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2014-12-12

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SD-13-4767
Bendix® TABS-6 Trailer ABS Module
ECU Cover
(Sealed)

3/8" NPT Control
Port with
Integral Filter

The ECU Connector
Varies for Standard and
Premium - See Chart

ECU Connector
Cover
(Removable)

Integrated
Modulator
Relay Valve

3/4" NPT
Supply Port

ECU Pin-out Label
(See Page 31)

Wheel Speed
Sensor
Connectors
Through-holes
for Frame
(Chassis)
Mounting
Four (4) 3/8" NPT
Delivery Ports
(To Brake Chambers)

Part Number
Label
(See Page 31)

FIGURE 1 - TABS-6 standard and Premium MODULeS

INTRODUCTION
The Bendix® TABS-6 module is an integrated trailer ABS
controller and modulator for air-braked heavy-duty trailers,
semi-trailers and dollies. The module acts as a relay valve
during normal braking, but during ABS events, it will intervene
to help improve stability. All modules include an Electronic
Control Unit (ECU) and Modulator Relay Valve (MRV) which are
integrated into a single self-contained 2S/1M (two-sensor, one
modulator) trailer ABS unit. The Premium TABS-6 module is
auto-configurable to control more sensors and modulators (up to
4S/3M) from its default 2S/1M.
Bendix® TABS-6 modules also feature:
• Internal electrical connections to the primary MRV,
eliminating the need for external pigtail harnesses.
• Optional mounting to the service reservoir or to the chassis,
without additional brackets.
• Blink code diagnostics and support for advanced diagnostic
tools.
• Support for Power Line Carrier (PLC) communication to the
towing vehicle.
• A pressure equalizing valve in the sealed ECU housing to
give improved protection from water, etc.
• A locking dust cover to provide additional electrical connector
and cable protection.
• A serviceable nylon filter to help prevent foreign material
from entering the control port.

To Remove Cover
Slide Lock Tab

The Standard TABS‑6
Module uses a
5-Pin Connector

The Premium TABS‑6
Module uses an
18-Pin Connector

TABLE OF CONTENTS
PAGE
General System Information
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safe Maintenance Practices . . . . . . . . . . . . . . . . . . 2
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Mounting Configurations . . . . . . . . . . . . . . . . . . . . . 2
PLC Communications . . . . . . . . . . . . . . . . . . . . . . . 2
Wiring Harness (Pigtail) . . . . . . . . . . . . . . . . . . . . . . 3
Power and Ground . . . . . . . . . . . . . . . . . . . . . . . . . .4
ABS Indicator Lamp . . . . . . . . . . . . . . . . . . . . . . . . . 4
Wheel Speed Sensors . . . . . . . . . . . . . . . . . . . . . . . 5
BR9235™ ABS Modulator Valve . . . . . . . . . . . . . . . . 5
J1708/J1587 Diagnostic Link . . . . . . . . . . . . . . . . . . 6
Auxiliary I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ABS Flex™ Program . . . . . . . . . . . . . . . . . . . . . . . . . 6
Customer Scratch Pad . . . . . . . . . . . . . . . . . . . . . . .6
Power-up Sequence . . . . . . . . . . . . . . . . . . . . . . . . 6
ABS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Auto-Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Odometer Function . . . . . . . . . . . . . . . . . . . . . . . . . 8
Non-standard Tire Size . . . . . . . . . . . . . . . . . . . . . . 8
Diagnostic Trouble Code Detection . . . . . . . . . . . . . 8
Blink Code Diagnostics . . . . . . . . . . . . . . . . . . . . . . 9
Bendix ABS Diagnostic Tools . . . . . . . . . . . . . . . . . 13
Contacting Bendix . . . . . . . . . . . . . . . . . . . . . . . . . 14
Servicing the Module . . . . . . . . . . . . . . . . . . . . . . . 14
Removing the Module . . . . . . . . . . . . . . . . . . . . . . 14
Service Replacement using the Module . . . . . . . . 15
Reinstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Leakage And Operational Tests . . . . . . . . . . . . . . . 15
ABS Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . 17-27

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 an AD-IS® air
dryer system or a dryer reservoir module, be sure
to drain the purge reservoir.
5. Following the vehicle manufacturer’s recommended
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 ® 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 Antilock 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.

COMPONENTS
Installations of the TABS-6 Module typically utilize the
following components:
• Bendix ® WS-24 ™ wheel speed sensors (2 or 4,
depending on configuration). Each sensor is installed
with a Bendix Sensor Clamping Sleeve. See page 5.
• Bendix® BR9235™ Pressure Modulator Valves (0, 1, or
2 depending on configuration). See page 5.
• Trailer-mounted ABS indicator lamp. See page 4.
• Pigtail wiring harness(es) as needed. See page 3.

MOUNTING configurations
Tank (Nipple) Mount
The TABS-6 modules 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.

Frame (Chassis) Mount
The TABS-6 module provides through-holes for frame
mounting directly to the trailer frame rail or cross-member.
It is recommended to use two Grade 5 3/8-16 bolts, typical
length 5", torqued to 180-220 in-lbs.

Power Line carrier (plc)
Communications
Since March 1, 2001, all new towed vehicles transmit a
signal over the power line to an in‑cab trailer ABS Indicator
Lamp. The signal, using a heavy vehicle industry standard
known as “PLC4Trucks,” is typically broadcast by the
trailer ABS ECU over the blue wire (power line) of the J560
connector. See Figures 2 and 3.
TABS-6 modules support PLC communications in accordance with SAE J2497.

Identifying and Measuring the PLC Signal
A TABS-6 module will continuously broadcast PLC
messages that indicate trailer ABS status. At power-up or
during a trailer ABS fault condition, the TABS-6 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 on the power line. For more information on these
diagnostic tools, contact Bendix or refer to your local
authorized Bendix dealer or distributor.
An oscilloscope can also be used to verify the presence
and strength of a PLC signal on the power line. The PLC
signal is an amplitude and frequency modulated signal.
Depending on the load on the power line, the amplitude of
the PLC signal can range from 5.0 mV p-p to 7.0 V p-p.

