Bendix Bw2718 Users Manual

Bendix-Sd-13-47671-Users-Manual-682594 bendix-sd-13-47671-users-manual-682594

2015-03-12

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SD-13-47671
Bendix® TABS‑6™ Advanced Single-Channel Trailer ABS Module
Through-holes for Frame
(Chassis) Mounting

ECU Cover
(Sealed)

ECU Connector
Cover
(Removable)

3/8" NPT Load Port
(Air Suspension)
3/4" NPT Supply Port
with Integral Filter

ECU Part Number
Label
(See Page 34)

18-Pin Connector

Wheel Speed
Sensor
Connectors

3/8" NPT Control Port
with Integral Filter
Integrated
Modulator
Relay Valve

Four (4) 3/8" NPT
Delivery Ports
(To Brake Chambers)

To Remove Cover Slide
Lock Tab

FIGURE 1 - TABS‑6 Advanced single-channel module (TABS‑6 Adv) plus view of connector

1. INTRODUCTION
The Bendix® TABS‑6™ Adv module is an integrated singlechannel (2S/1M) 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 Valve (MRV) — eliminating external pigtail
harnesses for these components.
● An operating voltage range of 8 - 32 volts.
● Optional mounting to the service reservoir or to the chassis,
without additional brackets.
● 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.

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

● An extended data logging feature, including a resettable
drive recorder.
● 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.
● Serviceable nylon filters to help prevent foreign material
from entering the control port, load port and supply port.
● Locking dust cover 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

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

3/4" NPT Supply
Port 1

FIGURE 2 - ports used

3. ANTILOCK BRAKE SYSTEM
(ABS) OPERATION
The Bendix® TABS‑6™ Adv module uses wheel speed
sensors, modulator relay valve (MRV); 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 intervening on regular traction road surfaces, a
system configured for axle control performs similar to a
side control, two-modulator system.

When a situation is detected where the system needs to
intervene, the ECU will activate the MRV to apply controlled
brake pressure at the wheel ends.

The Bendix® TABS‑6™ Adv 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 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.

The TABS‑6 Adv 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 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.

Axle Control
Axle control uses the modulator relay valve to control the
wheels at both ends of a given axle (or multiple axles in
cases where the MRV is controlling several axles).

ABS Fail-Safe

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.
3

4. Bendix® TRAILER ROLL STABILITY
PROGRAM (TRSP®) OPERATION
WARNING! During a Bendix ® TRSP ® system
intervention, the vehicle automatically decelerates.
The TABS‑6 Adv 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 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 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 module. This
sensor detects the lateral motion (or “roll”) of the
vehicle as it moves. The TABS-6 Adv module may
be mounted either in line with or at right angles to
the main trailer chassis 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 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
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 module use the following
components:

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.

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 pressure modulator
valve 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 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.
• 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 Sensor: This sensor (P21)
monitors the trailer service brake pressure that is being
delivered to the wheel ends through, or by, the TABS‑6
Adv module system and sends an electrical signal
directly proportional to the delivered trailer service
brake pressure to the ECU.
• Modulator Relay Valve (MRV): An MRV is integrated
into the module and is controlled electrically by the
ECU to decrease, hold, or allow the full applied brake
pressure into the brake chamber to control the braking
torque at the wheels.

External:

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.

• 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
linkage attached to the center of the axle (but must

FIGURE 5 - trailer-mounted ABS indicator lamp
5

18-Pin ECU Connector
5-Pin Power and
Indicator
Lamp (POWER/WL)

4-Pin SAE J1939 CAN
(Optional)

Pigtail Harness
6-pin Auxiliary
(Optional)

18-Pin ECU Connector

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

4-Pin SAE J1939 CAN
(Optional)
18-Pin ECU Connector
5-Pin Power and
Indicator
Lamp (POWER/WL)

4-Pin SAE J1939 CAN

To ECU
Wheel Speed Sensor
Extension Harness

To WS-24™ Wheel
Speed Sensor

FIGURE 6 - examples of Pigtail wire harnesses

• Pigtail Wiring Harness: A power pigtail harness is
required, variations that include auxiliary sub-harnesses
are available, as needed. See Figure 6.

• Lift Axle Control: The Bendix® TABS‑6™ Adv can be
configured to automatically raise (and lower) lift axle(s)
when a pre-configured load is sensed.

• 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.

• 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 an auxiliary sub-harness (part of the
power harness). See Figure 6.

6. MOUNTING configurations

Auxiliary I/O Connector

Tank (Nipple) Mount

The TABS‑6 Adv module pigtails provide an option for up
to four auxiliary I/Os and two active sensor inputs.

The TABS-6 Advanced module can be tank-mounted using
a schedule 80 (heavy gauge steel) 3/4” NPT nipple directly
between the trailer supply tank and the module’s supply
port. A tank with a reinforced port must be used.

Examples of uses of the auxiliary connector are:
•

Lift axle sensing.

