Bendix Bw2726 Users Manual

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

2015-03-12

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SD-13-47672
Bendix® TABS‑6™ Advanced Multi-Channel Trailer ABS Module
ECU Cover
(Sealed)
Mounting Studs

Wheel Speed
Sensor
Connectors

12-Pin Connector

Part Number
Etched Here
For Port
Descriptions
See Page 3

ECU Connector Covers
on Both Sides
(Removable)

Cover Lock
with Slide Lock
Tab

For Part Label Information
See Page 40

7-Pin
Connector Mounting Studs

Wheel Speed
Sensor
Connectors

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 multichannel (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:
● A modular 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
definable 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

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, fittings, etc. must be of equivalent
size, type and strength as original equipment and
be designed specifically 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 specifically 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.
2

● A wide 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.
● A pressure-equalizing valve in the sealed ECU housing
to give improved protection from water, etc.
● A serviceable nylon filter to help prevent foreign material
from entering the control port.
● Locking dust covers to provide electrical connector and
cable protection.

3/8" NPT Load Port 42
For Air Suspension
(Plugged for Non-Air Suspension or
Spring Suspension Sensor Vehicles)

3/8" NPT Control Port
with Integral Filter

21
21

22
22

Two 3/8" NPT Delivery
Ports 21
(To Brake Chambers)

3/8" NPT Delivery
Port 21
(to Brake Chambers)

3/8" NPT Delivery
Port 22
(to Brake Chambers)

Two 3/8" NPT Delivery
Ports 22
(To Brake Chambers)

1/2" NPT Supply
Port 1

FIGURE 2 - ports used

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 configuration 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 configured 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
benefits 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.
3

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, traffic or weather
conditions, over-steering, an excessively high vehicle
Center of Gravity (CG), poor road conditions, or
insufficient 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 specific 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 configured for a mechanical spring deflection
sensor, a voltage reading that is proportional to the
spring deflection.

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. 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 configured,
external spring deflection 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 fixed 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.

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.
Sensor
Clamping
Sleeve
Acceptable
Logo-Stamped
Sleeves

90° Speed
Sensors

Note: Do Not Use
Previous WSS
Clamping Sleeves
That Have “BW”
in a Diamond

Straight Speed
Sensors

FIGURE 3 - Bendix® WS-24™ WHEEL SPEED SENSORS
FIGURE 4
- typical
external
load SENSOR
installation

Mounting
Bolts

Rubber
Link and
Rod

Load Sensor
Vertical Linkage Rod
Adjustable Linkage
with Rubber Link
Axle Attachment
Bracket
Axle Strap-Style
Fastener Clamp

• 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.

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 deflection sensor is installed — typically as close
to the center (±5 inches) as possible of an axle with

FIGURE 5 - trailer-mounted ABS indicator lamp
5

12-Pin
ECU
Connector
(Harness - K025593)

4-Pin SAE J1939 (CAN)
(Diagnostic)

Pigtail Harness
6-pin Auxiliary

12-Pin
ECU
Connector

(Harness - K027758)

12-Pin
ECU
Connector
4-Pin Sensor
Harness

(Harness - K048989)

4-Pin SAE J1939 (CAN)
(Diagnostic)
12-Pin ECU Connector
4-Pin Sensor
Harness

(Harness - K048988)

4-Pin SAE J1939 (CAN)
(Diagnostic)

(Harness - K025594)

12-Pin ECU Connector

Pigtail Harness
6-pin Auxiliary

5-Pin Power and
Indicator
Lamp (POWER/
Indicator Lamp)

7-Pin ECU Connector
X1 Power Harness (K022146)

To ECU

Wheel Speed Sensor
Extension Harness
(6000365)

FIGURE 6 - examples of Pigtail wire harnesses

• 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 configured
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.
6

To WS-24™ Wheel
Speed Sensor

• Lift Axle Control: The Bendix® TABS‑6™ Adv MC can
be configured to automatically raise (and lower) lift
axle(s) when a pre-configured load is sensed.
• Load Sensor: If a trailer is equipped with an external
electrical spring deflection sensor, See Figure 3, a
linkage is attached to an axle (but must not be installed
on a lift axle) — within 5 (five) 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

deflection. 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 weathersealed 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.

N/A

Ignition Power PLC

(Blue Wire)

Brake Light Power
(Red Wire)

Ground

(White Wire)

Indicator Lamp

(White/Green Wire)

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 deflection sensor for mechanical spring
suspensions.

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 fit
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 configurations 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.

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 fixed axle. For
2S/2M systems, the fixed 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 fit 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.

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.

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.
FIGURE 7 - POWER LINE WITHOUT PLC SIGNAL

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
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
A TABS‑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.

12-Pin
ECU
Conn.

Auxiliary Functions

Auxiliary
Type

(X2)
Aux I/O 1
(AuxIO1)
Aux I/O 2
(AuxIO2)
Aux I/O 3
(AuxIO3)

High-Side Driver
Digital Input
High-Side Driver
Digital Input
High-Side Driver
Digital Input

Output
Input
Output
Input
Output
Input

AuxRet 12

Low-Side Driver

Output

AuxRet 3

Low-Side Driver

Output

Sens_Sup

+5V Sensor Supply

Output

Sens_In

Analog Input

Input

Sens_Gnd

Low-Side Driver

Input

CHART 3 – Auxiliary I/Os

Bendix® ACom® diagnostic software (version 6.1 and
higher) supports the configuration of the TABS‑6 Adv MC
module auxiliary I/Os.
9

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 field, to control
non-braking functions of the trailer.
For example, the ABS Flex program can potentially com‑
municate the status of: tire inflation 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 configuration.