PIGTAIL WIRING HARNESSes
Several pigtail wire harnesses are available to connect
the TABS-6 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 module wiring harnesses, Bendix recommends that
the complete harness be replaced if damage or corrosion
occurs.
The following connector options may be present:
FIGURE 2 - POWER LINE WITHOUT PLC SIGNAL

Modulator 2 (MOD2), Modulator 3 (MOD3), auxiliary,
diagnostic, and additional axle wheel speed sensors.
Note: All TABS-6 modules include the two primary wheel
speed sensor connections and therefore these are separate
from the pigtail harness.

ECU Connectors
Standard TABS-6 module ECU connectors use a TTMA
97‑99 5‑pin Packard Weather Pack connector for brake
light power, constant power, ground, the trailer-mounted
ABS indicator lamp and a single auxiliary input/output
(I/O).
FIGURE 3 - POWER LINE WITH PLC SIGNAL

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.

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

Premium TABS-6 module ECU connectors use an 18-pin
Deutsch DT series connector for the same function as
above, plus additional modulators, wheel speed sensors
and auxiliary I/O’s.

2-Pin Additional
Wheel Speed
Sensor
Connectors
(SAL & SAR)

18-Pin ECU Connector

3-Pin Modulator 2
(MOD2)
Premium Pigtail Harness
(4S/2M with diagnostic)

4-Pin Diagnostic
Auxiliary
(Optional)
3-Pin Modulator 3
(MOD3) (Optional)

5XXX....

5XXX...

E
D

To BR9235™ ABS Modulator
Relay Valve

To TABS-6 Module
Pigtail
Modulator Extension Harness
To Diagnostic
Tool

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

To TABS-6 Module
Pigtail

Optional
Diagnostic

5-Pin ECU
Connector
Standard Pigtail Harness
(2S/1M) with optional diagnostic

5XXX...

Diagnostic Tool Harness

To ECU or Pigtail

Wheel Speed Sensor
Extension Harness

To WS-24™ Wheel
Speed Sensor

FIGURE 4 - examples of Pigtail wire harnesses available

Power/ABS Indicator Lamp Connector
The TABS-6 module pigtail uses a TTMA RP 97-99 5-pin
Packard Weather Pack connector for brake light power,
constant power, ground and the trailer-mounted ABS
indicator lamp.
The Power/ABS indicator lamp lead of the pigtail harness
is available in several lengths to satisfy most installation
requirements (e.g. slider axles).

Wheel Speed Sensor Connectors
Two 2-pin connectors are provided for additional wheel
speed sensors for 4S ABS applications. These 2-pin
connectors are labeled Additional Sensor Left (SAL), and
Additional Sensor Right (SAR). Extension cables are
available in various lengths from Bendix.

Circuit

Ignition Power

PLC (Blue Wire)
Brake Light
Power

7-Pin
Trailer
Conn.

5-Pin
ABS
Conn.

5-Pin 18-Pin
ECU
ECU
Conn. Conn.

N/A

(Red Wire)

Ground

(White Wire)

Indicator Lamp
(White/green
Wire)

CHART 2 – Power and Ground

ABS Modulator Connectors
On Premium TABS-6 module pigtail harnesses, one or two
modulator connectors are provided for trailers using two
or three modulators. These 3-pin connectors are labeled
MOD2 and MOD3. (Note: MOD1 designates the internal
modulator of the TABS-6 module). Remote modulator
harnesses are available in many lengths to satisfy most
installation requirements.

Diagnostic Connector
Premium TABS-6 module pigtail harnesses provide a 4pin diagnostic connection for a diagnostic tool to monitor
ECU ignition power, ground and data information. Remote
diagnostic cables are available from Bendix to provide a
standard J1708/J1587 diagnostic port at the side of the
trailer.

Auxiliary I/O Connector
Standard TABS-6 module pigtails provide an option for
a single auxiliary I/O. An optional auxiliary connector
provides a connection to the TABS-6 module auxiliary I/O
ECU pins. Premium ECU pigtails provides an option for
up to six auxiliary I/O’s.

ABS INDICATOR LAMP
Trailer-mounted Lamp
The TABS-6 module controls an ABS indicator lamp to show
the trailer ABS status. With power supplied by the towing
vehicle, 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 D
of the 5-pin Standard module connector, and Pin 5 of the
18-pin Premium module connector.
Dash-mounted Lamp (PLC Controlled)

POWER AND GROUND
Trailer electrical power is supplied to the TABS-6 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 16.0 VDC

ECU Active

135 mA @ 12 VDC

ABS Active
(1 Modulator)

3.7 A @ 12 VDC

ABS Active
(2 Modulators)

5.2 A @ 12 VDC

CHART 1 – Values for Outputs

FIGURE 5 - trailer-mounted ABS indicator lamp

TABS-6 modules use SAE J2497 standards to support
Power Line Carrier (PLC) communication. The TABS-6
module transmits a signal over the power line to the towing
vehicle. This information is used by towing vehicle’s
ABS controller to know when to illuminate the trailer ABS
indicator lamp mounted on the dash.
The status of the trailer ABS is transmitted over the ignition
power wire (blue wire of the J560 connector), Pin B of the
5‑pin Standard module connector, or Pin 6 of the 18-pin
Premium module connector.