•

Rear axle suspension air bag dump.

Frame (Chassis) Mount

•

Automatic lift axle control.

The TABS-6 Advanced module provides through-holes for
frame mounting directly to the trailer frame rail or crossmember. It is recommended to use two Grade 5 3/8‑16 bolts,
typical length 5”, torqued to 180-220 in-lbs.

•

External spring deflection sensor for mechanical spring
suspensions.

POWER AND GROUND

7. PIGTAIL WIRING HARNESSES
Several pigtail wire harnesses are available to connect
the TABS-6 Advanced module with ABS and other trailer
system components. Pigtail harness are weather sealed
at the connector interface and are clearly labeled for
proper installation. Because of the over-molded design of
the TABS‑6 Advanced module wiring harnesses, Bendix
recommends that the complete harness be replaced if
damage or corrosion occurs.
TABS-6 Advanced modules include the two primary wheel
speed sensor connections and therefore these are separate
from the pigtail harness.

ECU Connectors
TABS-6 Advanced module ECU connectors use an 18-pin
Deutsch DT series connector for brake light power, constant
power, ground, the trailer-mounted ABS indicator lamp and
auxiliary I/O’s.

Power/ABS Indicator Lamp Connector
The TABS-6 Advanced module pigtail uses a TTMA
RP 7‑99 5-pin Packard Weather Pack connector for brake
light power, constant power, ground and the trailer-mounted
ABS indicator lamp.

Trailer electrical power is supplied to the TABS‑6 Adv
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
Ignition Power PLC

(Blue Wire)

Brake Light Power
(Red Wire)

Ground

(White Wire)

Indicator Lamp

(White/Green Wire)

7-Pin
Trailer
Conn.

5-Pin
ABS
Conn.

18-Pin
ECU
Conn.

N/A

CHART 2 – Power and Ground

The Power/ABS indicator lamp lead of the pigtail harness
is available in several lengths to satisfy most installation
requirements (e.g. slider axles).

SAE J1939 (CAN) Connector
See Figure 6.
TABS-6 Advanced module pigtail harnesses provide a 4‑pin
connection for various ECU communications. Typical uses
include J1939 diagnostics, and connection to the Bendix®
Trailer Information Module.

8. ABS INDICATOR LAMP
Trailer-mounted Lamp
The Bendix ® TABS‑6 ™ Adv 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 18-pin connector on the module.
Dash-mounted Lamp (PLC Controlled)
TABS‑6 Adv 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 6 of the 18-pin
module connector.
If there is an active DTC, during the bulb check at start‑up,
the TABS‑6 Adv 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 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 module ECU. The
signal varies in voltage and frequency as the wheel speed
changes.
See Figure 20 for an electrical system schematic showing
wheel speed sensor connector pin locations.

CAUTION: Correct wheel speed sensor installation is
necessary for optimal ABS operation.
Sensors should not be installed on a lift axle.
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 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 module.
Ignition power must be provided to the TABS‑6 Adv module
for the diagnostic link to be active.
FIGURE 7 - POWER LINE WITHOUT PLC SIGNAL

12. AUXILIARY I/O
The TABS‑6 Adv 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 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 module.
PLC communication is applicable for 12-volt vehicle
applications only. The PLC communication is disabled for
voltages greater than 18 volts.

AUX1

AUX2

AUX4

AUX6

GND12
GND6
SEN1

Identifying and Measuring the PLC Signal
A TABS‑6 Adv 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 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.

ECU
Auxiliary Functions
Pin

SEN2

Auxiliary Type

High-Side Driver

Output

Digital Input

Input

High-Side Driver

Output

Digital Input

Input

High-Side Driver

Output

Digital Input

Input

High-Side Driver

Output

Digital Input

Input

Low-Side Driver

Output

Low-Side Driver

Output

+5V Sensor Supply

Output

Analog Input

Input

Ground

Input

+5V Sensor Supply

Output

Analog Input

Input

Ground

Input

CHART 3 – Auxiliary I/Os

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

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 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 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 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 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 module activates a modulator
chuff test. This electrical and pneumatic ABS modulator
test can help the technician identify problems with modula‑
tor 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 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 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 module is towed using a pre1997 tractor (with no constant power supplied to the trailer),
no information about mileage will be stored during that
time, and the mileage can be considered out-of-calibration.

