covers
on Both Sides
(Removable)
Cover Lock
with Slide Lock
Tab
12-Pin Connector 7-Pin
Connector
SD‑13‑47672
Wheel Speed
Sensor
Connectors
Wheel Speed
Sensor
Connectors
For Port
Descriptions
See Page 3 For Part Label Information
See Page 40
Part Number
Etched Here
2
● Awidevarietyofelectricalinputs/outputs(I/Os)allow
the customer to program auxiliary functions such as:
automatic LiftAxle Control (LAC); Integrated Speed
Switch (ISS); external load sensors; andAuxiliary
Design Language (ADL) for customized auxiliary
functions.
● A wide range of diagnostic tools for flexible
troubleshooting:BlinkCodes;SAEJ2497(PLC);SAE
J1939(CAN)Diagnostics;theBendix® Trailer Remote
Diagnostic Unit (TRDU); and the Bendix® Trailer
Information Module.
● Support for SAE J2497 Power Line Carrier (PLC)
communicationtothetowingvehicle&diagnostics.
● Support for SAE J1939 (CAN) communication for
diagnostics and external devices.
● Apressure-equalizingvalveinthesealedECUhousing
to give improved protection from water, etc.
● Aserviceablenylonltertohelppreventforeignmaterial
from entering the control port.
● Lockingdustcoverstoprovideelectricalconnectorand
cable protection.
2. SAFE MAINTENANCE PRACTICES
WARNING! PLEASE READ AND
FOLLOW THESE INSTRUCTIONS TO
AVOID PERSONAL INJURY OR DEATH:
When working on or around a vehicle, the following
general precautions should be observed at all times:
1. Park the vehicle on a level surface, apply the
parking brakes, and always block the wheels.
Always wear safety glasses.
2. Stop the engine and remove ignition key when
working under or around the vehicle. When
working in the engine compartment, the engine
should be shut off and the ignition key should
be removed. Where circumstances require that
the engine be in operation, EXTREME CAUTION
should be used to prevent personal injury resulting
from contact with moving, rotating, leaking, heated
or electrically charged components.
3. Do not attempt to install, remove, disassemble
or assemble a component until you have read
and thoroughly understand the recommended
procedures. Use only the proper tools and observe
all precautions pertaining to use of those tools.
4. If the work is being performed on the vehicle’s
air brake system, or any auxiliary pressurized air
systems, make certain to drain the air pressure
from all reservoirs before beginning ANY work
on the vehicle. If the vehicle is equipped with a
Bendix
®
AD‑IS
®
air dryer system or a dryer reservoir
module, be sure to drain the purge reservoir.
5. Following the vehicle manufacturer’s recommend‑
ed procedures, deactivate the electrical system in
a manner that safely removes all electrical power
from the vehicle.
6. Never exceed manufacturer’s recommended
pressures.
7. Never connect or disconnect a hose or line
containing pressure; it may whip. Never remove
a component or plug unless you are certain all
system pressure has been depleted.
8. Use only genuine Bendix
®
brand replacement parts,
components and kits. Replacement hardware,
tubing, hose, ttings, etc. must be of equivalent
size, type and strength as original equipment and
be designed specically for such applications and
systems.
9. Components with stripped threads or damaged
parts should be replaced rather than repaired. Do
not attempt repairs requiring machining or welding
unless specically stated and approved by the
vehicle and component manufacturer.
10. Prior to returning the vehicle to service, make
certain all components and systems are restored
to their proper operating condition.
11. For vehicles with Automatic Traction Control (ATC),
the ATC function must be disabled (ATC indicator
lamp should be ON) prior to performing any vehicle
maintenance where one or more wheels on a drive
axle are lifted off the ground and moving.
3
3. ANTILOCK BRAKE SYSTEM
(ABS) OPERATION
The Bendix® TABS‑6™ Adv MC module uses wheel speed
sensors,modulatorrelayvalves(MRVs);andanECUto
optimize the contact between the tires and the road surface
during a braking event where excessive wheel slip — or
wheel lock‑up — is detected.
When a situation is detected where the system needs
to intervene, the ECU will activate the MRVs to apply
controlledbrakepressureatthewheelends.Dependingon
thecongurationoftheABSsystem,interventionsmaybe
made on individual wheels, or pairs of wheels. In the case
of pairs of wheels, the wheels controlled by a modulator
may be either on the same side of the vehicle, or at both
ends of an axle.
TheTABS-6AdvMCmoduleECUisabletomodulatethe
brake pressure with greater speed and accuracy than a
driver.
Normal Braking
During normal braking the TABS-6Adv MC module
functionsasastandardrelayvalve.IftheECUdoesnot
detect excessive wheel slip, it will not activate the ABS
system, and the vehicle will stop with normal braking.
Side Control (Independent Control)
Side control uses a single modulator relay valve to sepa‑
rately control the braking on one or more wheels, on each
side of the vehicle.
In the case of braking surfaces with poor overall traction,
the side control ABS interventions will maintain the wheels
on each side of the vehicle independently, at just under the
speed where they would lock up.
Axle Control
Axle control uses a single modulator relay valve to control
the wheels at both ends of a given axle (or multiple axles
in cases where a single MRV is controlling several axles).
In the case of braking surfaces with poor overall traction
(e.g. roads that are worn, slippery, or are made of loose
gravel) — or braking surfaces with areas of poor traction
(e.g. asphalt roads with patches of ice) — axle control ABS
interventions will maintain the wheel that is not slipping at
just under the speed that will lock the wheel. The system
permits the other wheel (that is experiencing slippage)
temporary periods of wheel‑lock during the intervention.
Axle control should not be used on 5th wheel dollies or
steerable axles.
When intervening on regular traction road surfaces, a
systemconguredforaxlecontrol performs similar to a
side control, two‑modulator system.
ABS Fail‑Safe
The Bendix® TABS‑6™ Adv MC module is designed to react
inafail-safemannerintheeventofasystemDiagnostic
TroubleCode(DTC).Forexample,iftheECUdetectsthat
asensorisnotresponding,anABSsystemDTCwillbeset
and the TABS‑6 Adv MC module will illuminate the trailer
ABS indicator lamp and revert to a fail‑safe mode where
some, or all, Advanced ABS functions (including TRSP)
maynotfunction.EvenincaseswheretheABSsystem
is completely disabled, the standard pneumatic brake
function of the vehicle will still be available, but without the
benetsofABS.TheTRSPfeatureisalsodisabledwithan
active ABS system diagnostic code. If the indicator lamp
is illuminated, always have the ABS system serviced at the
earliest opportunity.
1
21
22
22
21
21
42
22
1/2" NPT Supply
Port 1
Two 3/8" NPT Delivery
Ports 22
(To Brake Chambers)
Two 3/8" NPT Delivery
Ports 21
(To Brake Chambers)
3/8" NPT Control Port
with Integral Filter
3/8" NPT Load Port 42
For Air Suspension
(Plugged for Non-Air Suspension or
Spring Suspension Sensor Vehicles)
3/8" NPT Delivery
Port 21
(to Brake Chambers)
3/8" NPT Delivery
Port 22
(to Brake Chambers)
FIGURE 2 ‑ PORTS USED
4
4. BENDIX® TRAILER ROLL STABILITY
PROGRAM (TRSP®) OPERATION
WARNING! During a Bendix® TRSP® system
intervention, the vehicle automatically decelerates.
The TABS‑6 Adv MC module can slow the vehicle with
or without the driver applying the brake pedal, and even
when the driver applies the throttle.
WARNING! Even with TRSP system‑equipped
vehicles, the driver remains responsible for ensuring
vehicle stability during operation. The TRSP system
only functions within the limits of physics. The system
can help mitigate potential vehicle stability incidents,
but cannot prevent them in all cases. Other factors —
such as driving too fast for the road, trafc or weather
conditions, over‑steering, an excessively high vehicle
Center of Gravity (CG), poor road conditions, or
insufcient vehicle maintenance — can cause vehicle
instability that is beyond the capability of any stability
system to mitigate.
WARNING! The TRSP system should only be used
on specic vehicle platforms that have been validated
and approved by BCVS engineering.
WARNING! The TRSP system is not approved for
use on combination vehicles (commonly referred to as
“doubles” or “triples”). The TABS‑6 Adv MC module
shall not be installed on towing trailers that can be used
for “double” or “triple” trailer applications (including
B‑trains).
WARNING! For vehicles installed with spring
suspension systems, care must be taken to prevent
damage to the load sensor when lifting the trailer. The
linkage rod must be disconnected from the sensor’s
rubber boot whenever the frame of the trailer is lifted,
dropping the axle(s). This includes situations where
a jack is used on the rear bumper or when a crane is
used to lift the trailer.
WARNING! Operating the vehicle with a damaged/
disconnected load sensor could lead to a serious
accident. The Bendix® Advanced Trailer ABS used on
this vehicle uses sensors, including the load sensor,
to assist the Trailer Roll Stability function.
The TRSP system reduces the risk of roll‑overs during
driving by automatic application of the service brakes when
the system detects potential rollover conditions. This is
accomplished with monitoring sensors both at the trailer
wheel‑ends and within the Bendix® TABS‑6™ Adv MC
module. The Bendix® TRSP® system reacts by applying the
trailer service brakes and slowing the vehicle combination.
The Bendix TRSP system uses the following sensors:
• Lateral Acceleration: A lateral accelerometer is
located within the Bendix TABS‑6 Adv MC module.
This sensor detects the lateral motion (or “roll”) of the
vehicle as it moves. The TABS‑6 Adv MC module
mustbemountedeitherfacingforward(0degrees)or
facingtherear(180degrees)ofthetrailertofunction
correctly — See Troubleshooting section for full details
of acceptable installation locations. Note: Do not
attempt to change the location of the module without
contacting Bendix for engineering approval.
• Vehicle Speed: The TRSP system obtains information
about the vehicle speed and rate of acceleration from
the wheel speed sensors.
• Axle/Bogie Load: The trailer’s axle load information
is obtained either by the use of:
(a) An integrated pressure sensor port (P42) of the
TABS‑6 Adv MC module, where a direct reading of
thesuspensionairspringpressureistaken;or
(b)If congured for a mechanical spring deection
sensor, a voltage reading that is proportional to the
springdeection.
TRSP Intervention with Driver Actions
Itisquitepossiblethatthedriverwillalsoapplythebrakes
before or during a TRSP intervention by the TABS‑6 Adv
MCmodule.Inallcases,theElectronicControlUnit(ECU)
monitors the driver’s brake application and compares that
to the amount of braking the TRSP program has calculated
needs to be applied. The pressure delivered to the brakes
will always be the higher of the two values.
5
5. COMPONENTS
Installations of the TABS‑6 Adv MC module use the
following components:
Internal:
• Electronic Control Unit (ECU): TheECUmonitors
the speed sensor signals, lateral accelerometer sensor
signalandvariouspressuresensors(andifcongured,
externalspringdeectionsensor)todeterminewhen
ABS and/or TRSP intervention is required.  When
needed, the ECU actuates the appropriate pressure
modulator valves to optimize the brake pressure. The
ECUmonitorsthesystemtodetectandwarnthedriver
ofanymalfunctions.DiagnosticTroubleCodes(DTCs)
arestoredintheECUandcanbereviewedtodiagnose
the TABS‑6 Adv MC module system.
• Lateral Accelerometer Sensor: The lateral accel‑
erometer sensor senses the lateral movement of the
trailer and sends an electrical signal directly propor‑
tionaltothetrailer’slateralaccelerationtotheECU.
• Supply Pressure Sensor: (non‑serviceable, and
located within the module.)
• Internal Load Sensor:
For air suspension systems, the load sensor port (P42)
mustbeplumbedtoaxedaxleairridebellows.Note:
the sensor must not be plumbed to a lift axle bellows
since they are not charged when the axle is not
being used. The function of this sensor is to monitor
the pressure and send an electrical signal directly
proportionaltothetrailer’saxleloadtotheECU.
• Brake Demand Pressure Sensor: This sensor
monitors the trailer service brake pressure being
applied by the driver and sends an electrical signal
directly proportional to the driver’s brake demand to
theECU.
• Brake Delivery Pressure Sensors: These sensors
(P21,P22)monitorthetrailerservicebrakepressure
that is being delivered to the wheel ends through, or
by, the TABS‑6 Adv MC module system and sends
electrical signals directly proportional to the delivered
trailerservicebrakepressuretotheECU.
• Modulator Relay Valve (MRV): MRVs are integrated
into the module and are controlled electrically by the
ECUtodecrease,hold,orallowthefullappliedbrake
pressure into the brake chamber to control the braking
torqueatthewheels.
External:
• Wheel Speed Sensors (WSS):Locatedatselected
hubs, wheel speed sensors detect the rotation of indi‑
vidualwheelsandsendanelectricalsignaltotheECU
proportional to the rotational velocity. See Figure 3.
• External Load Sensor:
For spring suspension systems, an external electrical
springdeectionsensorisinstalled—typicallyasclose
to the center (±5 inches) as possible of an axle with
linkage attached to the center of the axle (but MUST
NOT be installed on a lift axle), See Figure 4. Vehicles
with a mechanical load sensor have the port (P42) used
for sensing the air suspension system plugged.