Bendix® WS-24™ Wheel Speed Sensors
Wheel speed data is provided to the TABS-6 module from
the WS-24™ wheel speed sensors (see Figure 6). Vehicles
have an exciter ring (or “tone ring”) as part of the wheel
assembly, and as the wheel turns, the teeth of the exciter
ring pass the wheel speed sensor, generating an AC signal.
The TABS-6 module receives the AC signal, which varies in
voltage and frequency as the wheel speed changes. (The
default setting expects a 100-tooth tone ring to be used.)
Vehicle axle and ABS control configurations determine if
two or four wheel speed sensors are required. See page
17 for electrical system schematics showing wheel speed
sensor connector pin locations.
A proper sensor installation is critical to correct ABS
operation.
Typically, the WS-24™ sensor is installed in mounting blocks
that are welded to the axle housing. 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 6). The clamping
sleeve provides a friction fit between the mounting block
bore and the WS-24™ sensor.

Sensor
Clamping
Sleeve

90° Speed
Sensors

Logo Stamped
into Sleeve

Straight Speed
Sensors

5. Engage the connectors, and push together until the
lock tab snaps into place.
NOTE: It is important for the wheel bearings to be
adjusted per the manufacturer's recommendations.
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.
Excessive wheel end play can result in diagnostic trouble
codes in cases where the sensor is pushed too far away
from the tone ring.

BENDIX® BR9235™ ABS Modulator
Relay VALVES
Bendix® BR9235™ modulator relay valves (MRV) are
required when additional modulator relay valves are
needed for multichannel brake systems (e.g. 2S/2M, 4S/3M
ABS configurations).
The MRV is an electro-pneumatic control valve and is the
last valve that air passes through on the way to the brake
chambers. The normally-open hold solenoid and normallyclosed exhaust solenoid are activated to precisely modify
the brake pressure on command. During normal braking,
the BR9235™ MRV functions as a standard relay valve. As
brakes are applied or released by the driver, the control
signal from the tractor foot valve causes the BR9235™
MRV to apply proportional pressure to the trailer brake
chambers.
The BR9235™ MRV is available in both tank and bracket
mounting styles.

FIGURE 6 - Bendix® WS-24™ WHEEL SPEED SENSORS

1. For increased corrosion protection we recommend
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 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.
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 connector and harness
connector.

3-Pin Modulator
Solenoid
Connector

3/8" NPT Supply
Port with Integral
Filter

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

FIGURE 7 - Bendix® BR9235™ Modulator relay
valve

Tank (Nipple) Mounted

ABs Flex™ Program

The BR9235™ MRV can be tank-mounted using a schedule
80 (heavy gauge steel) 3/4" NPT nipple directly between
the trailer supply tank and the supply port. A tank with a
reinforced port must be used.

The ABS Flex™ program uses Auxiliary Design Language
(ADL) to allow customized auxiliary functions to be carried
out by the TABS-6 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.

Bracket (Chassis) Mounted
The BR9235™ MRV provides an option with a bracket
for frame mounting directly to the trailer frame rail or
crossmember. It is recommended to use two Grade 5,
3/8‑16 bolts, torqued to 180 – 220 in-lbs.

J1708/J1587 DIAGNOSTIC LINK
The Premium TABS-6 module provides a J1708/J1587
diagnostic link with data and power to communicate with
the vehicle and various diagnostic tools. Diagnostics,
testing, configuration, data transfer and other functions can
be performed using this link. Diagnostic tools such as the
MPSI Pro-Link™ device and Bendix® ACOM™ Diagnostic
Software (version 4.0 and higher) support the TABS-6
Module.
Ignition power must be provided to the TABS-6 module for
the diagnostic link to be active.

AUXILIARY I/O
The Standard module provides for one auxiliary I/O
function.
The Premium module provides for up to five auxiliary
functions and one additional ground. See Chart 3, below.
Bendix® ACOM™ Diagnostic Software (version 4.0 and
higher) supports the configuration of the TABS-6 module
auxiliary I/O’s.
Name

ECU

ECU Pin

For example, ABS Flex ™ program can potentially
communicate 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 J1587 diagnostics and SAE J2497 PLC data links.
Contact your Bendix Account Manager to discuss an ABS
Flex™ program for your vehicle(s).

CUSTOMER SCRATCH PAD
The TABS-6 module has a Customer Scratch Pad feature
which allows the customer, or end-user, to store up to 756
bytes of information. This information can then be read
using the Bendix® ACOM™ Diagnostic Software (version
4.0 and higher).
If additional scratch pad space is needed, this storage
space can be expanded to 1K (1,008 bytes total of data).
Contact Bendix for further details.

POWER-UP SEQUENCE
At power-up, the TABS-6 module performs a series of selfchecks that can assist a technician to determine the ABS
system status and configuration.

Auxiliary Functions

• High-Side Driver… or Digital Input…
AUX
Standard
C

or • Analog Input

None

AUX1
Premium
16
• High-Side Driver… or Digital Input

Modulator 3 (MOD3)
Hold Solenoid

AUX2
Premium
10
• High-Side Driver… or Digital Input

Modulator 3 (MOD3)
Release Solenoid

AUX3
Premium
15
• High-Side Driver… or Digital Input

Modulator 2 (MOD2)
Hold Solenoid

AUX4
Premium
9
• High-Side Driver… or Digital Input

Modulator 2 (MOD2)
Release Solenoid

AUX5
Premium
4
• Low-Side Driver… or Analog Input

Modulator 3 (MOD3)
Common

AUX6
Premium
3
• High-Side Driver… or Digital Input

CHART 3 – Auxiliary I/Os and Default Functions

Default Function

J1587 Diagnostic Power

ABS System
Status Indicators

Power
Application
0.5 1.5 2.0 2.5 3.0 (sec.)