Trip Counter
The TABS‑6 Adv 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 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 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 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 rpm’s

80 teeth

512 to 801 rpm’s

90 teeth

456 to 711 rpm’s

100 teeth

410 to 640 rpm’s

120 teeth

356 to 502 rpm’s

CHART 4 – Tone ring size to tire rolling radius

18. Diagnostic trouble
code DETECTION
The TABS‑6 Adv module contains self-testing diagnostic
circuitry that monitors the ABS components and wiring.
When the TABS‑6 Adv 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 module also uses PLC communications to send the
system status to the towing vehicle.
For some trouble codes, the TABS‑6 Adv 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 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 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 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 13-17 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 13-17 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 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 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)

• TABS-6 Advanced system fully operational – no diagnostic codes
detected

000/00

001/00

789/00

002/00

790/00

001/03
001/04

789/03
789/04

002/03
002/04

790/03
790/04

001/08
001/01
001/02

789/08
789/01
789/02

002/08
002/01
002/02

790/08
790/01
790/02

001/13

789/13

002/13

790/13

Wheel Speed Sensors (WSS); “S-C” & “S-D”
2

Large Air Gap:
Sensor “S-C”

Large Air Gap:
Sensor “S-D”

Dynamic Issue:
Sensor “S-C”

Dynamic Issue:
Sensor “S-D”

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

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

Dynamic Wheel Speed Sensor DTC - large air gap between sensor
and tone ring.
Go to Section E, Dynamic Wheel Speed Sensor DTC, on Page 31.

Shorted or open wire:
Sensor “S-C”
Static Wheel Speed Sensor DTC - shorted or open sensor wire.
Shorted or open wire: Go to Section E, Static Wheel Speed Sensor DTC, on Page 31.
Sensor “S-D”
Dynamic Wheel Speed Sensor DTC - incorrect wheel speed signal
detected while vehicle is in motion.
Go to Section E, Dynamic Wheel Speed Sensor DTC, on Page 31.
• Verify correct tire size and proper tire inflation.
• Verify correct number of exciter/tone ring teeth.
• Verify that the TABS-6 Advanced ECU has been programmed with
the proper tire size and tone ring settings.
Trailer Power

Over-voltage

Power Supply DTC - trailer power above 32 volts.
Go to Section D on Page 30.

251/03

3597/03

Low-voltage

Power Supply DTC - trailer power below 8 volts.
Go to Section D on Page 30.

251/04

3597/04

Excessive power line
resistance

Power Supply DTC - possible corroded or shorted trailer power
circuit. Go to Section D on Page 30.

251/13

3597/13

077/12

1067/12

069/12

1059/12

059/12

1049/12

Pressure Sensors (Internal): “P4”, “P42”, & “P21”

Internal Pressure
Sensor Reading
Incorrect:
Control Port “P4”

Internal Pressure
Sensor Reading
Incorrect:
Load Port “P42”

• Verify the trailer’s control (service) pressure is < 130 psi.
• After repairs — or if no issues are found — clear the diagnostic
code.
• If the diagnostic code persists, contact your local Bendix
representative before replacing the Bendix® TABS‑6™ Adv 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]
• 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 module.
• Perform a Pressure Component Test using the Bendix® ACom®
diagnostic software (version 6.1 or higher).

Internal Pressure
Sensor Reading
Incorrect:
Delivery Port “P21”

• 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 module.

Diagnostic Trouble Codes (DTCs) (continued)
1st
Digit

Diagnostic
Code
Description

Possible Causes / Repair Information

J1587
(SID/
FMI)

J1939
(SPN/
FMI)

Internal Lateral
Acceleration
Sensor Mounting Error

• Before troubleshooting, verify that the trailer has been parked on level
ground.
• Verify that the TABS-6 Advanced ECU has been programmed with the
proper ECU orientation, tire size and tone ring settings.
• Verify that the TABS-6 Advanced module has been mounted as per the
Installation Guidelines (See Troubleshooting Section G, page 33):
- The configured ECU orientation matches the actual ECU
orientation.
- Verify that wheel speed sensors are installed correctly (left/right)
(See Figure 19)
• After repairs or if no issues are found, then clear diagnostic codes.
• If diagnostic code persists, contact the BCVS local representative before
replacing the TABS-6 Advanced module.

099/14

1809/14

Internal Lateral
Acceleration
Sensor - Signal
Out Of Range

• Before troubleshooting, verify that the trailer has been parked on level
ground.
• Verify that the TABS-6 Advanced module has been mounted as per the
Installation Guidelines.
• Perform a Lateral Acceleration Sensor (installation angle) Component
Test using the Bendix® ACom® Diagnostic Software (version 6.1 or
higher):
- Verify the roll angle of the TABS-6 Advanced module is within ±5° as
measured from a flat horizontal plane.
• 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 module.

099/14

1809/14

Internal Lateral
Acceleration
Sensor - Offset
Error

• Before troubleshooting, verify that the trailer has been parked on level
ground.
• Verify that the TABS-6 Advanced module has been mounted as per the
Installation Guidelines.
• Perform a Lateral Acceleration Sensor (installation angle) Component Test
using the Bendix® ACom® Diagnostic Software (version 6.1 or higher).
- Verify the roll angle of the TABS-6 Advanced 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, then clear the diagnostic codes.
• If diagnostic code persists, contact the BCVS local representative before
replacing the TABS-6 Advanced module.