Note: Do Not Use
Previous WSS
Clamping Sleeves
That Have “BW”
in a Diamond
90° Speed
Sensors
Straight Speed
Sensors
Sensor
Clamping
Sleeve
Acceptable
Logo-Stamped
Sleeves
FIGURE 3 ‑ BENDIX® WS-24™ WHEEL SPEED SENSORS
Load Sensor
Vertical Linkage Rod
Axle Attachment
Bracket
Axle Strap-Style
Fastener Clamp
Mounting
Bolts
Rubber
Link and
Rod
Adjustable Linkage
with Rubber Link
FIGURE 4
‑ TYPICAL
EXTERNAL
LOAD SENSOR
INSTALL ATION
• Trailer ABS Indicator Lamp: ControlledbytheECU
to show the ABS status, the trailer ABS indicator lamp
illuminateswhenaDiagnosticTroubleCode(DTC)is
active. See Figure 5. If there are no ABS diagnostic
trouble codes present, when ignition power is applied
totheECU,thelampwillilluminateasabulbcheck
lasting typically two (2), up to six (6) seconds at most.
FIGURE 5 ‑ TRAILER-MOUNTED ABS INDICATOR LAMP
6
• Pigtail Wiring Harness: A power pigtail harness is
required.Auxiliaryharnessesareavailable,asneeded.
See Figure 6.
• Lift Axle Sensing: Ifatrailerisequippedwithaliftaxle,
thenliftaxlesensingmustbeused,unlesscongured
for automatic lift axle control (see below). A pressure
threshold switch must be installed in the lift bag for the
liftaxleandconnectedtotheECU.TheECUcanthen
monitor the position of the lift axle and will compensate
correctly for the load transfer to the other axle(s) when
the lift axle is raised.
• Lift Axle Control: The Bendix® TABS‑6™ Adv MC can
be congured to automatically raise (and lower) lift
axle(s)whenapre-conguredloadissensed.
• Load Sensor: Ifatrailerisequippedwithanexternal
electrical spring deection sensor, See Figure 3, a
linkage is attached to an axle (but must not be installed
onaliftaxle)—within5(ve)inchesofthecenterof
the axle — connects to a load sensor attached to the
chassis of the vehicle. The output from the sensor is
an electrical signal that is proportional to the spring
Pigtail Harness
6-pin Auxiliary
Pigtail Harness
6-pin Auxiliary
12-Pin
ECU
Connector
12-Pin
ECU
Connector
12-Pin
ECU
Connector
12-Pin ECU Connector
12-Pin ECU Connector
4-Pin SAE J1939 (CAN)
(Diagnostic)
4-Pin SAE J1939 (CAN)
(Diagnostic)
4-Pin SAE J1939 (CAN)
(Diagnostic)
4-Pin Sensor
Harness
4-Pin Sensor
Harness
FIGURE 6 ‑ EXAMPLES OF PIGTAIL WIRE HARNESSES
To ECU To WS-24™ Wheel
Speed Sensor
Wheel Speed Sensor
Extension Harness
(6000365)
(Harness - K025594)
(Harness - K048988)
(Harness - K048989)
(Harness - K027758)
(Harness - K025593)
X1 Power Harness (K022146)
5-Pin Power and
Indicator
Lamp (POWER/
Indicator Lamp)
7-Pin ECU Connector
7
deection.Theconnection totheElectronic Control
Unit(ECU)isviatheauxiliary12-pinconnector.See
Figure 6.
6. MOUNTING
Frame (Chassis) Mount
The Bendix® TABS‑6™ Adv MC module provides three
M10,1.18in.(30mm.)studsforframemountingdirectly
to a trailer cross‑member. The TABS‑6 Adv MC module
usesthreeClass8steelM10x1.5nutswithlockwashers,
torquedto354±44.4in.-lbs(40±5Nm).Abracketmaybe
used if direct mounting to a cross‑member is not possible.
7. PIGTAIL WIRING HARNESSES
Several pigtail wire harnesses are available to connect
the TABS‑6 Adv MC module with other trailer system
components. See Figure 6. Pigtail harnesses are weather‑
sealed at the connector interface and are clearly labeled for
proper installation. Because of the over‑molded design of
the wiring harnesses, Bendix recommends that if damage
or corrosion occurs, the complete harness be replaced.
Wheel Speed Connectors
The TABS‑6 Adv MC module includes two primary and
two secondary wheel speed sensor connections separate
fromthemainvehiclepigtailharnesses,andeachrequires
a separate harness.
ECU Connectors
TheTABS-6AdvMCmoduleECUhastwoconnectors(in
addition to the wheel speed sensor connectors mentioned
above). The primary connector is a 7‑pin custom series
screw‑on type connector used to connect to the vehicle’s
power pigtail harness.  The other connector is a 12-pin
DeutschDTseriesstyleconnector,usedforauxiliaryinputs
andoutputs(I/Os).
POWER AND GROUND
Trailer electrical power is supplied to the TABS‑6 Adv MC
module from the ignition and brake light circuits.
See Charts 1 and 2 for output values and pin locations.
Function Mode Value
OperatingRange 8.0to32.0VDC
ECUActive 150mA@12VDC
ABS Active 2.0A@12VDC
CHART 1 – VALUES FOR OUTPUTS
Circuit
7‑Pin
Trailer
Conn.
5‑Pin
ABS
Conn.
7‑Pin
ECU
Conn.
IgnitionPowerPLC
(Blue Wire) 7B1
BrakeLightPower
(Red Wire) 4 A 2
Ground
(White Wire) 1E4
IndicatorLamp
(White/Green Wire) N/A D 5
CHART 2 – POWER AND GROUND
Power/ABS Indicator Lamp Connector
The TABS‑6 Adv MC module pigtail uses a TTMA RP 97‑99
5‑pin Packard Weather Pack connector for brake light
power, constant power, ground and the trailer‑mounted
ABS indicator lamp.
SAE J1939 (CAN) Connector
See Figure 6.
TABS-6Adv MC module 12-pin auxiliary harnesses
typicallyincludea4-pinconnectorusedforvariousECU
communications.TypicalusesincludeJ1939diagnostics,
and connection to the Bendix® Trailer Information Module.
Auxiliary I/O Connector
The TABS-6Adv MC module 12-pin auxiliary harness
providesanoptionforuptothreeauxiliaryI/Os.
Examplesofusesoftheauxiliaryconnectorare:
• Liftaxlesensing.
• Rear axle suspension air bag dump.
• SAEJ1939Diagnostics.
• Automatic lift axle control.
• Externalspringdeectionsensorformechanicalspring
suspensions.
8
CAUTION: Correct wheel speed sensor installation is
necessary for optimal ABS operation.
NOTE:Ifthetrailerisequippedwithaliftaxlethatwilluse
wheel speed sensors, it is important that secondary sensors
SEandSFbeusedforthisaxle.Seethesystemdiagrams
included in this document. In all cases, the primary wheel
speed sensors must be located on the xed axle.  For
2S/2Msystems,thexedaxlesensorsareSCandSD.
1. ForincreasedcorrosionprotectionBendixrecommends
that a high‑temperature rated silicon‑ or lithium‑based
grease be applied to the interior of the mounting block,
the sensor, and to a new clamping sleeve.
2. Install the new clamping sleeve fully into the block,
with the retaining tabs toward the inside of the vehicle.
Please note that Bendix WS‑24 wheel speed sensors
must use the correct clamping sleeve to avoid problems
associated with reduced retention force, such as sensor
movement and resulting ABS trouble codes. See
Figure 4.
3. Gently push (DO NOT STRIKE) the sensor into the
mounting block hole until it bottoms out on the face of
the tone ring. Secure the cable lead wire to the knuckle/
axlehousing3-6inchesfromthesensor.
4. Apply a moderate amount of dielectric non‑conductive
grease to both the sensor and harness connectors.
5. Engagetheconnectors,andpushthemtogetheruntil
the lock tab snaps into place. It is permissible to use an
extrawireretainer(partnumber300122,orequivalent),
if available, to hold the connectors together.
ThefrictiontallowstheWS-24sensortoslidebackand
forth under force, but to retain its position when the force
is removed. When the WS‑24 sensor is inserted all the
way into the mounting block and the wheel is installed on
the axle, the hub exciter contacts the sensor, which pushes
the sensor back. Also, normal bearing play will “bump” the
sensor away from the exciter. The combination of these
two actions will establish a running clearance, or air gap,
between the sensor and exciter.
CAUTION: Wheel bearing maintenance is an important
part of keeping the wheel speed sensors in the correct
position. Excessive wheel end play can result in DTCs
in cases where the sensor is pushed too far away
from the tone ring for a good signal to be produced.
Maintain wheel bearings per the manufacturer's
recommendations.
8. ABS INDICATOR LAMP
Trailer‑mounted Lamp
The Bendix® TABS‑6™ Adv MC module controls an ABS
indicator lamp to show the trailer ABS status. With power
supplied by the towing vehicle — if there is an active
DiagnosticTroubleCode(DTC),orduringthebulbtestat
start‑up — the module illuminates the ABS indicator lamp
byproviding a12.0VDC signal.(Theotherside ofthe
lamp is grounded.) The ABS indicator lamp output uses
pin 5 of the 7‑pin connector on the module.
Dash‑mounted Lamp (PLC Controlled)
TABS-6Adv MC modules use SAE J2497 standards to
support Power Line Carrier (PLC) communication.  The
status of the trailer ABS is transmitted over the ignition
powerwire(thebluewireoftheJ560connector)—pin1
of the 7‑pin module connector.
IfthereisanactiveDTC,duringthebulbcheckatstart-up,
the TABS‑6 Adv MC module will transmit a signal over
thepowerlinetothetowingvehicle’sECU.Thetowing
vehicle’s ABS controller will then illuminate the trailer ABS
indicator lamp mounted on the dash.
9. BENDIX® WS‑24™ WHEEL
SPEED SENSORS
See Figure 4. Wheel speed data is provided to the TABS‑6
Adv MC module by the Bendix® WS‑24™ wheel speed
sensors. Typically, the WS‑24 wheel speed sensor is
installed in a mounting block that is welded to the axle
housing. The WS‑24 wheel speed sensors are protected
by a stainless steel sheath. They are designed to be
used with beryllium copper clamping sleeves (sometimes
referred to as a “retainer bushing”, “friction sleeve”, or “clip”)
(See Figure 4).Theclampingsleeveprovidesafrictiont
between the mounting block bore and the WS‑24 sensor.
Vehicles have an exciter ring (or “tone ring”) as part
of the wheel assembly. (The default setting expects a
100-toothtoneringtobeused.See Section 17 for more
information.) As the wheel turns, the teeth of the exciter
ring pass the wheel speed sensor, generating an AC signal
whichisdeliveredtotheTABS-6AdvMCmoduleECU.
Thesignalvariesinvoltageandfrequencyasthewheel
speed changes.
Vehicle axle andABS control congurations determine
if two, or four, wheel speed sensors are required.  See
Figures 20 and 21 for an electrical system schematic
showing wheel speed sensor connector pin locations.
9
10. SAE J2497 (PLC) DIAGNOSTIC LINK
All newer towed vehicles transmit a signal over the power
linetothetowingvehicleABSECU.Thesignal,usinga
heavy vehicle industry standard known as Power Line
Carrier(PLC\J2497),isbroadcastbythetrailerABSECU
overthebluewire(ignitionpowerline)oftheSAEJ560
connector and controls an in‑cab trailer ABS indicator lamp.
See Figures 7 and 8.
FIGURE 7 - POWER LINE WITHOUT PLC SIGNAL
FIGURE 8 - POWER LINE WITH PLC SIGNAL
The Bendix® TABS‑6™ Adv MC module provides a data link
forPLCcommunicationfollowingtheSAEJ2497standard.
Bendix® ACom® diagnostics software (version 6.1 and
higher) and the Bendix® Trailer Remote Diagnostic Unit
(TRDU™) both support PLC communication with the
TABS‑6 Adv MC module.
PLC communication is applicable for 12-volt vehicle
applicationsonly.ThePLCcommunicationisdisabledfor
voltagesgreaterthan18volts.
Identifying and Measuring the PLC Signal
ATABS-6AdvMCmodulewillcontinuouslybroadcastPLC
messages that indicate trailer ABS status. At power‑up,
or during a trailerABS diagnostic Trouble Code (DTC)
condition, the TABS‑6 Adv MC module will signal the
tractor ABS unit to illuminate the dash‑mounted trailer ABS
indicator lamp.
Diagnostic tools are available that detect the presence
ofaPLC signalandperform further systemdiagnostics
directly, using the power line. For more information on
these diagnostic tools, contact Bendix or refer to your local
authorized Bendix dealer or distributor.
An oscilloscope can also be used to verify the presence
andstrengthofaPLCsignalonthepowerline.ThePLC
signal is an amplitude and frequency modulated signal.
Dependingontheloadonthepowerline,theamplitude
ofthePLCsignalcanrangefrom2.5mVp-pto7.0Vp-p.
Suggestedoscilloscopesettingsare(ACcoupling,1volt/
div,100µsec/div).Thesignalshouldbemeasuredonpin7
oftheJ560connectoratthenoseofthetrailer.
11. SAE J1939 (CAN) DIAGNOSTIC LINK
The TABS‑6 Adv MC module provides a data link for
transmitting CAN information following the SAE J1939
standard.
Bendix® ACom® diagnostics software (version 6.1 and
higher) and the Bendix® Trailer Information Module both
support CAN communication with theTABS-6Adv MC
module.
Ignition power must be provided to the TABS‑6 Adv MC
module for the diagnostic link to be active.
12. AUXILIARY I/O
The TABS‑6 Adv MC module provides for up to six auxiliary
input/output(I/O)functions.See Chart 3.
Name
12-Pin
ECU
Conn.