Trailer-mounted ABS ON
Indicator Light OFF
Dash-mounted Trailer ON
ABS Indicator Light (PLC
OFF
Detected)*
Dash-mounted Trailer ON
ABS Indicator Light
(PLC Not Detected) 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 8 - trailer ABS Lamp Start up sequence

Trailer ABS indicator lamp
At power-up without detected faults, the trailer ABS
indicator lamp will turn on for 2.5 seconds as a bulb check
and then turn off. See Figure 8.
If a PLC-ready towing vehicle and trailer are powered at
the same time, the TABS-6 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 module activates a modulator
chuff test. This electrical and pneumatic ABS modulator
test can help the technician identify problems with
modulator installations and/or wiring.
With brake pressure applied, a properly installed modulator
will cause five rapid audible chuffs of air pressure. If
additional modulators are installed, the TABS-6 module
activates 5 chuffs at the internal modulator (MOD1) then
for each additional modulator in sequence (e.g. MOD1,
then MOD2, and then MOD3). The chuff sequence is
then repeated.
If the modulator is wired incorrectly, the modulator will only
produce one chuff, or no chuff at all. If an issue is detected
during the modulator chuff test, compare the modulator
wiring and plumbing to the TABS-6 module’s electrical
system schematic (see page 17) and make repairs.

ABS OPERATION
The TABS-6 module uses wheel speed sensors, modulator
relay valves and an ECU to control trailer wheels by axle
or by side. By monitoring individual wheel turning motion
during braking, and adjusting or pulsing the brake pressure
at each wheel, the TABS-6 module is able to optimize slip
between the tires and the road surface. When excessive
wheel slip, or wheel lock-up, is detected, the ECU will
activate the Pressure Modulator Valves to modulate

braking pressure at the wheel ends. The ECU is able to
pump the brakes on individual wheels (or pairs of wheels),
independently, and with greater speed and accuracy than
a driver.

Axle Control
TABS-6 module axle control uses a single modulator relay
valve to control wheels on both sides of a given axle or
axles. In the case of an ABS event on road surfaces with
poor traction (worn, slippery, or loose gravel roads) or areas
of poor traction, (e.g. asphalt road surfaces with patches of
ice), axle control will maintain the wheel that is not slipping
at just under the speed that will lock the wheel. Temporary
periods of wheel lock are permitted on the other wheel that
is experiencing slippage.
Axle control should not be used on 5th wheel dollies or
steerable axles. When braking on even surfaces, an
axle-control system will perform similar to a side control,
two-modulator system. Axle control is available in 2S/1M,
2S/2M and 4S/2M installations, and for Modulator 3
(MOD3) in a 4S/3M installation.

Dolly-Axle Control (Select Low)
TABS-6 module dolly-axle control uses a single ABS
modulator valve to control wheels from both sides of a
given axle or axles. In the case of an unbalanced braking
surface, (e.g. asphalt road surfaces with patches of ice),
dolly axle control will control the low coefficient (slipping)
wheel just under the lock limit. Vehicle stability is assisted
by not allowing the high coefficient wheel (where traction
is still being maintained) to sustain wheel lock.
When braking on even surfaces, a dolly axle control system
will perform similar to side control or axle control system.
Dolly axle control is only available in 2S/1M installations.

Side Control
The TABS-6 module uses a single modulator relay valve
to control one or more wheels on a given vehicle side. In
the case of an unbalanced braking surface, the side control
will individually control wheels on each side just under the
point where they would lock up.
Side control is available in 2S/2M and 4S/2M installations,
and for the internal modulator (MOD1) and Modulator 2
(MOD2) in the 4S/3M installation.

Normal Braking
During normal braking, the TABS-6 module functions as a
standard relay valve. If the ECU does not detect excessive
wheel slip, it will not activate ABS control, and the vehicle
stops with normal braking.

AUTO-CONFIGURATION

Service Interval

The Standard TABS-6 module is available only in the 2S/1M
ABS configuration and does not use auto-configuration.

The TABS-6 module provides a feature that can be used
to indicate a service interval for the trailer. The service
interval can be accessed via PC or hand-held diagnostic
tools. If configured, the TABS-6 module can flash the
indicator lamp when the vehicle is at standstill to indicate
when the service interval has been exceeded.

For the Premium TABS-6 module, the default ABS
configuration is 2S/1M. At power-up, if a Premium ECU
detects additional sensors and modulators it will perform an
auto-configuration. Auto-configuration only adjusts upward
(e.g. 2S/2M Side to a 4S/2M Side configuration).
Additional detected components that do not conform to a
legitimate configuration will generate the appropriate faults.
If the vehicle begins moving before the new configuration
has been accepted, the reconfiguration will not take place
at this time.

Default

Additional Components

Auto-Configuration

Sensors

Modulators

2S/1M (Dolly-Axle)

2S/1M

to 2S/2M (Side)

Dolly Axle

to 4S/2M (Side)

to 4S/3M (Side/Axle)

2S/1M
Axle

2S/1M (Axle)

to 2S/2M (Axle)

to 4S/2M (Axle)

CHART 4 – PREMIUM TABS-6 module AUTOCONFIGURATION MATRIX

ODOMETER FUNCTION
Odometer
The TABS-6 module includes an odometer function to
provide a means of storing the accumulated mileage of the
vehicle. The mileage is computed by utilizing information
calculated from the vehicle wheel speeds.
This feature is accurate to within 0.62 miles per power-up
and will typically store mileage up to 1,000,000 miles. The
mileage can be displayed using PC diagnostics or through
blink codes.
Whenever the module is towed using a pre-1997 tractor,
the electronic odometer does not function, and the mileage
can be considered out-of-calibration.

Trip Counter
The module provides a counter to record the trip mileage.
The feature is accessed through PC or handheld diagnostic
tools.