099/02

1809/02

• Verify that the TABS-6 Advanced module has been mounted as per the
Installation Guidelines:
Internal Lateral - TABS-6 Advanced module mounted either in 0°, 90°, 180° or 270°
orientation.
Acceleration
Sensor - Sensor • If the ECU has been configured for an external lateral acceleration sensor:
Signal Not
- Check for corroded/damaged wiring or connectors between the ECU
Found
and the external lateral acceleration sensor.
- Verify correct wiring between the ECU and the external lateral
acceleration sensor.

099/14

1809/14

• Check for corroded/damaged wiring or connectors between the ECU and
the external lateral acceleration sensor.
• Verify correct wiring between the ECU and the external lateral
acceleration sensor.
• After repairs or if no issues are found, then clear the diagnostic codes.
• If diagnostic code persists, replace the external lateral acceleration
sensor.

099/14

1809/14

2nd
Digit

Lateral Acceleration Sensor (Internal or External)

External Lateral
Acceleration
- Signal Not
Found

Diagnostic Trouble Codes (DTCs) (continued)
1st
Digit

2nd
Digit

Diagnostic
Code
Description

Possible Causes / Repair Information

J1587
(SID/
FMI)

J1939
(SPN/
FMI)

057/07

1047/07

057/07

1047/07

057/07

1047/07

254/12

629/12

Trailer System Braking

Extended Brake
Application
Detected

Excessive ABS
Activity Detected

• Verify that there is no residual pressure in the trailer’s control (service)
line.
• 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 module.
Dynamic Wheel Speed Sensor DTC - possible incorrect wheel speed
signal while vehicle in motion resulted in long ABS event.
Go to Section E on Page 31.

• Clear diagnostic codes.
Excessive TRSP • If diagnostic code persists:
Activity Detected - Contact the BCVS local representative before replacing the TABS-6
Advanced module.
TABS-6 Advanced Module (TABS-6 Adv)

TABS-6
Advanced
Internal Error

• Check for damaged or corroded connectors.
• Check for damaged wiring.
• 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 module.

TABS-6
Advanced
Configuration
Error

• Verify the ECU parameters and actual system installation is compatible
using the Bendix® ACom® Diagnostic Software (version 6.1 or higher).
• Re-program ECU as necessary.
• If necessary, contact the BCVS local representative to obtain the correct
configuration data.

254/13

629/13

TABS-6
Advanced
EEPROM Error

254/13

629/13

• 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 the BCVS local representative to obtain the correct
configuration data.

254/13

629/13

• Perform the Installation Test using the Bendix® ACom® Diagnostic
Software (version 6.1 or higher), or Trailer Information Module.

254/14

629/14

152/12

612/12

TABS-6
Advanced Not
Configured
TABS-6
Advanced
EOL Test Not
Completed

Auxiliary Design Language (ADL) & Auxiliary I/O’s

TABS-6
Advanced
Auxiliary I/O
Error:
AUX I/O #7
(Trailer ABS
Indicator Lamp)

• Check for corroded/damaged wiring or connectors between the ECU and
the ABS Indicator Lamp.
• Check Pin X1-5 of the ECU ‘Power’ connector for the following:
- Pin not pushed back.
- Correctly wired to the ABS Indicator Lamp (Pin X1-5 – supply).
- Shorted to ground, Vbat or other ECU pins.
• Verify the ABS Indicator Lamp is properly grounded and not burnt out.
• After repairs or if no issues are found, then clear the diagnostic codes.
• If diagnostic code persists, contact the BCVS local representative before
replacing the TABS-6 Advanced module.

Diagnostic Trouble Codes (DTCs) (continued)
1st
Digit

2nd
Digit

Diagnostic
Code
Description

TABS-6
Advanced
Auxiliary I/O
Error:
AUX I/O #1

TABS-6
Advanced
Auxiliary I/O
Error:
AUX I/O #2

TABS-6
Advanced
Auxiliary I/O
Error:
AUX I/O #4

TABS-6
Advanced
Auxiliary I/O
Error:
AUX I/O #6

Possible Causes / Repair Information

J1587
(SID/
FMI)

J1939
(SPN/
FMI)

• Check for corroded/damaged wiring or connectors between the ECU and
the auxiliary device.
• Check Pins X1-14 & X1-15 of the ECU ‘Power’ connector for the
following:
- Pins not pushed back.
- Correctly wired to the auxiliary device (Pin X1-14 to supply, Pin X1-15 to
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, then clear the diagnostic codes.
• If diagnostic code persists, contact the BCVS local representative before
replacing the TABS-6 Advanced module.

152/12

612/12

• Check for corroded/damaged wiring or connectors between the ECU and
the auxiliary device.
• Check Pins X1-8 & X1-15 of the ECU ‘Power’ connector for the following:
- Pins not pushed back.
- Correctly wired to the auxiliary device (Pin X1-8 – supply,
Pin X1-15 – 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, then clear the diagnostic codes.
• If diagnostic code persists, contact the BCVS local representative before
replacing the TABS-6 Advanced module.