(X2)
Auxiliary Functions Auxiliary
Type
AuxI/O1
(AuxIO1) 1
High-SideDriver Output
DigitalInput Input
AuxI/O2
(AuxIO2) 2
High-SideDriver Output
DigitalInput Input
AuxI/O3
(AuxIO3) 3
High-SideDriver Output
DigitalInput Input
AuxRet12 11 Low-SideDriver Output
AuxRet3 12 Low-SideDriver Output
Sens_Sup 4 +5V Sensor Supply Output
Sens_In 5 Analog Input Input
Sens_Gnd 6Low-SideDriver Input
CHART 3 – AUXILIARY I/OS
Bendix® ACom® diagnostic software (version 6.1 and
higher)supportsthecongurationoftheTABS-6AdvMC
moduleauxiliaryI/Os.
10
13. BENDIX® ABS FLEX™ PROGRAM
The BendixABS Flex program usesAuxiliary Design
Language(ADL)toallowcustomizedauxiliaryfunctionsto
be carried out by the Bendix® TABS‑6™ Adv MC module.
Programs developed in the ABS Flex program may be
downloadedattheproductionline,orintheeld,tocontrol
non‑braking functions of the trailer.
For example, the ABS Flex program can potentially com‑
municatethe statusof:tireinationand/ortemperature;
reefertemperature;loadpresence;sliderpinposition;lift
axleposition;proximity/reversealarm;andvehicleweight.
ABS Flex programs monitor the auxiliary I/Os and/or
theSAEJ1939(CAN)andSAEJ2497(PLC)datalinks.
Contact your Bendix Account Manager to discuss an ABS
Flex program for your vehicle(s).
14. CUSTOMER SCRATCH PAD
The TABS‑6 Adv MC module has a Customer Scratch Pad
feature which allows the customer, or end‑user, to store up
to1,008bytesofinformation.Thisinformationcanthenbe
read using the Bendix® ACom® diagnostic software (version
6.1andhigher).
15. POWER‑UP SEQUENCE
At power‑up, the TABS‑6 Adv MC module performs a series
of self‑checks that can assist a technician to determine the
ABSsystemstatusandconguration.
Trailer ABS Indicator Lamp
Atpower-up,withnodetectedDiagnosticTroubleCodes
(DTCs),thetrailerABS indicator lamp will illuminatefor
approximately two (2) to six (6) seconds as a bulb check
and then turn off. See Figure 9.
If any active ABS‑ or TRSP‑related diagnostic codes
are present, the trailer ABS indicator lamp will remain
illuminated.
For non-ABS or TRSP-related DTCs, such as auxiliary
functions, at power‑up the trailer ABS indicator lamp will
turn on for approximately six and a half (6.5) seconds as
an extended bulb check and then turn off.
IfaPLC-readytowingvehicleandtrailerarepoweredatthe
same time, the TABS‑6 Adv MC module will also trigger a
bulb check on the dash‑mounted trailer ABS indicator lamp.
Modulator Chuff Test at Power‑Up
At power‑up, the TABS‑6 Adv MC module activates a
modulator chuff test. This electrical and pneumatic ABS
modulator test can help the technician identify problems
with modulator installations and/or wiring.
With brake pressure applied, a properly installed modulator
will cause two rapid audible chuffs of air pressure. The
TABS‑6 Adv MC module will not perform a modulator chuff
testwithanactiveABSDTC.
*Some vehicle manufacturers may illuminate the trailer ABS
indicator lamp at power-up regardless of whether a PLC
signal is detected from the trailer or not. Consult the vehicle
manufacturer’s documentation for more details.
Power
Application
Dash-mountedTrailer
ABSIndicatorLamp
(PLCDetected)*
Dash-mountedTrailer
ABSIndicatorLamp
(PLCNotDetected)
Trailer‑mounted ABS
IndicatorLamp
ABS System
Status Indicators
ON
OFF
1.0
ON
OFF
3.0 4.0 5.02.0
ON
OFF
6.0 (sec.)
FIGURE 9 ‑ TRAILER ABS LAMP POWER-UP SEQUENCE
16. ODOMETER FUNCTION
Odometer
The TABS‑6 Adv MC module includes an odometer function
to provide a means of storing the accumulated mileage of
the vehicle. The mileage is computed by using information
received from the vehicle wheel speeds sensors.
Thisfeatureis accuratetowithin 0.62 milesperpower-
upandwilltypicallystoremileageupto1,000,000miles.
The mileage can be displayed using PC diagnostics, a
Bendix® Trailer Information Module, Bendix® Trailer Remote
DiagnosticUnit(TRDU™), or through blink codes.
Whenever the TABS‑6 Adv MC module is towed using
a pre-1997 tractor (with no constant power supplied to
the trailer), no information about mileage will be stored
during that time, and the mileage can be considered out‑
of‑calibration.
Trip Counter
The TABS‑6 Adv MC module provides a counter to record
the trip mileage. The feature can be accessed using PC
DiagnosticsortheBendix® Trailer Information Module.
Service Interval
The TABS‑6 Adv MC module provides a feature that can
be used to indicate a service interval for the trailer. The
service interval can be accessed using PC diagnostics or
theTrailerInformationModule.Ifcongured,theTABS-6
Adv MC module can ash the indicator lamp when the
vehicle is at standstill to indicate when the service interval
has been exceeded.
11
17. NON‑STANDARD TIRE SIZE
The Bendix® TABS‑6™ Adv MC module allows for tire rolling
radius and tone ring tooth count parameters to be set for
the axle being sensed using the Bendix® ACom® diagnostic
software. These adjustments may be necessary for the
module to accurately calculate the vehicle velocity and
odometer mileage. Wheels of the same axle must have,
and be set to the same, rolling radius and tone ring tooth
count.Referto the manufacturer’stire specication for
correct values.
Thetoneringsizeisdefaultedto100teeth,andthetire-
rollingradiusisdefaultedto511revolutionspermile.These
parameters can be adjusted as shown in Chart 4.
Tone Ring
Size
Tire Rolling Radius –
Allowable Range
60teeth 712to1005rpms
80teeth 512to801rpms
90teeth 456to711rpms
100teeth 410to640rpms
120teeth 356to502rpms
CHART 4 – TONE RING SIZE TO TIRE ROLLING RADIUS
18. DIAGNOSTIC TROUBLE
CODE DETECTION
The TABS‑6 Adv MC module contains self‑testing
diagnostic circuitry that monitors the ABS components
and wiring.
When the TABS‑6 Adv MC module senses an erroneous
system condition, it activates the external trailer‑mounted
ABS indicator lamp; disables all or part of the affected
ABSand/orTRSPfunctions;anditstorestheDiagnostic
TroubleCode(DTC)inmemory,sothattheinformationis
retained even when the power is removed. The TABS‑6
AdvMCmodulealsousesPLCcommunicationstosend
the system status to the towing vehicle.
For some trouble codes, the TABS‑6 Adv MC module will
automaticallyreset(“self-heal”)theactiveDTCwhenthe
error is corrected (e.g. when a wheel speed sensor is re‑
aligned).However,repeatedoccurrencesofagivenDTC
can cause the code to “latch” — that is, be retained as
active—eveniftheconditionisonlyintermittent.Once
the code is latched, a manual reset will be necessary.
Technicians can use these latched codes to assist them
in troubleshooting intermittent errors. After the problem
is repaired, the DTC can be reset using blink code
diagnostics, or with a diagnostic tool.
When a DTC self-heals or is manually reset, the code
remainsstoredasaninactiveDTCintheECUmemory.
This inactive DTC can be retrieved using blink code
diagnostics or with a diagnostic tool.
19. PARTIAL ABS SHUTDOWN
Depending on the DTC detected, theABS ECU will
partially or completely disable the ABS and/or Bendix®
TRSP® functionality. In cases where the ABS is completely
disabled, the vehicle reverts to normal braking (without
ABSorTRSPinterventions).AlwaysrepairABSDTCsat
the earliest opportunity.
ECU Diagnostic Trouble Codes
All ABS functions are completely disabled. The system
reverts to normal braking.
Voltage Diagnostic Trouble Code
Theoperatingvoltagerangeis 8.0 to 32.0 VDC.Ifthe
voltage is detected as being out of range, the ABS and
TRSP system braking features will be disabled, and the
system reverts to normal braking. When the correct voltage
level is restored, full ABS and TRSP is typically available
again.
20. BLINK CODE DIAGNOSTICS
The TABS‑6 Adv MC module provides diagnostic functions
through blink code diagnostics. This means that the
technician — even without diagnostic tools — can read a
seriesofABSindicatorlampblinkstodiagnosetheDTCs
being generated.
With no towing vehicle attached, enter the blink code
diagnostics mode by providing constant power to the
ignition circuit and then toggling the brake light power
inputthespecicnumberoftimesshowninChart5,for
the desired mode.
With a parked towing vehicle attached, apply ignition power,
andafterthepower-upsequenceiscomplete,enterthe
diagnostics mode by depressing and releasing the brake
pedalthespecicnumberoftimesshowninChart5,for
the desired mode.
CyclestoEnterDesiredMode
Mode Cycles
ActiveDTCRetrieval 3
InactiveDTCRetrieval(DTCHistory) 4
ClearActiveDTCs 5
OdometerMileageDisplay 7
CHART 5 – BLINK CODE INFORMATION
Dependingontheblinkcodemodeactivated,theTABS-6
Adv MC module will blink the trailer‑mounted ABS indicator
lamp to display: active DTC codes; inactive DTCs; and
odometer mileage. Blink code diagnostics can also be
usedtoclearactiveDTCs.
12
Wait until after the modulator chuff test before activating
thebrakelightpower.Alternatively,waitve(5)seconds.
Note: If certain Diagnostic Trouble Codes (DTCs) are set,
typically where modulator DTCs have occurred, the chuff
test may not run.
Following a single display of all available messages, the
ABSindicatorlampwillremainonforvesecondsandthen
return to normal operating mode. Blink code diagnostics
can only be activated following a power‑up, where wheel
speeds have not been detected. If the vehicle moves during
the blink code diagnostics mode, the Bendix® TABS‑6™ Adv
MC module will cancel the blink code diagnostics and return
to normal operating mode.
Blinkcodediagnosticsmustbeactivatedwithintherst15
seconds of ignition power being applied.
If brake light power is continuously applied for greater than
veseconds,blinkcodediagnosticswillbedisableduntil
the next time the ignition power is cycled.
Display Active Diagnostic Trouble Codes (DTCs)
To display active codes, apply ignition power and depress
and release the brake pedal three (3) times within 15
seconds (allowing one second between each application).
Following this activation, there will be a ve (5) second
delay followed by a blink code display sequence of all
active DTCs.  (See pages 13-19 for more information
aboutDTCs.)
Display Inactive Diagnostic
Trouble Codes (DTCs)
TodisplayinactiveDTCs—thosethatarenotcurrentlyset,
buthaveoccurredandarestoredintheECUsmemory—
apply ignition power and depress and release the brake
pedal four (4) times within 15 seconds. Following this
activation,therewillbeave(5)seconddelayfollowedby
ablinkcodedisplaysequenceofallinactiveDTCsstored.
(Seepages13-19formoreinformation.)
Reset Active Diagnostic Trouble Codes
To reset active codes, apply ignition power and depress and
releasethebrakepedalve(5)timeswithin15seconds.
Followingactivation,therewillbeave(5)seconddelay
followed by:
(a)If no DTCs remain, a blink code message of 1-1,
(SystemFullyOperational-NoDTCsDetected)and
theABSindicatorlampwillceasetobeilluminated;or
(b)IfthereareremainingactiveDTCs,asequenceofblink
codeswilldisplayalloftheremainingactiveDTCs,and
the ABS indicator lamp will stay on.
Resettingactive DTCswithblinkcode diagnosticsdoes
not clear information from trouble code history. Both blink
code diagnostics or diagnostic tools can retrieve inactive
DTCs,butonlydiagnostictoolscanclearthisinformation.
Display Odometer Mileage
To display the trailer odometer mileage, apply ignition
power and depress / release the brake pedal seven (7)
timeswithin15seconds.Followingactivation,therewill
beave(5)seconddelayfollowedbyablinkcodedisplay
oftheodometerinformation(x1000).
Example:152,431mileswillbedisplayedas:152(x1000)
or1blink(pause);5blinks(pause);2blinks.
Zeros will be displayed by the ABS indicator lamp strobing
twice.
Odometer mileage cannot be altered with blink code
diagnostics. Complete odometer information can be
retrieved using a diagnostic tool.
21. AUXILIARY FEATURES
Rear Axle Suspension Dump
Somespread-axletrailersareequippedwitharear-axle
suspension air bag dump feature to assist with cornering
at low speeds. The TABS‑6 Adv MC module may be
conguredtousethisfeature.Whenthisfeatureisused
belowapre-determinedthresholdvehiclespeed,theECU
will partially exhaust the rear axle air suspension bags, and
thenre-inatethemwhenthevehiclespeedrisesabove
the threshold. For more information about this feature,
contact your local Bendix Account Manager by calling
1-800-AIR-BRAKE(1-800-247-2725).
Lift Axle Control (Automatic)
The TABS‑6™ Adv MC module can be configured to
automatically raise a lift axle when the load on the trailer
dropsbelowaconguredlevel.Changestothetrailerto
allow for this feature include the use of one of the auxiliary
outputs to operate a lift axle control valve.
13
22. DIAGNOSTIC TROUBLE CODES (DTCS)
1st
Digit
2nd
Digit
Diagnostic Code
Description Possible Causes / Repair Information
J1587
(SID/
FMI)
J1939
(SPN/
FMI)
1 1 Nodiagnosticcodes • The Bendix® TABS‑6™ Adv MC module system is fully operational –
no diagnostic codes are detected. 000/00 000/00
WheelSpeedSensors(WSS);“S-C”,“S-D”,“S-E”,“S-F”
21LargeAirGap:
Sensor “S‑C”
DynamicWheelSpeedSensorDTC-largeairgapbetweensensor
and tone ring.