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.
10

Power
Application

ABS System
Status Indicators

1.0 2.0 3.0 4.0 5.0 6.0 (sec.)

Trailer-mounted ABS
Indicator Lamp

Dash-mounted Trailer
ABS Indicator Lamp
(PLC Detected)*

Dash-mounted Trailer
ABS Indicator Lamp
(PLC Not Detected)

OFF

OFF
ON
OFF

*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.

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 powerup 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 outof-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 configured, the TABS‑6
Adv MC module can flash the indicator lamp when the
vehicle is at standstill to indicate when the service interval
has been exceeded.

17. NON-STANDARD TIRE SIZE

19. Partial ABS Shutdown

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 specification for
correct values.

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.

™

The tone ring size is defaulted to 100 teeth, and the tirerolling 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 realigned). 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.

ECU Diagnostic Trouble Codes
All ABS functions are completely disabled. The system
reverts to normal braking.

Voltage Diagnostic Trouble Code
The operating voltage range is 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 specific 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 specific number of times shown in Chart 5, for
the desired mode.
Cycles to Enter Desired Mode
Mode

Cycles

Active DTC Retrieval

Inactive DTC Retrieval (DTC History)

Clear Active DTCs

Odometer Mileage Display

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.

Wait until after the modulator chuff test before activating
the brake light power. Alternatively, wait five (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 five 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 first 15
seconds of ignition power being applied.
If brake light power is continuously applied for greater than
five 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 five (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 five (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 five (5) times within 15 seconds.
Following activation, there will be a five (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.
12

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 five (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
configured 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-inflate 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 configured 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.

22. Diagnostic Trouble Codes (DTCs)
1st 2nd Diagnostic Code
Digit Digit Description
1

No diagnostic codes

Possible Causes / Repair Information

J1587
(SID/
FMI)

J1939
(SPN/
FMI)

• The Bendix® TABS‑6™ Adv MC module system is fully operational –
no diagnostic codes are detected.

000/00

001/00

789/00

002/00

790/00

003/00

791/00

Wheel Speed Sensors (WSS); “S-C”, “S-D”, “S-E”, “S-F”
2

Large Air Gap:
Sensor “S-C”

Large Air Gap:
Sensor “S-D”

Large Air Gap:
Sensor “S-E”

Large Air Gap:
Sensor “S-F”

004/00

792/00

Shorted or open
wire:
Sensor “S-C”

001/03
001/04

789/03
789/04

Shorted or open
wire:
Sensor “S-D”

002/03
002/04

790/03
790/04

Shorted or open
wire:
Sensor “S-E”

003/03
003/04

791/03
791/04

Shorted or open
wire:
Sensor “S-F”

004/03
004/04

792/03
792/04

Dynamic Issue:
Sensor “S-C”

001/08
001/01
001/02

789/08
789/01
789/02

Dynamic Issue:
Sensor “S-D”

002/08
002/01
002/02

790/08
790/01
790/02

Dynamic Issue:
Sensor “S-E”

003/08
003/01
003/02

791/08
791/01
791/02

Dynamic Issue:
Sensor “S-F”

004/08
004/01
004/02

792/08
792/01
792/02

Tire Diameter Out of
Range:
Sensor “S-C”

001/13

789/13

Tire Diameter Out of
Range:
Sensor “S-D”

002/13

790/13

Tire Diameter Out of
Range:
Sensor “S-E”

003/13

791/13

Tire Diameter Out of
Range:
Sensor “S-F”

004/13

792/13

Dynamic Wheel Speed Sensor DTC - large air gap between sensor
and tone ring.
Go to Section E on Page 38.

Static Wheel Speed Sensor DTC - shorted or open sensor wire.
Go to Section E on Page 38.

Dynamic Wheel Speed Sensor DTC - incorrect wheel speed signal
detected while vehicle is in motion.
Go to Section E on Page 38.

• Verify the correct tire size as desired.
• Verify the proper tire inflation.
• 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.

Diagnostic Trouble Codes (DTCs) (continued)
1st 2nd Diagnostic Code
Digit Digit Description

Possible Causes / Repair Information

J1587
(SID/
FMI)

J1939
(SPN/
FMI)

251/03

3597/03

Trailer Power
6

Over-voltage

Power Supply DTC - trailer power above 32 volts.
Go to Section D on Page 37.

Low-voltage

Power Supply DTC - trailer power below 8 volts.
Go to Section D on Page 37.

251/04

3597/04

Excessive power
line resistance

Power Supply DTC - possible corroded or shorted trailer power circuit.
251/13
Go to Section D on Page 37.