NON-STANDARD TIRE SIZE
The module allows for tire rolling radius and tone ring
tooth count parameters to be set for each axle using a
diagnostic tool. These adjustments may be necessary for
the module to accurately calculate the vehicle velocity and
odometer mileage. Wheels of the same axle must be set
to the same rolling radius and tone ring tooth count. In
most cases, these parameters are set by the trailer OEM
and do not need to be adjusted. In the case of a service
replacement unit, always check that these parameters are
set to match the vehicle.
The tire-rolling radius is defaulted to 500 revs/mile and can
be adjusted from 300 to 700 revolutions per mile. Refer to
the manufacturer’s tire specification for correct values.
Tone ring tooth count is defaulted to 100 teeth and can be
set to 60 to 140 teeth.

diagnostic trouble code DETECTION
The TABS-6 module contains self-testing diagnostic
circuitry that monitors the ABS components and wiring.
When the module senses an erroneous system condition,
it activates the external trailer-mounted ABS indicator lamp,
disables all or part of the affected ABS functions, and it
stores the fault code in memory, even when the power is
removed. The module also uses PLC communications to
send the system status to the towing vehicle.
For some trouble codes, the TABS-6 module will
automatically reset (“self-heal”) the active diagnostic
trouble code when the error is corrected (e.g. when a
wheel speed sensor is re-aligned). However, repeated
occurrences of a given trouble code 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, trouble codes can be reset
using blink code diagnostics or with a diagnostic tool.
When a trouble code self-heals or is manually reset, the
code remains stored in the ECU memory. This trouble
code history can be retrieved using blink code diagnostics
or with a diagnostic tool.

Partial ABS Shutdown
Depending on the trouble code detected, the ABS ECU
partly or completely disables the ABS functionality.
The trailer ABS system, for vehicles that only have one
modulator, are disabled by any single fault. In the case of
vehicles with two or three modulators, depending on the
trouble code, the trailer ABS system may still provide some
level of ABS function on axles/wheels that are not affected
by the fault, but the ABS indicator lamp will remain on. In
cases where the ABS is completely disabled, the vehicle
reverts to normal braking (without ABS interventions).
Always repair ABS shutdowns at the earliest opportunity.

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

Voltage Diagnostic Trouble Code
While voltage is out of range, the ABS functionality is
disabled and the system reverts to normal braking. When
the correct voltage level is restored, full ABS is typically
available again. The operating voltage range is 8.0 to
16.0 VDC.

BLINK CODE DIAGNOSTICS
The TABS-6 module provides diagnostic and configuration
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 trouble
codes being generated.
The blink code diagnostics mode is entered by providing
constant power to the ignition circuit and toggling the
brake light power input three times. With a parked towing
vehicle attached, this is done by applying ignition power
and after the power up sequence is complete, depressing
and releasing the brake pedal three or more times, see
below for chart.
Depending on the blink code mode activated, the TABS‑6
module will blink the trailer-mounted ABS indicator
lamp to display: active fault codes; fault code history;
ABS configurations; and odometer mileage. Blink code
diagnostics can also be used to reset active fault codes.
With Ignition Power
Applied, Cycle Brake

Light Power

Blink Code
Action

3 times

Display Active DTCs

4 times

Display Inactive DTCs

5 times

Clear Active DTCs

6 times

Display Configuration

7 times

Display Odometer Mileage

8 times

Reset Configuration

Wait until after the modulator chuff test before activating
the brake light power. 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 blink code diagnostics mode, the
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
To display active codes, apply ignition power and depress
/ release the brake pedal 3 times within 15 seconds.
Following activation, there will be a 5-second delay followed
by a blink code display of all active fault codes. (See pages
10-12 for more information.)

Display Diagnostic Trouble Code History
To display trouble code history, apply ignition power
and depress / release the brake pedal 4 times within 15
seconds. Following activation, there will be a 5-second
delay followed by a blink code display of all history fault
codes. (See pages 10-12 for more information.)

Reset Active Diagnostic Trouble Codes
To reset active codes, apply ignition power and depress
/ release the brake pedal 5 times within 15 seconds.
Following activation, there will be a 5-second delay followed
by a blink code message of:
1-1, (System Fully Operational - No Codes Detected) or a
blink code display of all remaining active fault codes.
The ABS indicator lamp will stay on if active DTCs are still
present.
Resetting active fault codes with blink code diagnostics
does not clear information from trouble code history. Both
blink code diagnostics or diagnostic tools can retrieve
trouble code history, but only diagnostic tools can erase
this information.

CHART 5 – blink code information

Display Configuration
To check the ABS configuration, apply ignition power
and depress / release the brake pedal 6 times within 15
seconds. Following activation, there will be a 5-second
delay followed by a blink code display of the module's
current ABS configuration.
1st Digit
2
4
2nd Digit
1
2
3
3rd Digit
1
2
3
4
5
6

Sensors
2 Sensors
4 Sensors
Modulators
1 Modulator
2 Modulators
3 Modulators
ABS Control Mode
Axle
Side
Dolly-Axle
MOD1 Axle - MOD2 Dolly-Axle
MOD1 Axle - MOD2 Lift Axle
Side (MOD1, MOD2) - MOD3 Dolly-Axle

Display Odometer Mileage
To display the trailer odometer mileage, apply ignition
power and depress / release the brake pedal 7 times within
15 seconds. Following activation, there will be a 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.

Resetting ABS Configuration
To reset the ABS configuration to the default configuration,
apply ignition power and depress / release the brake
pedal 8 times within 15 seconds. Following activation,
the TABS‑6 ABS configuration will reset to the default ABS
configuration (2S/1M).