GotoSectionEonPage38.
001/00 789/00
3 1 LargeAirGap:
Sensor“S-D” 002/00 790/00
41LargeAirGap:
Sensor“S-E” 003/00 791/00
51LargeAirGap:
Sensor “S‑F” 004/00 792/00
2 2
Shorted or open
wire:
Sensor “S‑C”
StaticWheelSpeedSensorDTC-shortedoropensensorwire.
GotoSectionEonPage38.
001/03
001/04
789/03
789/04
32
Shorted or open
wire:
Sensor“S-D”
002/03
002/04
790/03
790/04
4 2
Shorted or open
wire:
Sensor“S-E”
003/03
003/04
791/03
791/04
5 2
Shorted or open
wire:
Sensor “S‑F”
004/03
004/04
792/03
792/04
23DynamicIssue:
Sensor “S‑C”
DynamicWheelSpeedSensorDTC-incorrectwheelspeedsignal
detected while vehicle is in motion.
GotoSectionEonPage38.
001/08
001/01
001/02
789/08
789/01
789/02
3 3 DynamicIssue:
Sensor“S-D”
002/08
002/01
002/02
790/08
790/01
790/02
43DynamicIssue:
Sensor“S-E”
003/08
003/01
003/02
791/08
791/01
791/02
53DynamicIssue:
Sensor “S‑F”
004/08
004/01
004/02
792/08
792/01
792/02
2 4
TireDiameterOutof
Range:
Sensor “S‑C”
• Verify the correct tire size as desired.
•Verifythepropertireination.
• Verify the correct number of exciter/tone ring teeth.
•VerifythattheTABS-6AdvMCmoduleECUhasbeenprogrammed
with the correct tire size and tone ring settings.
001/13 789/13
34
TireDiameterOutof
Range:
Sensor“S-D”
002/13 790/13
4 4
TireDiameterOutof
Range:
Sensor“S-E”
003/13 791/13
5 4
TireDiameterOutof
Range:
Sensor “S‑F”
004/13 792/13
14
1st
Digit
2nd
Digit
Diagnostic Code
Description Possible Causes / Repair Information
J1587
(SID/
FMI)
J1939
(SPN/
FMI)
Trailer Power
61 Over-voltage PowerSupplyDTC-trailerpowerabove32volts.
GotoSectionDonPage37. 251/03 3597/03
6 2 Low-voltage PowerSupplyDTC-trailerpowerbelow8volts.
GotoSectionDonPage37. 251/04 3597/04
63Excessivepower
line resistance
PowerSupplyDTC-possiblecorrodedorshortedtrailerpowercircuit.
GotoSectionDonPage37. 251/13 3597/13
PressureSensors(Internal):“P4”,“P42”,&“P21”,"P22"&"P1"
71
Internal Pressure
Sensor Range:
Control Port “P4”
•Verifythetrailer’scontrol(service)pressureis<130psi.
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the Bendix® TABS‑6™ Adv MC
module.
077/12 1067/12
7 2
Internal Pressure
Sensor Range:
LoadPort“P42”
•Seethesuspensionmanufacturer’sspecicationsforloadversus
pressure.Verifythatthetrailer’sairsuspensionpressureis<130psi
andiswithintheallowablerangeforthespecicsuspension/airbag
combination.[below50%ofairbagpressureattheunladenweight,or
above50%ofairbagpressureatGVWRforaxles]
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact the BCVS local representative
before replacing the TABS‑6 Adv MC module.
069/12 1059/12
73
Internal Pressure
Sensor Range:
DeliveryPort“P21”
• Perform a Pressure Component Test using the Bendix® ACom®
diagnosticsoftware(version6.1orhigher).
• Verify the trailer’s control (service) and brake delivery pressures are
comparableand<130psi.
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
059/12 1049/12
7 4
Internal Pressure
Sensor Range:
DeliveryPort“P22”
062/12 1052/12
7 5
Internal Pressure
Sensor Range:
SupplyPort“P1”
•Verifythetrailer’sservicereservoirpressureis<123psi
(8.5bar).
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
151/12 1086/12
LateralAccelerationSensor
8 1
LateralAcceleration
Sensor ‑ Signal
MountingError
• Before troubleshooting, verify that the trailer has been parked on
level ground.
•VerifythattheTABS-6AdvancedMCECUhasbeenprogrammed
withtheproperECUorientation,tiresizeandtoneringsettings.
• Verify that the TABS‑6 Advanced MC module has been mounted as
per the Installation Guidelines:
-TheconguredECUorientationmatchestheactualECU
orientation.
‑ Verify that all wheel speed sensors are installed correctly
(correct axle/left/right) (See Figure 19)
• After repairs or if no issues are found, then clear the diagnostic
codes.
• If diagnostic code persists, contact the BCVS local representative
before replacing the TABS‑6 Advanced MC module.
099/14 1809/14
Diagnostic Trouble Codes (DTCs) (continued)
15
Diagnostic Trouble Codes (DTCs) (continued)
1st
Digit
2nd
Digit
Diagnostic Code
Description Possible Causes / Repair Information
J1587
(SID/
FMI)
J1939
(SPN/
FMI)
82
LateralAcceleration
Sensor-SignalOut
OfRange
• Before troubleshooting, verify that the trailer has been parked on
level ground.
• Verify that the TABS‑6 Adv MC module has been mounted as per the
Installation Guidelines.
•PerformaLateralAccelerationSensor(installationangle)Component
Test using the Bendix® ACom®diagnosticsoftware(version6.1or
higher), and verify that the roll angle of the TABS‑6 Adv MC module
iswithin±5°asmeasuredfromaathorizontalplane.
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
099/14 1809/14
8 3
InternalLateral
Acceleration Sensor
-OffsetError
• Before troubleshooting, verify that the trailer has been parked on
level ground.
• Verify that the TABS‑6 Adv MC module has been mounted as per the
Installation Guidelines.
•PerformaLateralAccelerationSensor(installationangle)Component
Test using the Bendix® ACom®diagnosticsoftware(version6.1or
higher).
VerifytherollangleoftheTABS-6AdvMCmoduleiswithin±5°as
measuredfromaathorizontalplane.
Iftherollangleisoutoftolerance,clearthediagnosticcodeand
test drive the vehicle.
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
099/02 1809/02
84
LateralAcceleration
Sensor ‑ Sensor
SignalNotFound
• Verify that the TABS‑6 Adv MC module has been mounted as per the
Installation Guidelines:
TABS-6AdvMCmodulemountedeitherin0°or180°orientation.
•IftheECUhasbeenconguredforanexternallateralacceleration
sensor:
Checkforcorroded/damagedwiringorconnectorsbetweenthe
ECUandtheexternallateralaccelerationsensor.
VerifycorrectwiringbetweentheECUandtheexternallateral
acceleration sensor.
099/14 1809/14
85
ExternalLateral
Acceleration Sensor
SignalNotAvailable
•Checkforcorroded/damagedwiringorconnectorsbetweentheECU
and the external lateral acceleration sensor.
•VerifycorrectwiringbetweentheECUandtheexternallateral
acceleration sensor.
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the Bendix® TABS‑6™ Adv MC
module.
099/14 1809/14
16
Diagnostic Trouble Codes (DTCs) (continued)
1st
Digit
2nd
Digit
Diagnostic Code
Description Possible Causes / Repair Information
J1587
(SID/
FMI)
J1939
(SPN/
FMI)
Trailer System Braking
91
Valve Plausibility
Error-Extended
Brake Application
• Verify that there is no residual pressure in the trailer’s control
(service) line.
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
057/07 1047/07
9 2
ABS Plausibility
Error-Excessive
ABS Activity
•Checkforcorroded/damagedwiringorconnectorsbetweentheECU
and the WSS.
• Check the air gap between the sensor and tone ring, pushing‑in
sensor(s) if needed.
•Rotatethewheelandverifyamin.of0.25VACsensoroutput@~
0.5RPS.
• Verify the condition of the sensor head.
• Verify the condition and retention power of the clamping sleeve.
• Verify the proper mounting of the exciter ring and condition of the
teeth.
• Check the wheel bearings for correct adjustment.
• Verify the sensor wire routing and clamping.
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
057/07 1047/07
93
TRSP Plausibility
Error-Excessive
TRSP Activity
• Clear the diagnostic codes.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
057/07 1047/07
17
1st
Digit
2nd
Digit
Diagnostic Code
Description Possible Causes / Repair Information
J1587
(SID/
FMI)
J1939
(SPN/
FMI)
TABS‑6 Adv MC module
10 1 TABS‑6 Adv MC
InternalError
• Check for damaged or corroded connectors.
• Check for damaged wiring.
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the Bendix® TABS‑6™ Adv MC
module.
254/12 629/12
10 2TABS‑6 Adv MC
CongurationError
•VerifytheECUparametersandactualsysteminstallationare
compatible using the Bendix® ACom®diagnosticsoftware(version6.1
or higher).
•Re-programtheECUasnecessary.
• If necessary, contact your local Bendix representative to obtain the
correctcongurationdata.
254/13 629/13
10 3 TABS‑6 Adv MC
EEPROMError
•VerifytheECUparametersandactualsysteminstallationare
compatible using the Bendix® ACom®diagnosticsoftware(version6.1
or higher).
•Re-programtheECUasnecessary.
• If necessary, contact your local Bendix representative to obtain the
correctcongurationdata.
254/13 629/13
10 4
TABS-6AdvMCNot
Congured
•Re-programtheECUtobecompatibletotheactualsystem
congurationusingtheBendix® ACom® diagnostic software (version
6.1orhigher).
• If necessary, contact your local Bendix representative to obtain the
correctcongurationdata.
254/13 629/13
10 5
TABS‑6 Adv MC
EOLTestNot
Completed
• Perform the Installation Test using the Bendix® ACom® diagnostic
software(version6.1orhigher),orBendix® Trailer Information
Module.
254/14 629/14
Diagnostic Trouble Codes (DTCs) (continued)
18
1st
Digit
2nd
Digit
Diagnostic Code
Description Possible Causes / Repair Information
J1587
(SID/
FMI)
J1939
(SPN/
FMI)
AuxiliaryDesignLanguage(ADL)&AuxiliaryI/Os
11 1AuxiliaryI/OError–
AUXWL(#7)
•Checkforcorroded/damagedwiringorconnectorsbetweentheECU
andABSIndicatorLamp.
•CheckpinX1-5oftheECU‘Power’connectorforthefollowing:
– Pin not pushed back.
–CorrectlywiredtotheABSIndicatorLamp(PinX1-5–supply)
– Shorted to ground, VbatorotherECUpins.
•VerifytheABSIndicatorLampisproperlygroundedandnotburnt
out.
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
152/12 612/12
11 2AuxiliaryI/OError–
AUXI/O#1
•Checkforcorroded/damagedwiringorconnectorsbetweentheECU
and the auxiliary device.
•CheckPinsX2-1&X2-11oftheECU‘In-Out’(I/O)connectorforthe
following:
Pinsnotpushedback.
Correctlywiredtotheauxiliarydevice(PinX2-1–supply,pinX2-11
– ground)
Shortedtoground,VbatorotherECUpins.
• Verify the auxiliary device is properly functioning and rated for
maximumloadof≤2amps.
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the Bendix® TABS‑6™ Adv MC
module.
152/12 612/12
11 3AuxiliaryI/OError–
AUXI/O#2
•Checkforcorroded/damagedwiringorconnectorsbetweentheECU
and the auxiliary device.
•CheckPinsX2-2&X2-11oftheECU‘In-Out’connectorforthe
following:
Pinsnotpushedback.
Correctlywiredtotheauxiliarydevice(PinX2-2–supply,
PinX2-11–ground)
Shortedtoground,VbatorotherECUpins.
• Verify the auxiliary device is properly functioning and rated for
maximumloadof≤2amps.
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
152/12 612/12
11 6AuxiliaryI/OError–
AUXI/O#3
•Checkforcorroded/damagedwiringorconnectorsbetweentheECU
and the auxiliary device.
•CheckPinsX2-3&X2-12oftheECU‘In-Out’connectorforthe
following:
Pinsnotpushedback.
Correctlywiredtotheauxiliarydevice(PinX2-3–supply,pinX2-12
– ground)
Shortedtoground,VbatorotherECUpins.
• Verify the auxiliary device is properly functioning and rated for
maximumloadof≤1.5amps.
• After repairs — or if no issues are found — clear the diagnostic code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
152/12 612/12
Diagnostic Trouble Codes (DTCs) (continued)
19
1st
Digit
2nd
Digit
Diagnostic Code
Description Possible Causes / Repair Information
J1587
(SID/
FMI)
J1939
(SPN/
FMI)
11 8AuxiliaryElectrical
Error#4
• Clear diagnostic codes.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
152/12 612/12
11 9
Auxiliary Program
Error–ADL
•VerifythattheAuxiliaryI/OECUpin-outsmatchtheADLparameters
using the Bendix® ACom®diagnosticsoftware(version6.1orhigher).
• If necessary, contact your local Bendix representative to troubleshoot
theADLprogram.
152/12 612/12
11 10 LowSupply
Pressure
• Check if the trailer’s service reservoir pressure is < 75 psi
(5.2 bar).
• If the trailer’s service reservoir pressure is > 75 psi (5.2 bar):
CycleIgnitionpower“OFF”and“ON”.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the Bendix® TABS‑6™ Adv MC
module.