3597/13

Pressure Sensors (Internal): “P4”, “P42”, & “P21”, "P22" & "P1"
• Verify the trailer’s control (service) pressure is < 130 psi.
7

Internal Pressure
Sensor Range:
Control Port “P4”

Internal Pressure
Sensor Range:
Load Port “P42”

• 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.
• See the suspension manufacturer’s specifications for load versus
pressure. Verify that the trailer’s air suspension pressure is <130 psi
and is within the allowable range for the specific suspension/airbag
combination. [below 50% of airbag pressure at the unladen weight, or
above 50% of airbag pressure at GVWR for axles]

077/12

1067/12

069/12

1059/12

059/12

1049/12

062/12

1052/12

151/12

1086/12

099/14

1809/14

• 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.

Internal Pressure
Sensor Range:
Delivery Port “P21”

Internal Pressure
Sensor Range:
Delivery Port “P22”

Internal Pressure
Sensor Range:
Supply Port “P1”

•P
erform 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.
• 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.
Lateral Acceleration Sensor

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 configured 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.

Diagnostic Trouble Codes (DTCs) (continued)
1st 2nd Diagnostic Code
Digit Digit Description

Possible Causes / Repair Information

J1587
(SID/
FMI)

J1939
(SPN/
FMI)

099/14

1809/14

099/02

1809/02

099/14

1809/14

099/14

1809/14

• 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.
8

Lateral Acceleration
Sensor - Signal Out
Of Range

• 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 flat 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.
• 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.

Internal Lateral
Acceleration Sensor
- Offset Error

• 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 flat 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.
•V
erify 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.

Lateral Acceleration
Sensor - Sensor
Signal Not Found

• If the ECU has been configured 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.
• Check for corroded/damaged wiring or connectors between the ECU
and the external lateral acceleration sensor.

External Lateral
Acceleration Sensor
Signal Not Available

• 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.

Diagnostic Trouble Codes (DTCs) (continued)
1st 2nd Diagnostic Code
Digit Digit Description

Possible Causes / Repair Information

J1587
(SID/
FMI)

J1939
(SPN/
FMI)

057/07

1047/07

057/07

1047/07

057/07

1047/07

Trailer System Braking

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.
• Check for corroded/damaged wiring or connectors between the ECU
and the WSS.
•C
heck 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.

ABS Plausibility
Error - Excessive
ABS Activity

• Verify the condition of the sensor head.
• Verify the condition and retention power of the clamping sleeve.
•V
erify 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.

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.

Diagnostic Trouble Codes (DTCs) (continued)
1st 2nd Diagnostic Code
Digit Digit Description

Possible Causes / Repair Information

J1587
(SID/
FMI)

J1939
(SPN/
FMI)

254/12

629/12

254/13

629/13

254/13

629/13

254/13

629/13

254/14

629/14

TABS‑6 Adv MC module
• Check for damaged or corroded connectors.
• Check for damaged wiring.
10

TABS‑6 Adv MC
Internal Error

TABS‑6 Adv MC
Configuration Error

• 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.
• 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 configuration data.

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 configuration data.

TABS‑6 Adv MC Not
Configured

• Re-program the ECU to be compatible to the actual system
configuration using the Bendix® ACom® diagnostic software (version
6.1 or higher).
• If necessary, contact your local Bendix representative to obtain the
correct configuration data.

TABS‑6 Adv MC
EOL Test Not
Completed

•P
erform the Installation Test using the Bendix® ACom® diagnostic
software (version 6.1 or higher), or Bendix® Trailer Information
Module.

Diagnostic Trouble Codes (DTCs) (continued)
1st 2nd Diagnostic Code
Digit Digit Description

Possible Causes / Repair Information

J1587
(SID/
FMI)

J1939
(SPN/
FMI)

152/12

612/12

152/12

612/12

152/12

612/12

152/12

612/12

Auxiliary Design Language (ADL) & Auxiliary I/Os
• 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.
11

Auxiliary I/O Error –
AUX WL (#7)

– 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.
• 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.

Auxiliary I/O Error –

 Correctly wired to the auxiliary device (Pin X2-1 – supply, pin X2-11
– ground)

AUX I/O #1

 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.
• 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.

Auxiliary I/O Error –
AUX I/O #2

 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.
• 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.

Auxiliary I/O Error –
AUX I/O #3

 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.

Diagnostic Trouble Codes (DTCs) (continued)
1st 2nd Diagnostic Code
Digit Digit Description
11

Auxiliary Electrical
Error #4
Auxiliary Program
Error – ADL

Possible Causes / Repair Information

J1587
(SID/
FMI)

J1939
(SPN/
FMI)

152/12

612/12

152/12

612/12

152/01

612/01

152/14

612/14

153/00

612/00

069/13

1059/13

070/01

1060/01

254/11

1086/11

254/11

0/11

69/13

0/13

• Clear diagnostic codes.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the TABS‑6 Adv MC module.
• 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.
• Check if the trailer’s service reservoir pressure is < 75 psi
(5.2 bar).

Low Supply
Pressure

WL (Indicator Lamp)
Information – ADL

• 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.
• 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.
Miscellaneous

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.
• If trailer is equipped with a raise/lower valve, verify it is in the drive
position.

Trailer Load Out of
Range

• 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.

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.
• Check if the trailer’s service reservoir pressure is < 65 psi
(4.5 bar).

Low System
Pressure, P1

• 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.

Trailer Information
Module Missing

• Trailer Information Module and/or harness damaged or not present.
Mechanical Load Sensor

Load 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.