152/12

612/12

• Check for corroded/damaged wiring or connectors between the ECU and
the auxiliary device.
• Check Pin X1-3 of the ECU ‘Power’ connector for the following:
- Pin not pushed back.
- Correctly wired to the auxiliary device (Pin X1-3 – supply).
- 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, then clear the diagnostic codes.
• If diagnostic code persists, contact the BCVS local representative before
replacing the TABS-6 Advanced module.

152/12

612/12

• Check for corroded/damaged wiring or connectors between the ECU and
the auxiliary device.
• Check Pins X1-2 & X1-13 of the ECU ‘Power’ connector for the following:
- Pins not pushed back.
- Correctly wired to the auxiliary device (Pin X1-2 – supply,
Pin X1-13 – 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, then clear the diagnostic codes.
• If diagnostic code persists, contact the BCVS local representative before
replacing the TABS-6 Advanced module.

152/12

612/12

Diagnostic Trouble Codes (DTCs) (continued)
1st
Digit

2nd
Digit

Diagnostic
Code
Description
TABS-6
Advanced
Auxiliary
Program Error:
ADL

WL Information:
ADL

Possible Causes / Repair Information

J1587
(SID/
FMI)

J1939
(SPN/
FMI)

• 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 the BCVS local representative to troubleshoot the
ADL program.

152/12

612/12

• Verify that the ADL parameters are correct using the Bendix® ACom®
Diagnostic Software (version 6.1 or higher).
• If necessary, contact the BCVS local representative to troubleshoot the
ADL program.

152/14

612/12

153/00

612/00

069/13

1059/13

070/01

1060/01

254/11

0/11

69/13

0/13

Miscellaneous
12

• Perform scheduled trailer maintenance and/or reset the Service Distance
Service
Distance or Date or Date using the Bendix® ACom® Diagnostic Software (version 6.1 or
Exceeded
higher).

Trailer Load Out
of Range

Brake Pads
Worn

Trailer
Information
Module Missing

• If trailer is equipped with a raise/lower valve, verify it is in the drive
position.
• Verify that the ECU parameters for the empty and fully loaded trailer
conditions are correct using the Bendix® ACom® Diagnostic Software
(version 6.1 or higher).
• If necessary, contact the BCVS local representative to troubleshoot the
trailer’s loading condition.
• 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.
• 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 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 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 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.
18

• 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 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
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.

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 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 module is connected to the J1939 5V TI (CAN)
connection of the auxiliary connector which supplies the
necessary information.

Figure 15 - Trailer Information module
Additional support at

www.bendix.com
For the latest information, and for free downloads of literature
and the Bendix® ACom® diagnostics software, and its User
Guide, visit the Bendix website at www.bendix.com.

Bendix Technical Assistance Team
For direct personal technical support, call the Bendix
technical assistance team at 1-800-AIR-BRAKE (1-800247-2725), 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.
19

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 module

• Bendix product model number, part number and
configuration.

2. Disconnect the 18-pin ECU connector and the two 2-pin
wheel speed sensor connectors.

• 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 module

CAUTION: Special considerations need to be
taken to ensure that the Bendix® TABS‑6™ Adv 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 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 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 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 module's mounting position on
the vehicle.

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

3. Mark for reinstallation and then remove all air hoses
connected to the TABS-6 Adv module.
4. Remove the Advanced module from the vehicle by
removing the mounting fasteners or by rotating the
entire assembly counter-clockwise from the tank mount.

servicing the control port filter
CAUTION! The TABS-6 Advanced 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 module
CAUTION! All service replacement parts for
the Bendix ® TABS‑6 ™ Adv module are configured
specifically by part number.
As mentioned during the Servicing the Bendix TABS‑6
Adv 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 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 Grade-5 3/8-18 bolts, nuts and
lock washers for the frame-mount unit, or a schedule 80
(heavy gauge steel) ¾” nipple for the tank-mount unit.
Inspect the location selected for installation and clean as
necessary.
NOTE: Inspect all components, including the replace‑
ment TABS‑6 Adv 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 module shall be installed with the
following considerations (see Figures 16 through 18):

5°

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

FIGURE 16 - Installation on trailer (vertical)
10°

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

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).

• 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.

For tank-mount modules: Install the nipple fitting into
the modulator-valve supply port. Then rotate the entire
assembly into the tank port until secure. Over-torquing
of the tank nipple could cause damage to the valve
body.

For frame-mount modules: Torque the mounting nuts
to 180-220 in-lbs.

10°

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.

Driving
Direction

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

3. Reconnect the ECU power, auxiliary if present and
wheel speed sensor electrical connectors to the ECU.
Apply a moderate amount of non-conductive electrical
grease to each connector pin before reconnecting.

Note: The wheel speed sensors must follow the orienta‑
tion of the module as shown in Figure 19 for fixed axle
trailers.
• It is necessary to fix the wheel speed sensors to
the orientation of the lateral acceleration sensor for
plausibility checks between the sensors.