152/01 612/01
11 11 WL(IndicatorLamp)
Information–ADL
•VerifythattheADLparametersarecorrectusingtheBendix® ACom®
diagnosticsoftware(version6.1orhigher).
• If necessary, contact your local Bendix representative to troubleshoot
theADLprogram.
152/14 612/14
Miscellaneous
12 1 ServiceDistanceor
DateExceeded
• Perform scheduled trailer maintenance and/or reset the Service
DistanceorDate.
• Perform the Installation Test using the Bendix ACom diagnostic
software(version6.1orhigher),orBendix® Trailer Information
Module.
153/00 612/00
12 2TrailerLoadOutof
Range
•Iftrailerisequippedwitharaise/lowervalve,verifyitisinthedrive
position.
•VerifythattheECUparametersfortheemptyandfullyloadedtrailer
conditions are correct using the Bendix ACom diagnostic software
(version6.1orhigher),orBendixTrailerInformationModule.
• If necessary, contact your local Bendix representative to troubleshoot
the trailer’s loading condition.
069/13 1059/13
12 3 Brake Pads Worn
• Manually check the condition of the pads on each brake to determine
ifanyrequirereplacement.
•Ifnopadsrequirereplacement,checkthewearsensorsandcables
for damage or defects.
070/01 1060/01
12 4LowSystem
Pressure,P1
• Check if the trailer’s service reservoir pressure is < 65 psi
(4.5 bar).
• If the trailer’s service reservoir pressure is > 65 psi (4.5 bar):
CycleIgnitionpower“OFF”and“ON”.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
254/11 1086/11
12 8 Trailer Information
Module Missing • Trailer Information Module and/or harness damaged or not present. 254/11 0/11
MechanicalLoadSensor
13 4LoadSensorError
• (Spring Suspension Systems) Inspect the linkage: Check that the
linkage is attached to the axle, inspect for damage to the linkage
components, loose connectors and mis‑installation.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
69/13 0/13
Diagnostic Trouble Codes (DTCs) (continued)
20
USING HAND‑HELD OR
PC‑BASED DIAGNOSTICS
Troubleshooting and Diagnostic Trouble Code (DTC)
clearing,aswellasbeginningareconguration,mayalso
be carried out using hand‑held or PC‑based diagnostic
tools such as the Bendix®TrailerRemoteDiagnosticUnit
(TRDU™), Bendix® ACom® diagnostics software, or the
Bendix® Trailer Information Module.
23. BENDIX ABS DIAGNOSTIC TOOLS
ACom Diagnostic Software
ACom diagnostic software (version 6.1 or higher) is
an RP‑1210 compliant PC‑based diagnostic software
program that provides the highest level of diagnostic
support for the Bendix® TABS‑6™ Adv MC module.
With Bendix ACom diagnostic software, maintenance
personnel can:
• ObtainDTCinformation(bothactiveandinactiveDTCs)
• Retrieve event history
• ClearinactiveDTCsandeventhistory
• VerifyECUconguration
• Perform system and component tests
• Read/write customer information in the scratch pad
• Save and print information
• Receive troubleshooting assistance
When diagnosing the Bendix TABS‑6 Adv MC module using
a PC and ACom diagnostic software, the computer’s serial
or parallel port can be connected to the vehicle’s diagnostic
connectorthroughanRP-1210compliantcommunications
device.
USB Cable
Noregon
Adapter
J2497 (PLC)
or J1939
Lap Top Computer
FIGURE 10 ‑ LAP TOP COMPUTER WITH BENDIX® ACOM®
DIAGNOSTIC SOFTWARE
For more information on the ACom diagnostic software,
orRP-1210complianttools,contactBendixorreferto
your local authorized Bendix parts outlet.
Bendix® Trailer Remote Diagnostic
Unit (TRDU™) Tool (802162)
LED lights
illuminate
Diagnostic
Trouble Codes
(10 LEDs)
FIGURE 11 ‑ THE BENDIX® TRDU™
The Bendix® TRDU™ tool provides the technician with
a visual indication of Antilock Braking System (ABS)
componentDTCinformation.TheTRDUtoolisspecically
designed for use with Bendix® Trailer ABS systems and
Bendix makes no claims for its operation and/or usability
with other brands of trailer ABS.
Features of the Bendix TRDU Tool
TheTRDUtoolattachestoa7-pin-to-7-pinadapter(See
Figure 12) andthenintotheJ560connectorofthetowing
vehicle.
Adapter
(802165)
To Towing
Vehicle
J560
Connector
To Trailer
Connector
FIGURE 12 ‑ TRDU™ TOOL AND ADAPTER
TheTRDUtoolcommunicatesacrossPLC.
TheTRDUtoolallowsthetechnicianto:
• Troubleshoot ABS system component problems using
DTCreportingviaLEDs.
• ResetDTCsonBendix®ABSECUsbyholdingamagnet
overtheresetoftheTRDUtoolforlessthan6seconds.
Troubleshooting
21
How the Bendix® TRDU™ Tool Operates
WhentheTRDUtoolispluggedintotheadapter—andthe
adapter/TRDUtoolisinstalledbetweenthetrailerconnector
andtheJ560connectorofthetowingvehiclethathasthe
ignitionon—alltheLEDswillilluminate,andthegreen
LEDwillash4times to indicate communications have
been established.
IftheABSECUhasnoactiveDiagnosticTroubleCodes
(DTCs),onlythegreenLEDwillremainilluminated.
IftheABSECUhasatleastoneactiveDTCtheTRDU
tooldisplaystherstDTCbyilluminatingtheredLEDs,
indicating the malfunctioning ABS component and its
locationonthevehicle.(SeeFigure13.)
FIGURE 13 ‑ THE BENDIX® TRDU™ TOOL DISPLAY
LED Diagnostic Trouble Codes
VLT- Power
ECU- ABSController
SEN- WheelSpeed
Sensor
MOD1- Modulator1
MOD2- Modulator2
MOD3- Modulator3
LFT- Left
RHT ‑ Right
ADD- Additional
ODO- Odometer
Example:IftheDTC
is"RightAdditional
Sensor",theTRDU™ tool
will display one green
andthreeredLEDs
LEDs
Green
VLT
Blue
ODO
All
others
are
Red
FIGURE 14 ‑ DIAGNOSTIC TROUBLE CODES USING THE
BENDIX® TRDU™ TOOL
IftherearemultipleDTCsontheABSsystem,theTRDU
tool will display one DTC rst, then once that DTC has
been repaired and cleared, the next code will be displayed.
TheTRDUtoolrepeatedlyblinksoutthemileagestored
once communications have been established. By counting
thesequenceofblinksand/orstrobesontheblueLED,the
odometerreadingisgiven.SeeSection10formoredetails.
• VLT (Flashing indicates either over- or under-voltage
condition)
TopinpointtherootcauseandtoensurethesystemDTCis
properlycorrectedthersttime,additionaltroubleshooting
may be necessary.
Note: When a TRDU tool is connected to a system with
a Bendix® TABS-6™ Adv MC module, and has established
communications, the ECU will use the ABS indicator lamp
to blink codes for all active DTCs.
Bendix TRDU Tool Reset Function
Themagneticresetswitchislocatedbytheletter"B"inthe
BendixlogoonthetopoftheTRDUtool.Whenamagnet
(with minimum of 30 gauss) is held over the switch for
lessthan6secondsthe"clearDTCs"commandissent.
(If a magnet is not available, you may use a spare wheel
speedsensor,sinceitsinternalmagnetwillbesufcient.)
Additionally, it is recommended at the end of any inspection
that the technician switches off and restores the power to
theABSECU,andthenre-checkstheABSindicatorlamp
andTRDUtooltoseeiftheyindicateanyremainingDTCs.
Bendix® Trailer Information Module
The Bendix Trailer Information Module is a display device
that combines the functionality of system diagnostics
with the ability to display and store other trailer‑related
information of value to an operator, driver or workshop.
MaximumbenetisobtainedfromtheTrailerInformation
Module functionality when it is mounted on the trailer so
that it is able to record events that occur during driving.
Alternatively, it may also be used as a workshop tool to
accessdiagnosticinformationortochecktheconguration
or run an installation test. In both cases the Trailer
InformationModuleisconnectedtotheJ1939EC5V TI
(CAN)connectionoftheauxiliaryconnectorwhichsupplies
the necessary information.
FIGURE 15 ‑ TRAILER INFORMATION MODULE
ADDITIONAL SUPPORT AT
www.bendix.com
For the latest information, and for free downloads of literature
and the Bendix® ACom®diagnosticssoftware, anditsUser
Guide, visit the Bendix website at www.bendix.com.
Bendix Technical Assistance Team
For direct personal technical support, call the Bendix
technical assistance team at 1‑800‑AIR‑BRAKE(1-800-
247-2725),MondaythroughFriday,8:00a.m.to6:00p.m.
EST.
Alternatively, you may e‑mail the Bendix Tech Team at:
techteam@bendix.com.
22
To better serve you, please record the following
information before you call the Bendix Tech Team, or
include this information in your e‑mail:
• Bendix product model number, part number and
conguration.
• Vehicle make and model.
• Vehicleconguration.(Numberofaxles,tiresize,etc.)
• System performance symptoms: When do they occur?
• What DTCs have been identied using LEDs, blink
codes or diagnostic tools?
• What troubleshooting/measurements have been
performed?
• What Bendix service data literature do you have or
need?
SERVICING THE BENDIX®
TABS‑6™ ADV MC MODULE
CAUTION: Special considerations need to be
taken to ensure that the Bendix® TABS‑6™ Adv MC
module has been properly installed on the trailer.
These include:
• Location and orientation of the module.
• Correct plumbing of the module.
• Correct deection sensor installation (where used).
• Correct location of the wheel speed sensors.
• Conguration of the ECU for ABS & Bendix® TRSP®
system parameters.
• Installation Test to verify proper installation of the
ABS/TRSP system.
Incorrect installation of the TABS‑6 Adv MC module
system can result in impaired ABS & TRSP system
functions. It is the responsibility of the end‑user to
ensure that the TABS‑6 Adv MC module system has
been installed correctly and tested as per the Bendix
recommended installation guidelines and system
drawings.
Prior to performing service to the TABS‑6 Adv MC module,
always perform the following steps:
1. Followallindustrysafemaintenancepracticesincluding
those on page 2 of this document.
2. Ideally, before removing the module, use Bendix®
ACom®diagnosticsoftwaretosavetheconguration
to the desktop. (After the module has been replaced,
thetechniciancanrestorethepreviousconguration
settings.)
3. Turnthepoweroff.
4. Draintheairpressurefromallreservoirs.
5. Remove as much contamination as possible prior to
disconnecting electrical connections and air hoses.
6. NotetheTABS-6AdvMCmodule'smountingposition
on the vehicle.
REMOVING THE TABS‑6 ADV MC MODULE
1. Opentheendcoversbyslidingthelockingtabstothe
left. If the module is to be reinstalled, retain the covers.
2. Disconnect the 7-pin ECU connector, the 12-pin
auxiliary/diagnostic harness (if present) and the two to
four 2‑pin wheel speed sensor connectors, depending
ontheconguration.
3. Markforreinstallationandthenremoveallairhoses
connected to the TABS‑6 Adv MC module.
4. Remove the TABS‑6 Adv MC module from the vehicle
by removing the mounting fasteners.
SERVICING THE CONTROL PORT FILTER
CAUTION! The TABS‑6 Advanced MC module
has an in-line lter in the control port (See Figure 2).
This lter should be inspected and cleaned (if any
contamination is found), every four months, 34,000
miles or 1,200 operating hours. For severe applications,
thisinspectionintervalmaybereduced.Ifthelterisfound
tobedamaged,installareplacement.Theltershould
also be inspected as part of any troubleshooting where
the service brakes are slow to apply and other possible
causes have been ruled out.
REINSTALLATION OF THE BENDIX® TABS‑6™
ADV MC MODULE
CAUTION! All service replacement parts for the
Bendix® TABS‑6™ Adv MC module are configured
specically by part number.
As mentioned during the Servicing the Bendix TABS-6
ADV MC Module step, ideally, before removing the
module, use Bendix® ACom® diagnostic software to
save the conguration to the desktop. The technician
can use ACom diagnostics to restore the previous
conguration settings.
Always verify that the correct service replacement ECU
is being installed by verifying that the part number is
the same as the original TABS‑6 Adv MC module. To
verify proper installation, perform the Installation Test
using the Bendix ACom diagnostic software (version
6.1 or higher) or use the Bendix® Trailer Information
Module.
Inspect the original mounting hardware: If it is in good
condition, it can be reused for installation. If replacement
hardwareisneeded,useClass8steelM10x1.5nutsand
lock washers for frame‑mounting.
Inspect the location selected for installation and clean as
necessary.
NOTE: Inspect all components, including the replace‑
ment TABS‑6 Adv MC module, for any external damage,
such as cracked valve ports, electronic housings, etc.
Any components found to be damaged should not be
installed on the vehicle and must be replaced.
23
1. TheTABS-6AdvMCmoduleshallbeinstalledwiththe
followingconsiderations(seeFigures16through18):
5°
5° VERTICAL
ORIENTATION
(ROLL ANGLE)
MUST BE
WITHIN FIVE
DEGREES OF
VERTICAL
FIGURE 16 ‑ INSTALLATION ON TRAILER (VERTICAL)
10°
10°
Driving
Direction
Longitudinal
Orientation
(Pitch Angle)
Must be within
Ten Degrees of
Vertical
FIGURE 17 ‑ INSTALLATION ON TRAILER (LONGITUDINAL)
The TABS-6 Adv MC module must be located no
more than 40 inches from the mid-point between
the axles, and within two inches from the center
line of the trailer (unless congured for an offset).