Troubleshooting
Using hand-held or

Bendix® Trailer Remote Diagnostic
Unit (TRDU™) Tool (802162)

pc-based diagnostics
Troubleshooting and Diagnostic Trouble Code (DTC)
clearing, as well as beginning a reconfiguration, 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.

LED lights
illuminate
Diagnostic
Trouble Codes
(10 LEDs)

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 configuration

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 specifically
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.

• Perform system and component tests

To Towing
Vehicle
J560
Connector

• 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.

To Trailer
Connector

Adapter
(802165)

FIGURE 12 - TRDU™ tool and adapter

The TRDU tool communicates across PLC.

Lap Top Computer

The TRDU tool allows the technician to:

USB Cable

J2497 (PLC)
or J1939

Noregon
Adapter

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.
20

• 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.

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 flash 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 first DTC by illuminating the red LEDs,
indicating the malfunctioning ABS component and its
location on the vehicle. (See Figure 13.)

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 sufficient.)
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

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

Example: If the DTC
is "Right Additional
Sensor", the TRDU™ tool
will display one green
and three red LEDs

MOD3 -
LFT -
RHT -
ADD -
ODO -

Modulator 3
Left
Right
Additional
Odometer

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 benefit 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 configuration
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.

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 first, 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 first time, additional troubleshooting
may be necessary.

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 (1-800247-2725), 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.
21

To better serve you, please record the following
information before you call the Bendix Tech Team, or
include this information in your e-mail:

REMOVING THE TABS‑6 Adv MC module

• Bendix product model number, part number and
configuration.

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 configuration.

• Vehicle make and model.
• Vehicle configuration. (Number of axles, tire size, etc.)
•

System performance symptoms: When do they occur?

• What DTCs have been identified 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 deflection sensor installation (where used).
• Correct location of the wheel speed sensors.
• Configuration 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 configuration
to the desktop. (After the module has been replaced,
the technician can restore the previous configuration
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.
22

1. Open the end covers by sliding the locking tabs to the
left. If the module is to be reinstalled, retain the covers.

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 filter in the control port (See Figure 2).
This filter 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 filter is found
to be damaged, install a replacement. The filter 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
specifically 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 configuration to the desktop. The technician
can use ACom diagnostics to restore the previous
configuration 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.

1. The TABS‑6 Adv MC module shall be installed with the
following considerations (see Figures 16 through 18):

5°

• 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 verified
using Bendix ACom diagnostic software (version
6.1 or higher).

Vertical
Orientation
(Roll Angle)
Must be
within Five
Degrees of
Vertical

• Yaw angle shall be ± 10° as measured from the
center line of the trailer.
• Pitch angle shall be ± 10° as measured from a flat
horizontal plane.
• Roll angle shall be within ± 5° as measured from a
flat 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).

FIGURE 16 - Installation on trailer (vertical)
10°

Longitudinal
Orientation
(Pitch Angle)
Must be within
Ten Degrees of
Vertical

10°

Driving
Direction

2. Reconnect all air hoses and plugs to the module.
Depending on the installation, additional plugs may
be necessary. Thread sealant products that contain
Teflon 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 fittings 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.

FIGURE 17 - Installation on trailer (longitudinal)
± 40" (1 m) from mid-point between the axles

10°
10°

± 2" (5 cm)
from center
of trailer

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 configured for an offset).
FIGURE 18 - Installation on trailer (center line)

Note: The wheel speed sensors must follow the orienta‑
tion of the module as shown in Figure 19 for fixed 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 fix 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.

With exhaust port facing downward and unobstructed
with significant free space below (> 1 inch).

2. Fully charge the air brake system and verify proper
brake adjustment.

• Within ± 40" of the center of the axle(s) for proper
balanced brake applications.

3. Make several trailer brake applications and check for
prompt application and release at each wheel.

•

0° Mounting Orientation

180° Mounting Orientation

Right - “Curb Side”
Sensor
“S-D”

Sensor
“S-F”

Sensor
“S-C”

P21

P22

Vehicle Driving
Direction

P22

Sensor
“S-E”

P21

Sensor
“S-D”

Sensor
“S-C”

Sensor
“S-F”

Left - “Road Side”

FIGURE 19 - Wheel speed sensor installation

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:
24

• ECU Information: This test provides the user with
specific 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 configured.
• 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 predefined limits (+/-5 degrees). This test
verifies 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.

• Mechanical Load Sensor Test (Mechanical
Spring Ride): The test has the user verify the
expected measurement of the spring deflection
sensor. The program provides the reading of the
sensor.
• Customer Scratch Pad: The tester is requested
to input data into the fields displayed on the screen.
This data will be stored in the ECU and also can be
stored to a file 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 chafing 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.