10°
10°

•

± 2" (5 cm)
from center
of trailer

The TABS‑6 Adv 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).

• If the wheel sensor location does not match the
orientation of the Bendix® TABS‑6™ Adv module
shown in Figure 19, a Diagnostic Trouble Code
(DTC) will be generated and the ABS indicator lamp
will be illuminated.
• Refer to the large label inside the connector cover
for wheel speed designation, “S-C” and “S-D”.
4. Leakage and Operational Tests must be performed
before returning the vehicle to service.

FIGURE 18 - Installation on trailer (center line)

•

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

• Within ± 40" of the center of the axle(s) for proper
balanced brake applications.
21

Vehicle Driving Direction
Sensor
“S-D”

Sensor
“S-D”

Sensor
“S-C”

Right - “Curb Side”

Sensor
“S-C”

TABS
ADV
TABS
ADV

Sensor
“S-C”
0° Orientation
(Top-View)

Sensor
“S-C”

Sensor
“S-D”

90° Orientation
(Top-View)

180° Orientation
(Top-View)

Sensor
“S-D”
270° Orientation
(Top-View)

Left - “Road Side”

FIGURE 19 - Wheel speed sensor installation

LEAKAGE AND OPERATIONAL TESTS

5. Apply power and monitor the power-up sequence to
verify proper system operation. See Section 15.

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

6. Calibrate and set odometer parameters, if necessary,
using a diagnostic tool. See Section 16.

1. Before performing the leakage tests, block the wheels.

3. Make several trailer brake applications and check for
prompt application and release at each wheel.
4. Check the TABS‑6 Adv module, modulator valve 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 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 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 module.

7. Perform an installation test using a diagnostic tool.
Minimum tests that are required to verify the proper
installation of the ABS/TRSP system are:
• ECU Information: This test provides the user with
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.

ABS WIRING

• 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.

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.

• 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.

All connector leads of the Bendix® TABS‑6™ Adv module
pigtail harness are weather sealed at the connector
interface and are clearly labeled for proper installation.

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.

Troubleshooting: Electrical Schematics
7-WAY SAE J560
CONNECTOR

GROUND
IGNITION VOLTAGE
BRAKE LAMP VOLTAGE

Load
Sensor
(Optional)
Trailer-Mounted ABS
INDICATOR LAMP

ABS INDICATOR LAMP (AUX I/O 7)
SENSOR SUPPLY 2
NOT USED 4

Lift Axle
Control Valve
Solenoid
(Optional)
2
1

NOT USED
NOT USED

SENSOR INPUT 1
AUX I/O 4
AUXILIARY GROUND 1 & 2
SENSOR GROUND 1

4-PIN Connector

Bendix® Trailer
Information Module
(OPTIONAL)

NOT USED

SENSOR INPUT 2

NOT USED

SENSOR SUPPLY 1

SENSOR GROUND 2

AUXILIARY I/O 2

AUXILIARY I/O 1

SAE J1939 (H)

SAE J1939 (L)

DIAGNOSTIC GROUND

6-PIN Connector

DIAGNOSTIC VOLTAGE (AUX 6)

NOT USED
NOT USED
NOT USED

SENSOR “S-C”

4-PIN
Connector

Figure 20 - Bendix® TABS‑6™ Adv module electrical schematic - 2s/1M

SENSOR “S-C” (+)
SENSOR “S-C” (-)

1
2

18
6
12
5
11
17
9
3
15
10
4
16
8
14
7
1
13
2

1
2

TABS‑6 advanced module ECU

SENSOR “S-D” (-)

X1 “ECU”

SENSOR “S-D” (+)

S-C

S-D

SENSOR “S-D”

Troubleshooting: System Schematics
2S/1M - AXLE CONTROL - Fixed Axles
0 Degree Mounting Orientation
7-Pin SAE J560
Connector
Ground
Ignition
Power

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

Right - “Curb-Side”

5-Pin ABS
Connector

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

Air Bellow
(where used)

Brake Lamp Power
Trailer Chassis Harness

Trailer ABS Pigtail Harness
Bendix®
SR-5™ Trailer
Spring Brake
Valve

Control Line
Bendix®
TABS‑6™
Advanced
Multi-Channel

Supply Line

ABS Indicator Lamp
Load Sensor
(where used)

Semi-Trailer Tandem Axle Trailer

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

Left - “Road-Side”

Figure 22 - Bendix® TABS‑6™ Adv module - 2s/1m axle control (0 degree) ABS electrical & air system

2S/1M - AXLE CONTROL - Front Lift Axle
Right - “Curb-Side”
0 Degree Mounting Orientation
7-Pin SAE J560
Connector
Ground
Ignition
Power

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

5-Pin ABS
Connector

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

Air Bellow
(where used)