10°
10°
± 40" (1 m) from mid-point between the axles
± 2" (5 cm)
from center
of trailer
FIGURE 18 ‑ INSTALLATION ON TRAILER (CENTER LINE)
• With exhaust port facing downward and unobstructed
withsignicantfreespacebelow(>1inch).
• Within±40"ofthecenteroftheaxle(s)forproper
balanced brake applications.
• Within±2"fromthecenterlineofthetrailer(default).
Note,aleft/rightoffsetgreaterthan±2"mayhave
beenprogrammedintheECUandcanbeveried
using Bendix ACom diagnostic software (version
6.1orhigher).
• Yaw angle shall be ± 10° as measured from the
center line of the trailer.
• Pitchangleshallbe±10°asmeasuredfromaat
horizontal plane.
• Roll angle shall be within ± 5° as measured from a
athorizontalplane.
Frame‑mount module: The TABS‑6 Adv MC module
usesthreeClass8steelM10x1.5nutswithlockwashers,
torquedto354±44.4in.-lbs(40±5Nm).
2. Reconnect all air hoses and plugs to the module.
Depending on the installation, additional plugs may
be necessary. Thread sealant products that contain
Teonmaybeused,howeverthreadsealanttapeisnot
recommended as there is a potential for tape material
entering the valve and affecting the valve’s operation.
Make certain that no thread sealant enters the valve.
Allairhosesandttingsshouldbecheckedforleaks
prior to returning the vehicle to service.
3. Reconnect the ECU power, auxiliary if present and
wheelspeedsensorelectricalconnectorstotheECU.
Apply a moderate amount of non‑conductive electrical
grease to each connector pin before reconnecting.
 Note:Thewheelspeedsensorsmustfollowtheorienta‑
tionofthemoduleasshowninFigure19forxedaxle
trailers. Where a lift axle is present, and sensors are
tobeinstalledonthataxle,secondarysensorsSEand
SF must be used for the lift axle.
• Itisnecessarytoxthewheelspeedsensorsto
the orientation of the lateral acceleration sensor for
plausibility checks between the sensors.
• If the wheel sensor location does not match the
orientation of the Bendix® TABS‑6™ Adv MC module
shown in Figure 19, a Diagnostic Trouble Code
(DTC)willbegeneratedandtheABSindicatorlamp
will be illuminated.
• Refer to the raised lettering on the top cover for
wheelspeeddesignation,“S-C”,“S-D”,“S-E”,and
“S‑F”.
4. Leakage and Operational Tests must be performed
before returning the vehicle to service.
LEAKAGE AND OPERATIONAL TESTS
1. Beforeperformingtheleakagetests,blockthewheels.
2. Fully charge the air brake system and verify proper
brake adjustment.
3. Makeseveraltrailerbrakeapplicationsandcheckfor
prompt application and release at each wheel.
24
FIGURE 19 ‑ WHEEL SPEED SENSOR INSTALLATION
P22
P21
P21
P22
0° Mounting Orientation 180° Mounting Orientation
Vehicle Driving
Direction
Vehicle Driving
Direction
Right - “Curb Side”
Left - “Road Side”
Sensor
“S-F”
Sensor
“S-D” Sensor
“S-C”
Sensor
“S-E”
Sensor
“S-E” Sensor
“S-D” Sensor
“S-F”
Sensor
“S-C”
4. Check the TABS‑6 Adv MC module, modulator valve(s)
and all air hose fittings for leakage using a soap
solution.
Check the ABS solenoid body with the trailer service
brakes fully applied. If leakage is excessive — more
thanasingle1"bubblewithin1minute—replacethe
TABS‑6 Adv MC module.
Check the relay exhaust port with the trailer service
brakes released to be sure that leakage is less than
a single 1" bubble within 3 seconds.  If excessive
leakage is detected at the relay exhaust port, perform
the following test before replacing the TABS‑6 Adv MC
module:
• Apply the trailer spring brakes. Recheck for leakage
around the relay exhaust port. If the exhaust port
stops leaking, this indicates a leak between the
emergency and service sides of the spring brake
chamber. However, if the relay exhaust port
continues to leak excessively, replace the TABS‑6
Adv MC module.
5. Applypower andmonitorthe power-upsequenceto
verify proper system operation. See Section 15.
6. Calibrate and set odometer parameters, if necessary,
using a diagnostic tool. See Section 16.
7. Perform an installation test using a diagnostic tool.
Minimum tests that are required to verify the proper
installation of the ABS/TRSP system are:
• ECU Information: This test provides the user with
specic ECU information.  It is required that no
DTC’s(otherthan“end-of-linetestnotcompleted”)
arepresentandthattheECUhasbeencongured.
• Wheel End Sequence Test:  During this test,
checks are carried out that verify the correlation of
the wheel installed with a Wheel Speed Sensor and
the Pressure Modulator that controls the pressure
to the associated brake.
• Lateral Acceleration Test: The installation angle
informationisretrievedfromtheECUandcompared
tothepredenedlimits (+/-5degrees). Thistest
veriesthattheunitisinstalledasclosetohorizontal
as possible.
• Pressure Sensor Test: Duringthistest,checksare
carried out that verify that the proper response is
received from the pressure sensors during a brake
application.
• Axle Load Sensing Test (Air Ride): The test
has the user verify the expected measurement
of the load pressure sensor, Port 42, for air ride
suspensions. The program provides the reading
of the sensor.
25
• Mechanical Load Sensor Test (Mechanical
Spring Ride): The test has the user verify the
expected measurement of the spring deection
sensor. The program provides the reading of the
sensor.
• Customer Scratch Pad: Thetesterisrequested
toinputdataintotheeldsdisplayedonthescreen.
ThisdatawillbestoredintheECUandalsocanbe
storedtoaleonthecomputerorprintedoutfor
reference.
8. Whereasafelocation(e.g.restrictedaccessareaor
test track) is available, it is possible to road test the ABS
function by making an abrupt stop from a vehicle speed
of about 20 MPH to check for proper function.  The
wheels should not enter a prolonged lock condition and
ABS function should be audible. It is the responsibility
of the technician to perform this test in a safe location.
ABS WIRING
All connector leads of the Bendix® TABS‑6™ Adv MC
module pigtail harness are weather sealed at the connector
interface and are clearly labeled for proper installation.
Bendix provides over‑molded versions of the TABS‑6
wiring harness and Bendix recommends that the complete
harness be replaced if corrosion or damage occurs.
When troubleshooting ABS wiring, some general rules
should be followed where applicable.
1. Check all wiring and connectors to ensure they are
secure and free from visible damage (e.g. cuts,
abrasions, etc.).
2. Checkforevidenceofwirechangduetopoorrouting,
or poor securing of wires.
3. Checkconnectorsforproperinsertionandlocking.
4. Verify that the connector pins are properly greased with
a non‑conductive electrical grease compound.
5. Connector terminals must not show signs of corrosion
or exposure to the environment.
6. Never pierce wire insulation when checking for
continuity.
7. Donotdeformindividualpinsorsocketsduringprobing
with a volt/ohm meter.
8. Itisstronglyrecommendedthatallwiringharnessesand
sensorleadsareproperlysecuredatleastevery18inches.
9. Apply a moderate amount of non‑conductive electrical
grease to each connector pin before reconnecting.
26
FIGURE 20 ‑ BENDIX® TABS -6™ ADV MC MODULE ELECTRICAL SCHEMATIC - 2S/2M
FIGURE 21 ‑ BENDIX TABS-6 ADV MC MODULE ELECTRICAL SCHEMATIC - 4S/2M
Troubleshooting: Electrical Schematics
1
7
4
12
11
9
10
8
7
6
5
4
3
1
7
6
3
5
2
1
4
2
1
2
1
4
3
2
1
1
2
3
4
2
1
1
2
1
2
2
1
1
2
1
2
2
S-DS-FS-C S-E
B
A
E
D
D
E
A
B
7
6
5
4
4
5
6
7
CC
3
2
1
2
1
3
1
3
2
4
4
2
3
1
1
2
3
4
4
3
2
1
55
66
87
30 85
86
SENSOR “S-D” (-)
SENSOR “S-F” (-)
SENSOR “S-E” (-)
SENSOR “S-C” (-)
SENSOR “S-D” (+)
SENSOR “S-D”
7-WAY SAE J560 CONNECTOR
TRAILER-MOUNTED
ABS INDICATOR
LAMP
Bendix
®
Trailer
Information Module:
G2 (OPTIONAL)
SENSOR “S-F” (+)
SENSOR
“S-F”
5-PIN PACKARD
CONNECTOR
4-PIN CONNECTORS
7-PIN
CONNECTOR
SENSOR “S-E” (+)
SENSOR “S-E”
SENSOR “S-C” (+)
SENSOR “S-C”
GROUND
NOT USED
NOT USED
NOT USED
NOT USED NOT USED
NOT USED NOT USED
Rear Dump Control
Relay and ATC Valve
(Optional)
NOT USED
NOT USED
ABS INDICATOR LAMP (AUX I/O 7)
X1 “POWER”
X2 “IN-OUT”
IGNITION VOLTAGE
BRAKE LAMP VOLTAGE
NOT USED
AUX I/O 1
AUX I/O 2
AUXILIARY I/O 3
SENSOR SUPPLY
SENSOR INPUT
SENSOR GROUND
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED NOT USED
Lift Bag
Pressure
Switch
(Optional)
Load
Sensor
(Optional)
SAE J1939 (H)
SAE J1939 (L)
AUX I/O RETURN 1 & 2
AUX I/O RETURN 3
TABS-6ADVANCEDMCMODULEECU
1
7
4
12
11
9
10
8
7
6
5
4
3
1
7
6
3
5
2
1
4
2
1
2
1
4
3
2
1
1
2
3
4
2
1
1
2
2
1
1
2
2
S-DS-FS-C S-E
B
A
E
D
D
E
A
B
7
6
5
4
4
5
6
7
CC
3
2
1
2
1
3
1
3
2
4
4
2
3
1
1
2
3
4
4
3
2
1
55
66
87
30 85
86
SENSOR “S-D” (-)
NOT USED
NOT USED
SENSOR “S-C” (-)
SENSOR “S-D” (+)
SENSOR “S-D”
7-WAY SAE J560 CONNECTOR
TRAILER-MOUNTED
ABS INDICATOR
LAMP
Bendix
®
Trailer
Information Module:
G2 (OPTIONAL)
NOT USED
5-PIN PACKARD
CONNECTOR
4-PIN CONNECTORS
7-PIN
CONNECTOR
NOT USED
SENSOR “S-C” (+)
SENSOR “S-C”
GROUND
NOT USED
NOT USED
NOT USED
NOT USED NOT USED
NOT USED NOT USED
Rear Dump Control
Relay and ATC Valve
(Optional)
NOT USED
NOT USED
ABS INDICATOR LAMP (AUX I/O 7)
X1 “POWER”
X2 “IN-OUT”
IGNITION VOLTAGE
BRAKE LAMP VOLTAGE
NOT USED
AUX I/O 1
AUX I/O 2
AUXILIARY I/O 3
SENSOR SUPPLY
SENSOR INPUT
SENSOR GROUND
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED NOT USED
Lift Bag
Pressure
Switch
(Optional)
Load
Sensor
(Optional)
SAE J1939 (H)
SAE J1939 (L)
AUX I/O RETURN 1 & 2
AUX I/O RETURN 3
TABS-6ADVANCEDMCMODULEECU
27
FIGURE 22 - BENDIX® TABS-6™ ADV MC MODULE - 2S/2M SIDE CONTROL (0 DEGREE) ABS ELECTRICAL & AIR SYSTEM
FIGURE 23 - BENDIX TABS-6 ADV MC MODULE - 2S/2M SIDE CONTROL (180 DEGREE) ABS ELECTRICAL & AIR SYSTEM
Troubleshooting: System Schematics
2S/2M - SIDE CONTROL - Fixed Axles
0 Degree Mounting Orientation
Ignition
Power
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-Channel
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Trailer ABS Pigtail Harness
ABS Indicator Lamp
5-Pin ABS
Connector
Supply Line
Control Line
Right - “Curb-Side”
Semi-Trailer Tandem Axle Trailer
Left - “Road-Side”
7-Pin SAE J560
Connector
P21
P22
Brake Lamp Power
Ground “S-D”
“S-C”
Bendix® WS-24™ Wheel Speed Sensor
Bendix® WS-24™ Wheel Speed Sensor
Air Bellow
(where used)
Load Sensor
(where used)
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
2S/2M - SIDE CONTROL - Fixed Axles
180 Degree Mounting Orientation
ABS
Ignition
Power
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-Channel
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Trailer ABS Pigtail Harness
ABS Indicator Lamp
5-Pin ABS
Connector
Supply Line
Control Line
Right - “Curb-Side”
Semi-Trailer Tandem Axle Trailer
Left - “Road-Side”
7-Pin SAE J560
Connector
Brake Lamp Power
Ground
“S-C”
“S-D”
Bendix® WS-24™ Wheel Speed Sensor
Bendix® WS-24™ Wheel Speed Sensor
P21
P22
Air Bellow
(where used)
Load Sensor
(where used)
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
28
4S/2M - SIDE CONTROL - Fixed Axles
0 Degree Mounting Orientation
Ignition
Power
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-
Channel
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Trailer ABS Pigtail Harness
ABS Indicator Lamp
5-Pin ABS