NOT USED

TRAILER-MOUNTED
ABS INDICATOR
LAMP

Rear Dump Control
Relay and ATC Valve
(Optional)

Lift Bag
Pressure
Switch
(Optional)

Load
Sensor
(Optional)

IGNITION VOLTAGE
BRAKE LAMP VOLTAGE
NOT USED
ABS INDICATOR LAMP (AUX I/O 7)
GROUND

NOT USED
NOT USED

4
5

NOT USED

NOT USED
NOT USED
SENSOR “S-C” (+)
SENSOR “S-C” (-)

SENSOR “S-C”

AUX I/O 1
AUX I/O 2
AUXILIARY I/O 3

NOT USED

7-PIN
CONNECTOR

2
3

NOT USED
6
NOT USED

SENSOR SUPPLY
SENSOR INPUT
SENSOR GROUND
NOT USED
NOT USED
SAE J1939 (H)
SAE J1939 (L)
AUX I/O RETURN 1 & 2
AUX I/O RETURN 3

4-PIN CONNECTORS

Bendix® Trailer
Information Module:
G2 (OPTIONAL)

NOT USED
3
NOT USED

S-F

1
2
3
4
5
6
7
8
10
9
11
12

1
2

NOT USED

TRAILER-MOUNTED
ABS INDICATOR
LAMP

SENSOR
“S-F”

1
2

Lift Bag
Pressure
Switch
(Optional)

Load
Sensor
(Optional)

1
85

NOT USED
NOT USED

NOT USED

NOT USED
NOT USED
NOT USED

7-PIN
CONNECTOR

SENSOR “S-E”

SENSOR “S-C”

1
2
1
2

1
2
3
4
5

NOT USED
NOT USED

NOT USED 6
NOT USED 7

AUX I/O 1
AUX I/O 2
AUXILIARY I/O 3

SENSOR SUPPLY
SENSOR INPUT
SENSOR GROUND
NOT USED
NOT USED
SAE J1939 (H)
SAE J1939 (L)
AUX I/O RETURN 1 & 2
AUX I/O RETURN 3

4-PIN CONNECTORS
7

IGNITION VOLTAGE
BRAKE LAMP VOLTAGE
NOT USED
NOT USED
ABS INDICATOR LAMP (AUX I/O 7)
GROUND
Rear Dump Control
Relay and ATC Valve
(Optional)

Bendix® Trailer
Information Module:
G2 (OPTIONAL)

SENSOR “S-F” (+)
SENSOR “S-F” (-)

SENSOR “S-E” (+)
SENSOR “S-E” (-)
SENSOR “S-C” (+)
SENSOR “S-C” (-)

Figure 21 - Bendix TABS‑6 adv MC module electrical schematic - 4s/2M
26

S-F

1
2
3
4
5
6
7
8
10
9
11
12

1
2

TABS‑6 advanced MC module ECU

X1 “POWER”

X2 “IN-OUT”

5-PIN PACKARD
CONNECTOR

SENSOR “S-D” (+)
SENSOR “S-D” (-)

S-E

SENSOR “S-D”

S-C

7-WAY SAE J560 CONNECTOR

S-D

Figure 20 - Bendix® TABS‑6™ adv MC module electrical schematic - 2s/2M

TABS‑6 advanced MC module ECU

A
E

NOT USED
NOT USED

X1 “POWER”

X2 “IN-OUT”

S-E

5-PIN PACKARD
CONNECTOR

SENSOR “S-D” (+)
SENSOR “S-D” (-)

SENSOR “S-D”

S-C

7-WAY SAE J560 CONNECTOR

S-D

Troubleshooting: Electrical Schematics

Troubleshooting: System Schematics
2S/2M - SIDE CONTROL - Fixed Axles
0 Degree Mounting Orientation
Ground

Brake Lamp Power

Bendix® WS-24™ Wheel Speed Sensor
“S-D”

Air Bellow
(where used)

A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
5-Pin ABS
Connector

Ignition
Power

7-Pin SAE J560
Connector

Right - “Curb-Side”

Load Sensor
(where used)

Trailer ABS Pigtail Harness

Trailer Chassis Harness

P21

Control Line

Bendix®
TABS‑6™
Advanced
Multi-Channel

Supply Line
Bendix®
SR-5™ Trailer
Spring Brake
Valve

P22

ABS Indicator Lamp
Semi-Trailer Tandem Axle Trailer

Left - “Road-Side”

“S-C”
Bendix® WS-24™ Wheel Speed Sensor

Figure 22 - Bendix® TABS‑6™ adv MC module - 2s/2m side control (0 degree) ABS electrical & air system

2S/2M - SIDE CONTROL - Fixed Axles
180 Degree Mounting Orientation
Right - “Curb-Side”
Ground

Ignition
Power
Brake Lamp Power
7-Pin SAE J560
Connector

A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground

Bendix® WS-24™ Wheel Speed Sensor

Air Bellow
(where used)
“S-C”

5-Pin ABS
Connector

Trailer Chassis Harness

Trailer ABS Pigtail Harness
P22

Control Line
Supply Line

Bendix®
SR-5™ Trailer
Spring Brake
Valve

Bendix®
TABS‑6™
Advanced
Multi-Channel

P21

ABS Indicator Lamp
Semi-Trailer Tandem Axle Trailer
ABS

Load Sensor
(where used)

“S-D”

Bendix® WS-24™ Wheel Speed Sensor

Left - “Road-Side”
Figure 23 - Bendix TABS‑6 adv MC module - 2s/2m side control (180 degree) ABS electrical & air system
27

Troubleshooting: System Schematics
4S/2M - SIDE CONTROL - Fixed Axles
0 Degree Mounting Orientation Right - “Curb-Side”
Ground

Ignition
Power
Brake Lamp Power
7-Pin SAE J560
Connector

“S-F”

“S-D”

Air Bellow
(where used)

A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
5-Pin ABS
Connector

Trailer Chassis Harness

Bendix® WS-24™ Wheel Speed Sensors

Load Sensor
(where used)