CHART 6 – ABS configurations

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

No faults

Repair Information

• ABS system fully operational – no faults detected

J1587 J1587
(SID) (FMI)
1

Wheel Speed Sensors (WSS)

2
3
4
5
2
3
4
5
2
3
4
5

1
1
1
1
2
2
2
2
3
3
3
3

SL Sensor signal valid - large air gap
SR Sensor signal valid - large air gap
SAL Sensor signal valid - large air gap
SAR Sensor signal valid - large air gap
SL Sensor signal valid - loss of signal
SR Sensor signal valid - loss of signal
Dynamic Wheel Speed Sensor Fault.
SAL Sensor signal valid - loss of signal
Go to Section G, on Page 29.
SAR Sensor signal valid - loss of signal
SL Sensor signal valid – noisy
SR Sensor signal valid – noisy
SAL Sensor signal valid – noisy
SAR Sensor signal valid – noisy

1
2
3
4
1
2
3
4
1
2
3
4

0
0
0
0
1
1
1
1
2
2
2
2

2
3
4
5

4
4
4
4

SL Sensor shorted or open
SR Sensor shorted or open
Static Wheel Speed Sensor Fault.
SAL Sensor shorted or open
Go to Section G, on Page 29.
SAR Sensor shorted or open

1
2
3
4

4 or 5
4 or 5
4 or 5
4 or 5

2
3
4
5

5
5
5
5

SL Tire diameter out of range
SR Tire diameter out of range
SAL Tire diameter out of range
SAR Tire diameter out of range

• Verify correct tire size as desired.
• Verify proper tire inflation.
• Verify correct number of exciter ring teeth.
• Verify that the ECU has the proper tire size settings.

1
2
3
4

13
13
13
13

• Verify correct ABS configuration using blink codes
or other diagnostic tools.
• If needed, reset to the default ABS configuration and
power-up to initiate auto-configuration.

4
6 SAL Sensor configuration error

6 SAR Sensor configuration error
5

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

Repair Information

J1587 J1587
(SID) (FMI)

Power
6
1 Over-voltage

6
2 Low-voltage

6
3 Excessive power line resistance

• Power supply diagnostic trouble code.
Go to Section F, page 28.
• Power supply diagnostic trouble code.
Go to Section F, page 28.
• Power supply diagnostic trouble code.
Go to Section F, page 28.

251

Modulator (MOD)
7
1 MOD1 Hold solenoid shorted or open
42

• Clear faults.
7
2 MOD1 Release solenoid shorted or
• If faults return, replace the TABS-6 Module.
48
open

3, 4, 5
6 or 12
3, 4, 5
6 or 12

8
1 MOD2 Hold solenoid shorted or open
43

9
1 MOD3 Hold solenoid shorted or open
44

Static ABS Modulator Fault.
8
2 MOD2 Release solenoid shorted or
Go to Section H, on Page 30.
49
open
9
2 MOD3 Release solenoid shorted or
50
open

3, 4, 5
6 or 12
3, 4, 5
6 or 12
3, 4, 5
6 or 12
3, 4, 5
6 or 12

7
8
9

3
3
3

MOD1 ABS modulator dynamic error
Dynamic ABS Modulator Fault.
MOD2 ABS modulator dynamic error
Go to Section H, on Page 30.
MOD3 ABS modulator dynamic error

7
8
9

7
7
7

8
4 MOD2 Valve configuration error

9
4 MOD3 Valve configuration error

• Verify correct ABS configuration using blink codes
or other diagnostic tools.
• If needed, reset to the default ABS configuration
and power-up to initiate auto-configuration.

10
1 Valve MOD1/2 low-side switch shorted
to ground

10
2 Valve MOD3 low-side switch shorted

to ground

• Check for corroded/damaged wiring or connectors
between the ECU and MOD.
At the MOD harness connector, verify:
• No continuity from modulator/AUX leads to ground.
• After repairs or if no issues found, then clear faults.
• If faults return, replace the TABS-6 Module.

10
3

Dynamic ABS Modulator Fault.
Go to Section H, on Page 30.

Dynamic Wheel Speed Sensor Fault.
Go to Section G, on Page 29.

254

Common

ABS modulator dynamic error - all
valves

10
4 Excessive ABS activity

Electronic Control Unit (ECU)
11
1 ECU internal error

11
2 ECU configuration error

• Check for damaged or corroded connectors.
• Check for damaged wiring.
• After repairs or if no issues found, then clear faults.
• If faults return, replace the TABS-6 Module.
• Verify correct ABS configuration using blink codes,
PC-diagnostics or other off-board diagnostic tools.
• If needed, reset to the default ABS configuration and
power-up to initiate auto-configuration.

(Continued over . . .)
11

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

Repair Information

J1587 J1587
(SID) (FMI)

J1587 Diagnostic
12
1 J1587 diagnostics shorted or open

• Check for corroded/damaged wiring or connectors
250 3, 4, 5
between the ECU and J1587 Diagnostic.
or 12
• Verify the following:
- At the 18-pin ECU harness connector:
(a) Continuity of the J1587 Diagnostic wiring to the
lamp (auxiliary device).
(b) +12V is not measured at J1587 Diagnostic lead.
- At J1587 Diagnostic connector:
(a) No continuity of the J1587 Diagnostic lead to
ground.
(b) No continuity from J1587 Diagnostic lead to any
other ECU pin(s).
(c) Replace/repair J1587 Diagnostic wiring or
components as required.

Trailer-Mounted ABS Indicator Lamp
13
1 ABS lamp shorted or open

• Check for corroded/damaged wiring or connectors
81
between the ECU and ABS Indicator Lamp.
• Verify the following:
- At the 5-pin or 18-pin ECU harness connector:
(a) Continuity of the ABS Indicator Lamp wiring
to the lamp (auxiliary device).
(b) +12V is not measured at ABS Indicator Lamp lead.
- At ABS Indicator Lamp connector:
(a) No continuity of the ABS Indicator Lamp lead to
ground.
(b) No continuity from ABS Indicator Lamp lead to any
other ECU pin(s).
(c) Replace/repair ABS Indicator Lamp wiring or
components as required.

3, 4, 5
or 12

Troubleshooting: Using Hand-Held or
PC-Based Diagnostic Tools
Using hand-held or pc-based
diagnostics

LED lights
illuminate
Diagnostic
Trouble Codes
(10 LEDs)

Troubleshooting and diagnostic trouble code 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 ProLink tool.