Brake Lamp Power
Trailer Chassis Harness

Trailer ABS Pigtail Harness
Bendix®
SR-5™ Trailer
Spring Brake
Valve

Control Line
Bendix®
TABS‑6™
Advanced
Multi-Channel

Supply Line

ABS Indicator Lamp
Load Sensor
(where used)

Semi-Trailer Tandem Axle Trailer

Left - “Road-Side”

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

Figure 23 - Bendix® TABS‑6™ Adv module - 2s/1m axle control (0 degree) with front lift axle, ABS
electrical & air system
25

Troubleshooting: System Schematics
2S/1M - AXLE CONTROL - Rear Lift Axle
Right - “Curb-Side”
0 Degree Mounting Orientation
7-Pin SAE J560
Connector
Ground
Ignition
Power

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

5-Pin ABS
Connector

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

Air Bellow
(where used)

Brake Lamp Power
Trailer Chassis Harness

Trailer ABS Pigtail Harness
Bendix®
SR-5™ Trailer
Spring Brake
Valve

Control Line
Bendix®
TABS‑6™
Advanced
Multi-Channel

Supply Line

ABS Indicator Lamp
Load Sensor
(where used)

Semi-Trailer Tandem Axle Trailer

Left - “Road-Side”

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

Figure 24 - Bendix® TABS‑6™ Adv module - 2s/1m axle control (0 degree) with rear lift axle, ABS
electrical & air system

Troubleshooting: Flowcharts
Diagnostic trouble code information can be retrieved
from the Bendix® TABS‑6™ Adv 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.

electrical measurements, always begin by taking voltage
and resistance measurements at the 18‑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 module's power-up sequence. If it is necessary to take

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 27
Section B: (Power-Up Sequence) Dash-Mounted ABS Indicator Lamp . . . . . . . . . . . . . . . Page 28
Section C: Troubleshooting the Trailer-Mounted ABS Indicator Lamp Circuitry . . . . . . . Page 29
Section D: Troubleshooting the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 30
Section E: Troubleshooting the WS-24™ Wheel Speed Sensors . . . . . . . . . . . . . . . . . . . . Page 31
Section F: Troubleshooting the Load Sensor (Out-of-Range Condition) . . . . . . . . . . . . . Page 32
Section G: Troubleshooting the ECU and Wheel Speed Sensor . . . . . . . . . . . . . . . . . . . . Page 33

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.
27

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 did not illuminate during the
power-up sequence.

The trailer-mounted ABS indicator
lamp remains “ON” during the
power‑up sequence.

Determine if a module Diagnostic Trouble
Code (DTC) exists using any of the following
methods:

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 18) to the ground pin of
the indicator lamp.

•

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 18-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.

With power off to the ABS
module, disconnect the 18-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.

Looking into the Bendix® TABS‑6™
Adv Module 18-pin Connector Pigtail
Harness.
18

Pin 18 is the ground pin.
Pin 5 is the ABS indicator lamp pin.
29

SECTION D: TROUBLESHOOTING THE
POWER SUPPLY
Turn off the power to the module,
disconnect the 18-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 6) and Ground
(pin 18) of the ECU connector.
Repeat the voltage measurement
with brake lamp power to the trailer,
between the Brake Lamp Power
(pin 12) and the Ground (pin 18) of
the ECU connector.
The operating range of the module
is 8.0-32.0 VDC. Verify that the
voltage drop measurements are no
less than 1.0 VDC from the vehicle
voltage at both the ignition and
brake power inputs.

With a volt/ohm meter, check
the power and ground wiring. Look
for corroded or damaged wires or
connectors.
If repairs are made, rerun the
power-up sequence. Go to
Section A.
If proper loaded and unloaded
voltage is measured at the ECU
connector, and no corrosion or
damage is found on the wiring,
connectors or ECU, replace the
module.

With
ignition
power to the
trailer, measure
the voltage between
the ignition Power pin and the
Ground pin of the ECU connector.
YES

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 module
Wire Harness, ECU Connector Measure:
Pin 6 (Ignition Power) to Pin 18 (ground)
and Pin 12 (Brake Light Power) to
Pin 18 (ground).

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:
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:

If Static WSS DTCs are present:
Using a volt/ohm meter to measure the connector
pins of the sensor with a DTC, verify 950-1950
OHMS across the sensor connector pins.
Verify/inspect the following:
•

No continuity from sensor connector pins to
ground.

The condition and retention force of the sensor
sleeve.

•

Vbat not measured at either sensor connector
pins.

•

Proper sensor lead condition, routing and
clamping sleeve.

•

Verify there is no continuity between the sensor
leads and other sensors.

•

Condition of tone ring mounting and teeth.

•

Proper number of tone ring teeth per sensed
wheel.

Sensor/ECU wiring and connectors are not
damaged or corroded.

•

Proper sensor wire routing and clamping.

•

Proper adjustment of wheel bearings.

•

Condition of foundation brakes.

Make repairs as needed (replace wiring and/or ABS
components).

•

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

•

Speed sensors properly contact the tone ring.