Trailer ABS Pigtail Harness
P21
Bendix®
TABS‑6™
Advanced
MultiChannel

Control Line
Bendix®
SR-5™ Trailer
Spring Brake
Valve

Supply Line

P22

ABS Indicator Lamp
Semi-Trailer Tandem Axle Trailer
“S-E”
“S-C”
Bendix® WS-24™ Wheel Speed Sensors

Left - “Road-Side”

Figure 24 - Bendix® TABS‑6™ adv MC module - 4s/2m side control (0 degree) ABS electrical & air system

4S/2M - SIDE CONTROL - Fixed Axles
180 Degree Mounting Orientation
Ground
Ignition
Power
Brake Lamp Power

7-Pin SAE J560
Connector

A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground

Right - “Curb-Side”
Bendix® WS-24™ Wheel Speed Sensors
Air Bellow
(where used)

“S-C”

“S-E”

5-Pin ABS
Connector

Trailer Chassis Harness

Trailer ABS Pigtail Harness
P22

Control Line
Supply Line

Bendix®
SR-5™ Trailer
Spring Brake
Valve

Bendix®
TABS‑6™
Advanced
Multi-Channel

P21

ABS Indicator Lamp
Semi-Trailer Tandem Axle Trailer

Load Sensor
(where used)

“S-D”

“S-F”

Bendix® WS-24™ Wheel Speed Sensors

Left - “Road-Side”
Figure 25 - Bendix TABS‑6 adv MC module- 4s/2m side control (180 degree) ABS electrical & air system
28

Troubleshooting: System Schematics
4S/2M - AXLE CONTROL - Fixed Axles
Right - “Curb-Side”
0 Degree Mounting Orientation
Ground
Ignition
Power
Brake Lamp Power
7-Pin SAE J560
Connector

Air Bellow
(where used)

A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
Trailer Chassis Harness

Bendix® WS-24™ Wheel Speed Sensors
“S-F”

“S-D”

5-Pin ABS
Connector
Trailer ABS
Pigtail
Harness

Control Line

P21

Supply Line

Bendix®
TABS‑6™
Advanced
Multi-Channel
P22

Bendix®
SR-5™ Trailer
Spring Brake
Valve

ABS Indicator Lamp
Semi-Trailer Spread Axle Trailer

Load Sensor
(where used)
“S-E”

Left - “Road-Side”

“S-C”
Bendix® WS-24™ Wheel Speed Sensors

Figure 26 - Bendix® TABS‑6™ adv MC module - typical 4s/2m axle control ABS electrical & air system

4S/2M - AXLE CONTROL - Fixed Axles
180 Degree Mounting Orientation
Ground
Ignition
Power
Brake Lamp Power
7-Pin SAE J560
Connector

Right - “Curb-Side”
Bendix® WS-24™ Wheel Speed Sensors
Air Bellow
(where used)

A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
5-Pin ABS
Connector
Trailer Chassis Harness

“S-C”

“S-E”

Trailer ABS Pigtail Harness

Control Line

P22

Supply Line

Bendix®
SR-5™ Trailer
Spring Brake
Valve

P21

Bendix®
TABS‑6™
Advanced
Multi-Channel

ABS Indicator Lamp
Semi-Trailer Tandem Axle Trailer

Load Sensor
(where used)

“S-D”

“S-F”

Bendix® WS-24™ Wheel Speed Sensors

Left - “Road-Side”
Figure 27 - Bendix TABS‑6 adv MC module - 4s/2m axle control (180 degree) ABS electrical & air system
29

Troubleshooting: System Schematics
4S/2M - SIDE CONTROL - Front Lift Axle
0 Degree Mounting Orientation

Dashed-line box
Shows Lift Axle

Right - “Curb-Side”

Ground
A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground

Ignition
Power
Brake Lamp Power
7-Pin SAE J560
Connector

Bendix® WS-24™ Wheel Speed Sensors
“S-F”

“S-D”

Air Bellow
(where used)

Load Sensor
(where used)

5-Pin ABS Connector
Trailer ABS Pigtail Harness

Trailer Chassis Harness

P21

Control Line

Bendix®
TABS‑6™
Advanced
MultiChannel

Supply Line
Bendix®
SR-5™ Trailer
Spring Brake
Valve

P22

ABS Indicator Lamp
“S-E”

Semi-Trailer Tandem Axle Trailer
Lift Axle

Left - “Road-Side”

“S-C”

Bendix® WS-24™ Wheel Speed Sensors

Figure 28 - 4s/2m side control (0 degree) with front lift axle, ABS electrical & air system

4S/2M - SIDE CONTROL - Rear Lift Axle
0 Degree Mounting Orientation

Right - “Curb-Side”

Ground
Ignition
Power
Brake Lamp Power
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
5-Pin ABS
Connector

Trailer Chassis Harness

Load Sensor
(where used)

“S-D”

“S-F”

Dashedline box
Shows
Lift Axle

Air Bellow
(where used)

Trailer ABS Pigtail Harness
P21

Control Line

Bendix®
TABS‑6™
Advanced
MultiChannel

Supply Line
Bendix®
SR-5™ Trailer
Spring Brake
Valve

P22

ABS Indicator Lamp
“S-C”