BENDIX ABS DIAGNOSTIC TOOLS
Bendix® ACom™ Diagnostic Software
Bendix ACom Diagnostic Software (version 4.0 or higher)
is an RP-1210A compliant PC-based diagnostic software
program that provides the highest level of diagnostic
support for the TABS-6 module. With Bendix® ACom™
Diagnostic Software, maintenance personnel can:
®

™

• Obtain fault information (both active and inactive
faults)
• Retrieve event history
• Clear inactive faults and event history
• Verify ECU configuration
• Perform system and component tests
• Read/write customer information on scratch pads
• Save and print information
• Receive troubleshooting assistance
When diagnosing the TABS-6 module using a PC and
Bendix® ACom™ Diagnostic Software, the computer’s serial
or parallel port can be connected to the vehicle’s diagnostic
connector through a RP-1210A compliant communications
device.
For more information on the Bendix® ACom™ Diagnostic
Software, or RP-1210A compliant tools, contact Bendix or
refer to your local authorized Bendix parts outlet.

Figure 15 - The Bendix® Trailer Remote
Diagnostic Unit

Bendix® TRDU™ (Trailer Remote Diagnostic Unit)
Tool
The Bendix® TRDU™ tool provides the technician with
a visual indication of Antilock Braking System (ABS)
component Diagnostic Trouble Code (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 17) and then into the J560 of the towing vehicle.
The TRDU™ tool communicates across PLC.
The TRDU™ tool allows the technician to:
• Troubleshoot ABS system component problems using
Diagnostic Trouble Code reporting via LEDs.
• Reset Diagnostic Trouble Codes on Bendix® ABS ECUs
by holding a magnet over the reset of the TRDU™ tool
for less than 6 seconds.
• Initiate a self-configuration event Mode used by Bendix®
ABS ECUs by holding a magnet over the reset area for
greater than 6 seconds but less than 11 seconds.
LED Diagnostic Trouble Codes

Lap Top Computer

Parallel or Serial
Cable

J1708/J1587
or J1939

PDM (RP-1210A)

FIGURE 14 - Bendix ABS Diagnostic Software

VLT -
ECU -
SEN -

MOD1 -
MOD2 -

Power
ABS Controller
Wheel Speed
Sensor
Modulator 1
Modulator 2

MOD3 -
LFT -
RHT -
ADD -
ODO -

Modulator 3
Left
Right
Additional
Odometer

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

LEDs
Green
VLT
Blue
ODO
All
others
are
Red

FIGURE 16 - DIAGNOSTIC trouble COdes
13

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. Activation
requires a magnet with 30 gauss minimum.

TRDU™ Tool

to Trailer
Connector

to Towing
Vehicle
J560
Connector

Adapter
FIGURE 17 - TRDU™ tool and adapter

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, 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,
only the green LED will remain illuminated.
If the ABS ECU has at least one active Diagnostic
Trouble Code the TRDU™ tool displays the first diagnostic
trouble code by illuminating the red LEDs, indicating the
malfunctioning ABS component and its location on the
vehicle. (See Figure 18.) If there are multiple diagnostic
trouble codes on the ABS system, the TRDU™ tool will
display one diagnostic trouble code first, then once that
Diagnostic Trouble Code 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 page 10 for more
details.
• VLT (Flashing indicates either over- or under-voltage
condition)
To pinpoint the root cause and to ensure the system
diagnostic trouble code is properly corrected the first time,
additional troubleshooting may be necessary.

The reset operations are:
1. If the magnet is held over the switch for less than 6
seconds the "clear diagnostic trouble codes" command
is sent.
2. If the magnet is held over the switch for more than 6
seconds, but less than 11 seconds, the Bendix® ABS
"self-configuration command" is sent.
Additionally, it is recommended at the end of any inspection
that the user switches off and restores the power to the
ABS ECU, then check the ABS Indicator Lamp operation
and TRDU™ tool to see if they indicate any remaining
Diagnostic Trouble Codes.

MPSI Bendix Cartridge
MPSI provides a Bendix cartridge for use with the ProLink™ tool. For more information on the Bendix diagnostic
cartridge from MPSI, contact Bendix or refer to your local
authorized Bendix parts outlet.

PLC Diagnostic Tool
Diagnostic tools are available that detect the presence
of a PLC signal and perform further system diagnostics
directly on the power line. For more information on these
diagnostic tools, contact Bendix or refer to your local
authorized Bendix parts outlet.

Pro-Link

Heavy Duty
Multi Protocol
Cartridge

PC Card MPSI
Part Number
805013

FIGURE 19 - nExIQ (MPSI) pro-link tool

CONTACTING BENDIX
www.Bendix.com
The Bendix on-line troubleshooting guide will help you
determine the cause performance issues with your braking
system.

FIGURE 18 - TRDU™tool LED Locations
14

The Bendix on-line contacts directory will make it easy
for you to find the Bendix contacts you need. From this
page, you can navigate to technical support contacts,

service engineers, Bendix account managers, international
contacts and more. Bendix.com is your complete Bendix
resource.

REMOVING THE TABS-6 module

Bendix Technical Assistance Team

2. Disconnect the 5 or 18-pin ECU connector and the two
2-pin wheel speed sensor connectors.

For direct personal technical support, call the Bendix
technical assistance team at:
1-800-AIR-BRAKE (1-800-247-2725),
Monday through Friday, 8:00 A.M. to 6:00 P.M. EST, and
follow the instructions in the recorded message.
Alternatively, you may e-mail the Bendix technical
assistance team at: tbs.techteam@bendix.com.