•

Reset active DTC’s by using any of the following
methods:
•

Blink Code Diagnostics, Section 20.

•

PC diagnostics, Section 23.

Reset active DTC’s by using any of the following
methods:

•

Bendix Remote Trailer Diagnostic Unit (TRDU)
and magnet, Section 23.

•

Blink Code Diagnostics, Section 20.

•

Bendix® Trailer Information Module, Section 23.

•

PC diagnostics, Section 23.

•

Bendix Remote Trailer Diagnostic Unit (TRDU)
and magnet, Section 23.

Then check for Dynamic WSS DTCs, see left
column.

•

Bendix® Trailer Information Module, Section 23.

Make repairs as needed (replace wiring and/or ABS
components).

Then rerun the power up sequence. Go to Section A.

(If you do not reset manually, typically these will reset
automatically after a power cycle and the vehicle has
been driven for a period of time.)
Then rerun the power up sequence. Go to Section A.

Note: Both Static and Dynamic WSS DTCs may be present:
S-C Sensor
(See Figure 19 on
Page 22 for Usage.)

S-D Sensor
(See Figure 19 on
Page 22 for Usage.)
Looking into TABS-6 Advanced module Wire Harnesses
31

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 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.
3. Where the value does not appear to be correct,
perform the load sensor resistance check:
•
•

•

Unplug the 18-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 nine (9) and between
pins nine (9) and ten (10). Using Bendix ACom
Diagnostics open the configuration screen. Select
the Load and Sensor Configuration tab, and then
view the “Load Sensing” panel. Verify that the
current “Sensing Type” is shown as “External.” If
not, change the selection to “External.”
Note the values shown on the screen for the current
load and sensor voltage. 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. Where possible, obtain the load/deflection curve
from the suspension/spring manufacturer for the specific
suspension/spring 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
pressure value is not as expected, open the
“Configuration” screen; then select the Load and
Sensor Configuration tab, and then view 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 pressures are correct.
Where the value does not appear to be correct,
select “modify”, and 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.

SECTION G: TROUBLESHOOTING THE ECU and wheel speed sensor
(Note: The indicator lamp for this condition is illuminated only after the vehicle moves.)
Turn off the power to the module.

1. Check that the Electronic Control Unit (ECU) is installed correctly (expected orientation to vehicle).
Each Bendix® TABS-6™ Advanced ECU comes preconfigured for a certain orientation (0/90/180/270 degrees from
the vehicle driving direction). See the Figure below. Use Bendix® ACom® Diagnostics software to view the current
configured orientation of the Bendix TABS-6 Advanced ECU on the controller configuration screen. Then use the
Figure below to verify that the TABS-6 Advanced ECU is installed per the configured orientation. If it is determined
that the ECU is not installed per the configured orientation, then verify that the configured orientation is correct for
the part number of the ECU. This will require contacting a Bendix representative at 1-800-AIR-BRAKE (1-800-2472725). If the configured orientation matches the orientation for the specific ECU part number then reinstall the ECU
to match the configured orientation. After reinstalling the ECU for the correct orientation perform an End-of-Line Test
(installation test) using Bendix ACom Diagnostic software or a Bendix® Trailer Information Module.
If the configured orientation of the ECU does not match the orientation for the specific part number, it is possible
that the configured orientation was manually configured using Bendix ACom Diagnostic software at a previous date.
If possible, change the configured orientation back to the correct orientation for the given part number. This may
require assistance from a Bendix representative at 1-800-AIR-BRAKE (1-800-247-2725). After reconfiguring the
orientation of the ECU, reinstall per the new orientation if required. Perform an End-of-Line Test (installation test).
2. Check if the wheel speed sensors SC and SD are swapped.
Since this Diagnostic Trouble Code (DTC) is caused by the ECU comparing the difference in wheel speed readings
between left and right wheel speed sensors to cross-check with the on-board lateral accelerometer’s data, if the
sensors are reversed, a DTC can be triggered. The correct installation location of wheel speed sensors SC and SD
are specific to the ECU’s orientation. Each TABS-6 Advanced ECU comes preconfigured for a certain orientation.
Use Bendix ACom Diagnostics software to view the orientation on the controller configuration screen. Then use
the Figure below to verify the correct installation of wheel speed sensors for this orientation. Use Bendix ACom
Diagnostics software to run the TABS‑6 Advanced End-of-Line Test (installation test) to verify if the installation of
wheel speed sensors SC and SD is correct.

Right - “Curb Side”

TABS
ADV
TABS
ADV

Bendix Part Number

K004243
Date of Manufacture Code

YYWWDAAAAYYWWD XXXXXXXX

Final 8 Digits
Show Initial
Software
Loaded

AXXX

Knorr-Bremse 00 A
Figure 36 - Label information

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 18-pin main connector.

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

NOTES

Log-on and Learn from the Best

On-line training that's available when you are — 24/7/365.
Visit www.brake-school.com.

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