Connector
Supply Line
Control Line
Right - “Curb-Side”
Semi-Trailer Tandem Axle Trailer
Left - “Road-Side”
7-Pin SAE J560
Connector
Brake Lamp Power
Ground “S-D”“S-F”
“S-E” “S-C”
Bendix® WS-24™ Wheel Speed Sensors
Bendix® WS-24™ Wheel Speed Sensors
P21
P22
Air Bellow
(where used)
Load Sensor
(where used)
FIGURE 24 - BENDIX® TABS -6™ ADV MC MODULE - 4S/2M SIDE CONTROL (0 DEGREE) ABS ELECTRICAL & AIR SYSTEM
FIGURE 25 - BENDIX TABS-6 ADV MC MODULE- 4S/2M SIDE CONTROL (180 DEGREE) ABS ELECTRICAL & AIR SYSTEM
Troubleshooting: System Schematics
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
4S/2M - SIDE CONTROL - Fixed Axles
180 Degree Mounting Orientation
Ignition
Power
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-Channel
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Trailer ABS Pigtail Harness
ABS Indicator Lamp
5-Pin ABS
Connector
Supply Line
Control Line
Right - “Curb-Side”
Semi-Trailer Tandem Axle Trailer
Left - “Road-Side”
7-Pin SAE J560
Connector
Brake Lamp Power
Ground
“S-E”“S-C”
“S-D” “S-F”
Bendix® WS-24™ Wheel Speed Sensors
Bendix® WS-24™ Wheel Speed Sensors
P21
P22
Air Bellow
(where used)
Load Sensor
(where used)
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
29
FIGURE 26 - BENDIX® TABS -6™ ADV MC MODULE - TYPICAL 4S/2M AXLE CONTROL ABS ELECTRICAL & AIR SYSTEM
FIGURE 27 - BENDIX TABS-6 ADV MC MODULE - 4S/2M AXLE CONTROL (180 DEGREE) ABS ELECTRICAL & AIR SYSTEM
Troubleshooting: System Schematics
P21
P22
4S/2M - AXLE CONTROL - Fixed Axles
180 Degree Mounting Orientation
Ignition
Power
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-Channel
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Trailer ABS Pigtail Harness
ABS Indicator Lamp
5-Pin ABS
Connector
Supply Line
Control Line
Right - “Curb-Side”
Semi-Trailer Tandem Axle Trailer
Left - “Road-Side”
7-Pin SAE J560
Connector
Brake Lamp Power
Ground
“S-D” “S-F”
“S-E”“S-C”
Bendix® WS-24™ Wheel Speed Sensors
Bendix® WS-24™ Wheel Speed Sensors
Air Bellow
(where used)
Load Sensor
(where used)
4S/2M - AXLE CONTROL - Fixed Axles
0 Degree Mounting Orientation
Ignition
Power
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-Channel
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Trailer ABS
Pigtail
Harness
ABS Indicator Lamp
5-Pin ABS
Connector
Supply Line
Control Line
Right - “Curb-Side”
Semi-Trailer Spread Axle Trailer
Left - “Road-Side”
7-Pin SAE J560
Connector
P21
P22
Brake Lamp Power
Ground
Bendix® WS-24™ Wheel Speed Sensors
Bendix® WS-24™ Wheel Speed Sensors
“S-D”
“S-F”
“S-E” “S-C”
Air Bellow
(where used)
Load Sensor
(where used)
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
30
FIGURE 28 - 4S/2M SIDE CONTROL (0 DEGREE) WITH FRONT LIFT AXLE, ABS ELECTRICAL & AIR SYSTEM
FIGURE 29 - 4S/2M SIDE CONTROL (0 DEGREE) WITH REAR LIFT AXLE, ABS ELECTRICAL & AIR SYSTEM
Troubleshooting: System Schematics
4S/2M - SIDE CONTROL - Front Lift Axle
0 Degree Mounting Orientation
Ignition
Power
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-
Channel
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Trailer ABS Pigtail Harness
Dashed-line box
Shows Lift Axle
ABS Indicator Lamp
Air Bellow
(where used)
Load Sensor
(where used)
5-Pin ABS Connector
Supply Line
Control Line
Right - “Curb-Side”
Semi-Trailer Tandem Axle Trailer
Left - “Road-Side”
7-Pin SAE J560
Connector
P21
P22
Brake Lamp Power
Ground “S-D”
“S-C”
Bendix® WS-24™ Wheel Speed Sensors
Bendix® WS-24™ Wheel Speed Sensors
“S-E”
“S-F”
Lift Axle
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
Ignition
Power
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-
Channel
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Trailer ABS Pigtail Harness
Dashed-
line box
Shows
Lift Axle
ABS Indicator Lamp
Air Bellow
(where used)
Load Sensor
(where used)
5-Pin ABS
Connector
Supply Line
Control Line
Right - “Curb-Side”
Semi-Trailer Tandem Axle Trailer
Left - “Road-Side”
7-Pin SAE J560
Connector
P21
P22
Brake Lamp Power
Ground “S-D”
“S-C”
Bendix® WS-24™ Wheel Speed Sensors
Bendix® WS-24™ Wheel Speed Sensors
“S-E”
“S-F”
Lift Axle
4S/2M - SIDE CONTROL - Rear Lift Axle
0 Degree Mounting Orientation
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
31
FIGURE 30 - 4S/2M SIDE CONTROL (180 DEGREE) WITH FRONT LIFT AXLE, ABS ELECTRICAL & AIR SYSTEM
FIGURE 31 - 4S/2M SIDE CONTROL (180 DEGREE) WITH REAR LIFT AXLE, ABS ELECTRICAL & AIR SYSTEM
Troubleshooting: System Schematics
ABS
4S/2M - SIDE CONTROL - Front Lift Axle
180 Degree Mounting Orientation
Ignition
Power
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Supply
Line
Control
Line
Left - “Road-Side”
7-Pin
SAE J560
Connector
Bendix® WS-24™ Wheel Speed Sensors
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-
Channel
Trailer ABS Pigtail Harness
Dashed-line box
Shows Lift Axle
ABS Indicator Lamp
Air Bellow
(where used)
Load Sensor
(where used)
5-Pin ABS
Connector
Right - “Curb-Side”
Semi-Trailer Tandem Axle Trailer
P21
P22
Brake Lamp
Power
Ground
“S-D”
“S-C”
Bendix® WS-24™ Wheel Speed Sensors
“S-E”
“S-F”
Lift Axle
Ignition
Power
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Dashed-
line box
Shows
Lift Axle
Supply
Line
Control
Line
Left - “Road-Side”
7-Pin
SAE J560
Connector
Bendix® WS-24™ Wheel Speed Sensors
Lift Axle
4S/2M - SIDE CONTROL - Rear Lift Axle
180 Degree Mounting Orientation
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-
Channel
Trailer ABS Pigtail Harness
ABS Indicator Lamp
Air Bellow
(where used)
Load Sensor
(where used)
5-Pin ABS
Connector
Right - “Curb-Side”
Semi-Trailer Tandem Axle Trailer
P21
P22
Brake Lamp
Power
Ground
“S-D”
“S-C”
Bendix® WS-24™ Wheel Speed Sensors
“S-E”
“S-F”
32
4S/2M - AXLE CONTROL - Front Lift Axle
180 Degree Mounting Orientation
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
Ignition
Power
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-
Channel
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Trailer ABS Pigtail Harness
Dashed-line box
Shows Lift Axle
ABS Indicator Lamp
Air Bellow
(where used)
Load Sensor
(where used)
5-Pin ABS
Connector
Supply Line
Control Line
Right - “Curb-Side”
Semi-Trailer Spread Axle Trailer
Left - “Road-Side”
7-Pin SAE J560
Connector
P22
P21
Brake Lamp Power
Ground
“S-C”
“S-D”
Bendix®
WS-24™
Wheel Speed
Sensors
Bendix® WS-24™
Wheel Speed
Sensors
“S-F”
“S-E”
Lift Axle
4S/2M - AXLE CONTROL - Rear Lift Axle
180 Degree Mounting Orientation
Ignition
Power
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-
Channel
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Trailer ABS Pigtail Harness
Dashed-line box
Shows Lift Axle
ABS Indicator Lamp
Air Bellow
(where used)
Load Sensor
(where used)
5-Pin ABS
Connector
Supply Line
Control Line
Right - “Curb-Side”
Semi-Trailer Spread Axle Trailer
Left - “Road-Side”
7-Pin SAE J560
Connector
P22
P21
Brake Lamp Power
Ground
“S-D”
“S-C”
Bendix®
WS-24™
Wheel Speed
Sensors
Bendix® WS-24™
Wheel Speed
Sensors
“S-E”
“S-F”
Lift Axle
FIGURE 32 - 4S/2M AXLE CONTROL (180 DEGREE) WITH FRONT LIFT AXLE, ABS ELECTRICAL & AIR SYSTEM
FIGURE 33 - 4S/2M AXLE CONTROL (180 DEGREE) WITH REAR LIFT AXLE, ABS ELECTRICAL & AIR SYSTEM
Troubleshooting: System Schematics
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
33
FIGURE 34 - BENDIX® TABS- 6™ ADV MC MODULE - TYPICAL 4S/2M SYSTEM WITH FRONT LIFT AXLE
FIGURE 35 - BENDIX TABS-6 ADV MC MODULE - 4S/2M AXLE CONTROL SYSTEM WITH REAR LIFT AXLE
Troubleshooting: System Schematics
5-Pin ABS
Connector
4S/2M - AXLE CONTROL - Front Lift Axle
0 Degree Mounting Orientation
Ignition
Power
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-Channel
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Trailer ABS
Pigtail
Harness
ABS Indicator Lamp
Supply Line
Control Line
Right - “Curb-Side”
Semi-Trailer Spread Axle Trailer
Left - “Road-Side”
7-Pin SAE J560
Connector
P21
P22
Brake Lamp Power
Ground Bendix® WS-24™
Wheel Speed
Sensors
Bendix® WS-24™
Wheel Speed
Sensors
“S-D”
“S-F”
“S-E” “S-C”
Air Bellow
(where used)
Load Sensor
(where used)
Dashed-line box
Shows Lift Axle
Lift Axle
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
5-Pin ABS
Connector
P21
P22
4S/2M - AXLE CONTROL - Rear Lift Axle
0 Degree Mounting Orientation
Ignition
Power
Trailer Chassis Harness
Bendix®
TABS-6™
Advanced
Multi-Channel
Bendix®
SR-5™ Trailer
Spring Brake
Valve
Trailer ABS
Pigtail
Harness
ABS Indicator Lamp
Supply Line
Control Line
Right - “Curb-Side”
Semi-Trailer Tandem Axle Trailer
Left - “Road-Side”
7-Pin SAE J560
Connector
Brake Lamp Power
Ground
“S-C” “S-E”
“S-F”“S-D”
Bendix® WS-24™
Wheel Speed
Sensors
Bendix® WS-24™
Wheel Speed
Sensors
Air Bellow
(where used)
Load Sensor
(where used)
Dashed-line box
Shows Lift Axle
Lift Axle
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
34
SectionA:(Power-UpSequence)Trailer‑Mounted ABS Indicator Lamp ...............Page 34
SectionB:(Power-UpSequence)Dash‑Mounted ABS Indicator Lamp ................Page 35
Section C: Troubleshooting the Trailer‑Mounted ABS Indicator Lamp Circuitry .......Page 36
SectionD:Troubleshooting the Power Supply...................................Page 37
SectionE:Troubleshooting the WS‑24™ Wheel Speed Sensors.....................Page 38
Section F: Troubleshooting the Load Sensor (Out‑of‑Range Condition)..............Page 39
Diagnostic trouble code information can be retrieved
from the Bendix® TABS‑6™ Adv MC module by using blink
code diagnostics, or a diagnostic tool. The following
troubleshootingowchartswillhelpthetechnicianisolate
thecauseandconrmwhethertheproblemresidesinthe
component, wiring or connectors.
Troubleshooting should always begin by observing the
dash or trailer‑mounted ABS indicator lamp during the
TABS-6Adv MC module's power-up sequence.  If it is
necessary to take electrical measurements, always begin
by taking voltage and resistance measurements at the
7-pinECUpigtailharnessconnector.
Oncethesourceoftheproblemisfound,isolatethearea
needing repair by repeating the measurements at all
connections in the affected circuit towards the modulator,
wheel speed sensor, etc.
Novoltageorresistancemeasurementsaretobemade
on the bulkhead connector pins of the module.
Troubleshooting: Flowcharts
SECTION A: POWER‑UP SEQUENCE ‑ TRAILER‑MOUNTED
ABS INDICATOR LAMP
ObservetheABSIndicatorLamp
atPower-Up Apply ignition or brake light power
Troubleshoot the trailer‑mounted
ABS indicator lamp circuitry.
Go to Section C
Troubleshoot
the trailer‑
mounted ABS
indicator lamp
circuitry. Go to
Section C
The module is functioning normally.
NoservicetotheABSunitisneeded.
Does
the
trailer‑mounted
ABS indicator lamp
immediately illuminate when
power is applied to the
trailer?
Doesthe
trailer‑mounted ABS
indicatorlampstay“ON”for
6.5 seconds and then
turn“OFF”?
NO
NO
YES
YES
Doesthe
trailer‑mounted ABS
indicatorlampstay“ON”for
2.5 seconds and then
turn“OFF”?
NO
PerformEnd-of-Linetest
YES
35
SECTION B: (POWER‑UP SEQUENCE)
DASH‑MOUNTED ABS INDICATOR LAMP
Observethedash-mountedTrailer
ABSIndicatorLampatPower-Up
VerifythataPLCtrailerisconnected
to the tractor via the 7‑pin connector.