Semi-Trailer Tandem Axle Trailer

“S-E”

Lift Axle

Left - “Road-Side”

Bendix® WS-24™ Wheel Speed Sensors

Figure 29 - 4s/2m side control (0 degree) with rear lift axle, ABS electrical & air system
30

Troubleshooting: System Schematics
4S/2M - SIDE CONTROL - Front Lift Axle
180 Degree Mounting Orientation
Ground
Ignition
Power

A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground

Brake Lamp
Power
7-Pin
SAE J560
Connector
Control
Line

Right - “Curb-Side”
Dashed-line box
Shows Lift Axle

Bendix® WS-24™ Wheel Speed Sensors

Air Bellow
(where used)
“S-E”

“S-C”

5-Pin ABS
Connector

Trailer Chassis Harness

Trailer ABS Pigtail Harness
P22

Supply
Line

Bendix®
SR-5™ Trailer
Spring Brake
Valve

Bendix®
TABS‑6™
Advanced
MultiChannel

P21

ABS Indicator Lamp
Load Sensor
(where used)

Semi-Trailer Tandem Axle Trailer

“S-F”

“S-D”

ABS

Left - “Road-Side”

Lift Axle

Bendix® WS-24™ Wheel Speed Sensors

Figure 30 - 4s/2m side control (180 degree) with front lift axle, ABS electrical & air system

Right - “Curb-Side”

4S/2M - SIDE CONTROL - Rear Lift Axle
180 Degree Mounting Orientation
Ground

Ignition
Power
Brake Lamp
Power
7-Pin
SAE J560
Connector
Control
Line

Bendix® WS-24™ Wheel Speed Sensors

A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground

Dashedline box
Shows
Lift Axle

Air Bellow
(where used)
“S-C”

“S-E”

5-Pin ABS
Connector

Trailer Chassis Harness

Trailer ABS Pigtail Harness
P22

Supply
Line

Bendix®
SR-5™ Trailer
Spring Brake
Valve

Bendix®
TABS‑6™
Advanced
MultiChannel

P21

ABS Indicator Lamp
Load Sensor
(where used)

Semi-Trailer Tandem Axle Trailer

“S-D”

“S-F”

Lift Axle

Left - “Road-Side”

Bendix® WS-24™ Wheel Speed Sensors

Figure 31 - 4s/2m side control (180 degree) with rear lift axle, ABS electrical & air system
31

Troubleshooting: System Schematics
4S/2M - AXLE CONTROL - Front Lift Axle
180 Degree Mounting Orientation
Ground

Brake Lamp Power
7-Pin SAE J560
Connector

Trailer Chassis Harness

Bendix®
WS-24™
Wheel Speed
Sensors
“S-E”

Air Bellow
(where used)

A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
5-Pin ABS
Connector

Ignition
Power

Right - “Curb-Side”
Dashed-line box
Shows Lift Axle

“S-C”

Trailer ABS Pigtail Harness
P22

Control Line
Supply Line

Bendix®
SR-5™ Trailer
Spring Brake
Valve

Bendix®
TABS‑6™
Advanced
MultiChannel

P21

ABS Indicator Lamp
Semi-Trailer Spread Axle Trailer

Load Sensor
(where used)

“S-F”

Lift Axle

“S-D”
Bendix® WS-24™
Wheel Speed
Sensors

Left - “Road-Side”

Figure 32 - 4s/2m axle control (180 degree) with front lift axle, ABS electrical & air system

Right - “Curb-Side”

4S/2M - AXLE CONTROL - Rear Lift Axle
180 Degree Mounting Orientation
Ground
Ignition
Power
Brake Lamp Power
7-Pin SAE J560
Connector

Air Bellow
(where used)

A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
5-Pin ABS
Connector

Trailer Chassis Harness

Dashed-line box
Shows Lift Axle

“S-C”

Bendix®
WS-24™
Wheel Speed
Sensors

“S-E”

Trailer ABS Pigtail Harness

Control Line

P22

Supply Line

Bendix®
SR-5™ Trailer
Spring Brake
Valve

P21

Bendix®
TABS‑6™
Advanced
MultiChannel

ABS Indicator Lamp
Semi-Trailer Spread Axle Trailer

Load Sensor
(where used)
Lift Axle

“S-D”

Bendix® WS-24™
Wheel Speed
Sensors

Left - “Road-Side”

Figure 33 - 4s/2m axle control (180 degree) with rear lift axle, ABS electrical & air system
32

“S-F”

Troubleshooting: System Schematics
4S/2M - AXLE CONTROL - Front Lift Axle
0 Degree Mounting Orientation
Ground

Brake Lamp Power

Right - “Curb-Side”
Bendix® WS-24™
Wheel Speed
Sensors

Air Bellow
(where used)

A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground

Ignition
Power

7-Pin SAE J560
Connector

Dashed-line box
Shows Lift Axle

“S-D”

“S-F”

5-Pin ABS
Connector
Trailer ABS
Pigtail
Harness

Trailer Chassis Harness

Control Line

P21

Supply Line

Bendix®
TABS‑6™
Advanced
Multi-Channel
P22

Bendix®
SR-5™ Trailer
Spring Brake
Valve

ABS Indicator Lamp
Semi-Trailer Spread Axle Trailer

Load Sensor
(where used)

“S-E”