TurntheignitionONandobservethe
dash‑mounted trailer ABS indicator
lamp.
Trailer ABS indicator lamp does
not illuminate.
Note:Onlytowingvehiclesbuilt
afterMarch1,2001arerequired
to have a trailer ABS indicator
lamp. The trailer ABS indicator
lamp, located on the vehicle dash,
isonlyactivatedbyaPLCsignal
from a trailer or diagnostic tool. The
towingtrailermustbeequippedwith
anABSunitwithPLC.
VerifythataPLCsignalispresent
on the trailer ignition power lines.
(RefertothePLCCommunications
section of this document.)
IfaPLCsignalispresentandthe
trailer ABS lamp does not illuminate
at ignition, troubleshoot the dash‑
mounted trailer lamp circuit on the
tractor.
The dash‑mounted trailer ABS
indicatorlampstays“ON”.Thisis
an indication that the trailer ABS
unithasaDiagnosticTrouble
Code(DTC).
If the dash‑mounted trailer ABS
indicatorlampremains“ON”with
no trailer connected, troubleshoot
the dash‑mounted trailer lamp
circuit on the tractor.
If the trailer ABS lamp remains
“ON”withatrailerconnected,
rerunthepower-upsequencefor
the trailer‑mounted ABS indicator
lamp. Go to Section A.
Does
the dash‑
mounted ABS
indicator lamp illuminate
within 2 seconds of ignition
power being applied to
the vehicle?
NO
YES
The module is
functioning normally.
NoservicetotheABS
unit is needed.
Does
the
trailer‑
mounted ABS
indicator lamp stay
“ON”for6.5
seconds and
then turn
“OFF”?
NO
YES
Does
the trailer‑
mounted ABS
indicatorlampstay“ON”
for 2.5 seconds
and then turn
“OFF”?
NO
Perform
End-of-Linetest
YES
36
SECTION C: TROUBLESHOOTING THE TRAILER‑MOUNTED
ABS INDICATOR LAMP CIRCUITRY
LookingintotheBendix® TABS‑6™ Adv MC
Module 7‑pin Connector Pigtail Harness.
Pin 4 is the ground pin.
Pin 5 is the ABS indicator lamp pin.
The trailer‑mounted ABS indicator
lamp did not illuminate during the
power-upsequence.
The trailer‑mounted ABS indicator
lampremains“ON”duringthepower-
upsequence.
Troubleshoot the power supply
to the ABS module.
GotoSectionD.
Continue if the power and ground
wiringareOK.
Turn off the power to the module.
Inspect the condition of the ABS
indicator lamp, connector and ground.
Using a volt/ohm meter, verify
continuity from the trailer chassis
ground (pin 4) to the ground pin of
the indicator lamp.
If repairs are made, rerun the
power-upsequence.Goto
Section A.
Continue if the indicator lamp and
groundwirecheckoutOK.
DetermineifamoduleDiagnosticTrouble
Code(DTC)existsusinganyofthefollowing
methods:
• Blinkcodediagnostics,Section20,
• PCdiagnostics,Section23,
• TrailerRemoteDiagnosticUnit,
Section23,or
• Bendix® Trailer Information Module, also
Section23.
IfDTC(s)exist,andrepairsaremade,rerun
thepower-upsequence.GotoSectionA.
ContinueifnoDTCsarefoundandtheABS
module appears to be functioning normally.
With power off to the ABS
module,disconnectthe7-pinECU
connector.
Verify continuity from the ABS
indicator lamp pin (pin 5) of the
ECUconnectortotheABSindicator
lamp connector.
If repairs are made, rerun the
power-upsequence.Goto
Section A.
If the condition persists, replace the
ABS module.
With power off to the ABS
module,disconnectthe7-pinECU
connector.
Usingavoltmeter,verifythatthere
is not a short to the Vbat between
theABSWLpinoftheECU
connector and the ABS indicator
lamp connector.
If repairs are made, rerun the
power-upsequence.Goto
Section A.
If the condition persists, replace the
ABS module.
37
Measure the loaded
voltage across a type
1157brakelightbulb.
LookingintoTABS-6
Advanced MC Module 7‑pin
Connector Pigtail Harness
Measure:
IgnitionPower(pin1)to
Ground (pin 4), and
BrakeLampPower(pin2)
to Ground (pin 4).
SECTION D: TROUBLESHOOTING THE
POWER SUPPLY
Turn off the power to the
module,disconnectthe7-pinECU
connector.
Check for high resistance
(corrosion, wire/connector damage
or improper termination) of the
power lines, resulting in a high
voltage drop across the lines.
Measure the voltage under load by
placingaloadsuchasatype1157
brake light bulb between the Ignition
Power pin and Ground pin of the
ECUconnector,whilethelampisin
place.
With ignition power to the trailer,
measure the voltage between the
IgnitionPower(pin1)andGround
(pin4)oftheECUconnector.
Repeat the voltage measurement
with brake lamp power to the trailer,
betweentheBrakeLampPower
(pin 2) and the Ground (pin 4) of the
ECUconnector.
The operating range of the module
is8.0-32.0VDC.Verifythatthe
voltage drop measurements are no
lessthan1.0VDCfromthevehicle
voltage at both the ignition and
brake power inputs
With a volt/ohm meter, check
thepowerandgroundwiring.Look
for corroded or damaged wires or
connectors.
If repairs are made, rerun the
power-upsequence.Goto
Section A.
If proper loaded and unloaded
voltageismeasuredattheECU
connector, and no corrosion or
damage is found on the wiring,
connectorsorECU,replacethe
module.
With a volt/ohm meter, check the
powerandgroundwiring.Lookfor
corroded or damaged wire or connectors.
If repairs are made, rerun the power‑up
sequence.GotoSectionA.
With
ignition
power to
the trailer (engine
running), measure the
voltage between the ignition
Power pin and the Ground pin of the
ECUconnector.
Repeat the voltage measurement with brake lamp
powertothetrailer,andbetweentheBrakeLampPower
pinandtheGroundpinoftheECUconnector.
The operating range of the module is
8.0-32.0VDC.Canyouverifythat
measurementsfoundareequal
to the vehicle voltage (within
1VDC)atboththe
ignition and brake
power
inputs?
NO
YES
38
S‑D and S‑F Sensor
(SeeFigure19forUsage.)
S‑C and S‑E Sensor
(SeeFigure19forUsage.)
SECTION E: TROUBLESHOOTING THE
BENDIX® WS‑24™ WHEEL SPEED SENSORS (WSS)
Turn off the power to the module, disconnect
the wheel speed sensor connector.
Note: Both Static and Dynamic WSS DTCs may be present:
S-F S-E
S-D S-C
If Dynamic WSS DTCs are present:
Rotate the affected wheel and verify a minimum
of0.25VACsensoroutput@0.5RPSacrossthe
wheel speed sensor pins. A properly positioned
sensorcanoutputmorethan2.0VAC@1RPS
Verify/inspect the following:
• Speed sensors properly contact the tone ring.
• The condition and retention force of the sensor
sleeve.
• Proper sensor lead condition, routing and
clamping sleeve.
• Condition of tone ring mounting and teeth.
• Proper number of tone ring teeth per sensed
wheel.
• Proper adjustment of wheel bearings.
• Condition of foundation brakes.
• Check for corroded/damaged wiring or
connectorsbetweentheECUandtheWSS.
Make repairs as needed (replace wiring and/or ABS
components).
ResetactiveDTC’sbyusinganyofthefollowing
methods:
• BlinkCodeDiagnostics,Section20,
• PCdiagnostics,Section23.
• BendixRemoteTrailerDiagnosticUnit(TRDU)
andmagnet,Section23.
• Bendix®TrailerInformationModule,Section23.
(If you do not reset manually, typically these will reset
automatically when the vehicle has been driven for a
period of time.)
Thenrerunthepowerupsequence.GotoSectionA.
If Static WSS DTCs are present:
Usingavolt/ohmmetertomeasuretheconnector
pinsofthesensorwithaDTC,verify950-1950
OHMSacrossthesensorconnectorpins.
Verify/inspect the following:
• Nocontinuityfromsensorconnectorpinsto
ground.
• Vbat not measured at either sensor connector
pins.
• Verify there is no continuity between the sensor
leads and other sensors.
• Sensor/ECUwiringandconnectorsarenot
damaged or corroded.
• Proper sensor wire routing and clamping.
Make repairs as needed (replace wiring and/or ABS
components).
ResetactiveDTC’sbyusinganyofthefollowing
methods:
• BlinkCodeDiagnostics,Section20,
• PCdiagnostics,Section23.
• BendixRemoteTrailerDiagnosticUnit(TRDU)
andmagnet,Section23.
• Bendix®TrailerInformationModule,Section23.
ThencheckforDynamicWSSDTCs,seeleft
column.
Thenrerunthepowerupsequence.GotoSectionA.
39
SECTION F: TROUBLESHOOTING THE
LOAD SENSOR (OUT‑OF‑RANGE CONDITION)
(Note: The indicator lamp for this condition is illuminated only after the vehicle moves.)
Turn off the power to the module.
For spring suspension system trailers:
Verify/inspect the following:
1. Inspect the load sensor linkage:
• Check that the linkage is attached to the axle
clamp.
• Inspect for damage to the linkage components,
loose connectors and mis‑installation.
• Check that the load sensor lever rod is in a
horizontal position with the trailer empty.
• Verifythatthesensorlinkagehasnotipped
over so that it faces the opposite direction.
2. Switchonpowertothemodule.UsingBendix®
ACom®Diagnostics,opentheTRSPSensors
screen and press “Start.” Find the load (in lbs.)
that the sensor is registering, and verify that the
actual trailer load is consistent with the value
found. Where the value does not appear to
be correct, perform the load sensor resistance
check:
• Unplugthe12-pinconnectorfromthemodule.
• With the load sensor lever in the horizontal
position,verifythatapproximately2.5KOhmsis
measuredbetweenpinsfour(4)andve(5)and
betweenpinsve(5)andsix(6).UsingBendix
AComDiagnosticsopentheconguration
screen,thentheLoadandSensorConguration
tab,andselectthe“LoadSensing”panel.
Verify that the current “Sensing Type” is shown
as“External.”Ifnot,changetheselectionto
“External.”
Where the value does not appear to be correct,
enterthecorrectvalue(s)ontheconguration
screen. If your version of Bendix ACom
Diagnosticsdoesnotpermityoutomakethese
changes, update your copy of the program
(available as a free download from the support
pages at www.bendix.com.)
Note:Useascaletoobtaintheactualempty
trailer weight and use a pressure gauge to obtain
actual empty trailer suspension air bag pressure.
Wherepossible,obtaintheload\pressurecurve
fromthesuspensionmanufacturerforthespecic
suspension\airbagcombinationtondtheexpected
values for this vehicle.
Thenrerunthepowerupsequence.GotoSectionA.
For air suspension system trailers:
Verify/inspect the following:
1. Check that port P42 is connected by an
unkinked air hose to the primary suspension air
bags.
2. Check that the suspension height control valve
is functioning correctly.
3. Check for air leakage in the suspension system.
4. Switchonpowertothemodule.UsingBendix®
ACom®Diagnostics,opentheTRSPSensors
screen and select “Start.” Find the load (in lbs.)
that the sensor is registering, and verify that the
actual trailer load is consistent with the value
found.
5. Where the value does not appear to be correct,
usingBendixAComDiagnostics,openthe
“Pressures” screen and select “Start.” Read
the pressure shown for the airbag port (P42).
If the load value, or pressure value are not as
expected,openthe“Conguration”screen;then
theLoadandSensorCongurationtab,and
selectthe“LoadSensing”panel.Verifythatthe
current “Sensing Type” is shown as “Internal.” If
not, change the selection to “Internal.”
Notethevaluesshownonthescreenforthe
current load and pressure. Verify that the values
shown on the screen for the empty and laden
weight and voltage are correct.
Where the value does not appear to be correct,
enterthecorrectvalue(s)ontheconguration
screen. If your version of Bendix ACom
Diagnosticsdoesnotpermityoutomakethese
changes, update your copy of the program
(available as a free download from the support
pages at www.bendix.com.)
Note:Useascaletoobtaintheactualempty
trailer weight and use a pressure gauge to obtain
actual empty trailer suspension air bag pressure.
Wherepossible,obtaintheload\pressurecurve
fromthesuspensionmanufacturerforthespecic
suspension\airbagcombinationtondtheexpected
values for this vehicle.
Thenrerunthepowerupsequence.GotoSectionA.
40
ECU Part Number Label
The external part number label is located above the control
port of the module. If this label is not readable for any
reason, the Bendix part number is etched into the module
castingabovethecontrolport(SeeFigure1).ABendix
manufacturing date code is to the right of the part number
inscription.
There is an additional label under one of the covers that
showsapin-outdiagramforthe12-pinauxiliaryconnector.
FIGURE 36 ‑ LABEL INFORMATION
Production
Data Component
ID
Final 8 Digits
Show Initial
Software
Loaded
Bendix Part Number
Knorr-Bremse
YYWWDAAAAYYWWDXXXXXXXX
K987654Vxx
X
03
Mxxx
K123456
Software Revision Level
ThenumberoftheinitialsoftwareloadedontheECUis
also indicated. The current software revision number can
be read using a diagnostic tool.
Document Revision Level
Please visit Bendix.com to ensure you have the latest
version of this document.
BW2726©2013BendixCommercialVehicleSystemsLLC,amemberoftheKnorr-BremseGroup•AllRightsReserved•6/13
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