Lift Axle

Bendix® WS-24™
Wheel Speed
Sensors

“S-C”

Left - “Road-Side”
Figure 34 - Bendix TABS‑6 adv MC module - typical 4s/2m System with front lift axle
®

™

4S/2M - AXLE CONTROL - Rear Lift Axle
0 Degree Mounting Orientation
Ground
Ignition
Power
Brake Lamp Power
7-Pin SAE J560
Connector
Control Line

Dashed-line box
Shows Lift Axle
Bendix® WS-24™
Wheel Speed
Sensors

Air Bellow
(where used)

A Brake Lamp Power
B Ignition Power
C NC
D Indicator Lamp
E Ground
5-Pin ABS
Connector
Trailer Chassis Harness

Right - “Curb-Side”

“S-D”

“S-F”

Trailer ABS
Pigtail
Harness

Supply Line

P21
Bendix®
TABS‑6™
Advanced
Multi-Channel

Bendix®
SR-5™ Trailer
Spring Brake
Valve

P22

ABS Indicator Lamp
Semi-Trailer Tandem Axle Trailer
Lift Axle

Load Sensor
(where used)

“S-C”

“S-E”
Bendix® WS-24™
Wheel Speed
Sensors

Left - “Road-Side”
Figure 35 - Bendix TABS‑6 adv MC module - 4s/2m axle control System with rear lift axle
33

Troubleshooting: Flowcharts
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 flowcharts will help the technician isolate
the cause and confirm whether the problem resides in the
component, wiring or connectors.

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.

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

No voltage or resistance measurements are to be made
on the bulkhead connector pins of the module.

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

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

Does
the
trailer-mounted
ABS indicator lamp
immediately illuminate when
power is applied to the
trailer?

YES

Troubleshoot
the trailermounted ABS
indicator lamp
circuitry. Go to
Section C

Does the
trailer-mounted ABS
indicator lamp stay “ON” for
6.5 seconds and then
turn “OFF”?

YES
Perform End-of-Line test

Does the
trailer-mounted ABS
indicator lamp stay “ON” for
2.5 seconds and then
turn “OFF”?

YES
The module is functioning normally.
No service to the ABS unit is needed.

Section B: (Power-Up Sequence)
Dash-Mounted ABS Indicator Lamp
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.

Observe the dash-mounted Trailer
ABS Indicator Lamp at Power-Up

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.

Does
the dashmounted ABS
indicator lamp illuminate
within 2 seconds of ignition
power being applied to
the vehicle?

Verify that a PLC signal is present
on the trailer ignition power lines.
(Refer to the PLC Communications
section of this document.)

YES

If a PLC signal is present and the
trailer ABS lamp does not illuminate
at ignition, troubleshoot the dashmounted 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
trailermounted ABS
indicator lamp stay
“ON” for 6.5
seconds and
then turn
“OFF”?
YES
Perform
End-of-Line test

Does
the trailermounted ABS
indicator lamp stay “ON”
for 2.5 seconds
and then turn
“OFF”?

YES
The module is
functioning normally.
No service to the ABS
unit is needed.

Section C: TROUBLESHOOTING THE TRAILER-MOUNTED
ABS INDICATOR LAMP CIRCUITRY

The trailer-mounted ABS indicator
lamp remains “ON” during the powerup sequence.

The trailer-mounted ABS indicator
lamp did not illuminate 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.

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.

If repairs are made, rerun the
power-up sequence. Go to
Section A.
Continue if the indicator lamp and
ground wire check out OK.

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.

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.

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.

YES

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
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.

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).
37

SECTION E: TROUBLESHOOTING THE
Bendix® WS-24™ WHEEL SPEED SENSORS (WSS)
Turn off the power to the module, disconnect
the wheel speed sensor connector.

If Dynamic WSS DTCs are present:

If Static 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.

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.

Note: Both Static and Dynamic WSS DTCs may be present:

S-D and S-F Sensor
(See Figure 19 for Usage.)
38

S-F

S-E

S-D

S-C

S-C and S-E Sensor
(See Figure 19 for Usage.)

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:

For air 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 flipped
over so that it faces the opposite direction.

1. Check that port P42 is connected by an
unkinked air hose to the primary suspension air
bags.

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 five (5) and
between pins five (5) and six (6). Using Bendix
ACom Diagnostics open the configuration
screen, then the Load and Sensor Configuration
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 configuration
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 specific
suspension\air bag combination to find the expected
values for this vehicle.
Then rerun the power up sequence. Go to Section A.

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 “Configuration” screen; then
the Load and Sensor Configuration 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 configuration
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 specific
suspension\air bag combination to find the expected
values for this vehicle.
Then rerun the power up sequence. Go to Section A.
39

ECU Part Number Label

Software Revision Level

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). A Bendix
manufacturing date code is to the right of the part number
inscription.

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.

There is an additional label under one of the covers that
shows a pin-out diagram for the 12-pin auxiliary connector.

Document Revision Level
Please visit Bendix.com to ensure you have the latest
version of this document.

Bendix Part Number

Production
Data

K123456
K987654Vxx

YYWWDAAAAYYWWDXXXXXXXX

Knorr-Bremse 03

Mxxx
X

Component
ID

Final 8 Digits
Show Initial
Software
Loaded

Figure 36 - Label information

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