To better serve you, please record the following
information before you call the Bendix Tech Team,
or include this information in your e-mail:
• Bendix product model number, part number and
configuration.
• Vehicle make and model.
• Vehicle configuration. (Number of axles, tire size,
etc.)
• System performance symptoms: When do they
occur?
• What faults 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 TABS-6 Module
CAUTION: All TABS-6 modules are initially
defaulted to 2S/1M and may auto-configure to
another ABS configuration if additional sensors
and/or ABS modulators are detected. An incorrect
ABS configuration may cause fault indication or
degraded ABS performance. Before and after
activating a self-configuration, always check the
current ABS configuration by using blink code
diagnostics or a diagnostic tool.
Prior to performing service to the TABS-6 module, always
perform the following steps:
1. Follow all Safe Maintenance Practices including, but
not limited to, those on page 2 of this document.
2. Turn power off.
3. Drain the air pressure from all reservoirs.
4. Remove as much contamination as possible prior to
disconnecting electrical connections and air hoses.
5. Note the TABS-6 module's mounting position on the
vehicle.

1. Open the cover by sliding the locking tab to the left.
Retain the cover.

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

SERVICE REPLACEMENT OF OTHER ABS
CONTROLLERS
The TABS-6 module is designed to be used as the
service replacement part for the Bendix ® MC-12 ™ ,
MC‑30 ™ and A‑18 ™ trailer ABS controllers. When
controller service replacement parts are required, a
TABS-6 module and pigtail harness must replace the entire
MC‑12™, MC‑30™ or A‑18™ controller assembly and pigtail
harness. When replacing an MCE‑12™ controller, the
integral emergency function (EV‑2™ valve) must be replaced
by a DC-4™ and TR-3™ valve combination. See pages 1821 for plumbing details. TABS-6 module kits are available
to replace all MC-12 ™, MC‑30™ and A‑18™ controller
assemblies and harnesses. For more information, contact
Bendix or your local authorized Bendix parts outlet.
1. Disconnect the power connector and wheel speed
sensors from the MC-12™ or MC-30™ controller pigtail
harness.
2. Remove all air hoses and plugs connected to the
unit.
3. Remove the MC-12™ or MC-30™ controller assembly
and pigtail from the vehicle by removing the mounting
bracket nuts or by rotating the entire assembly counter
clockwise from the tank nipple mount.
4. Install the new pigtail, starting at the power connector
and properly securing the harness every 18 inches to
the ECU location.
5. Next, refer to the Reinstallation of the TABS-6 Module
section.

REINSTALLATION OF THE TABS-6 module
CAUTION! All TABS-6 module service replacement
parts are initially defaulted to 2S/1M and may autoconfigure to another ABS configuration if additional
sensors and/or ABS modulators are detected. An
incorrect ABS configuration may cause fault indication
or degraded ABS performance. Before and after
activating a self-configuration, always determine the
current ABS configuration by activating blink code
diagnostics.
Inspect the original mounting hardware: If it is in good
condition, it can be reused for installation. If replacement
15

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
replacement trailer ABS 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. Position and secure the unit in the original mounting
orientation (the exhaust port must point straight
down):

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.

2. Reconnect all air hoses and plugs to the module.
Depending on the installation, additional plugs may be
necessary. Make certain that no thread sealing material
enters the valve. All air hoses and fittings should be
checked for leaks prior to returning the vehicle to
service.
3. Reconnect the ECU and wheel speed sensor electrical
connectors to the unit. Apply a moderate amount of
non-conductive electrical grease to each connector pin
before reconnecting.
4. The new TABS-6 module may need to be reconfigured
for proper operation. See page 8.
5. Leakage and Operational Tests must be performed
before returning the vehicle to service.

LEAKAGE AND OPERATIONAL TESTS

1. Before performing leak tests, block the wheels.
2. Fully charge air brake system and verify proper brake
adjustment.
3. Make several trailer brake applications and check for
prompt application and release at each wheel.
4. Check the module, modulator valve(s) and all air hose
fittings for leakage using a soap solution:

Check the ABS solenoid body with the trailer service
brakes fully applied. If leakage is excessive, more
than a single 1" bubble within 1 minute, replace the
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 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
module.
5. Apply power and monitor the power-up sequence to
verify proper system operation. See page 6.
6. Determine the current ABS configuration by activating
blink code diagnostics or using a diagnostic tool. If
necessary, reset the ABS configuration and allow the
module to auto-configure. See page 8.
7. Calibrate and set odometer parameters if necessary
using a diagnostic tool. Refer to the Odometer Function
section on page 8.
8. Where a safe location (e.g. restricted access area
or test track) is available, it is possible to road test
the ABS function by making an abrupt stop from a
vehicle speed of about 20 MPH to check for proper
function. The wheels should not enter a prolonged lock
condition and ABS function should be audible. It is the
responsibility of the technician to perform this test in a
safe location.

ABS WIRING
All connector leads of the TABS-6 module pigtail harness
are weather sealed at the connector interface and are
clearly labeled for proper installation.
Bendix provides over-molded versions of the TABS-6
wiring harness and Bendix recommends that the complete
harness be replaced if corrosion or damage occurs.
When troubleshooting ABS wiring, some general rules
should be followed where applicable.
1. Check all wiring and connectors to ensure they are
secure and free from visible damage (e.g. cuts,
abrasions, etc.).
2. Check for evidence of wire chafing due to poor routing,
or poor securing, of wires.
3. Check connectors for proper insertion and locking.
4. Verify that the connector pins are properly greased with
a non-conductive electrical grease compound.
5. Connector terminals must not show signs of corrosion
or exposure to the environment.
6. Never pierce wire insulation when checking for
continuity.
7. Do not deform individual pins or sockets during probing
with a volt/ohm meter.
8. It is strongly recommended to properly secure all wiring
harness and sensor leads at least every 18 inches.
9. Apply a moderate amount of non-conductive electrical
grease to each connector pin before reconnecting.

Troubleshooting: Electrical Schematics

Figure 20 - Standard tabs-6 module (5-pin ecu connector) electrical schematic - 2S/1M

7-WAY SAE J560
CONNECTOR
1

SENSOR
RIGHT SR

SENSOR RIGHT SR (+)

SENSOR RIGHT SR (-)

GROUND

IGNITION VOLTAGE
BRAKE LAMP VOLTAGE
ABS WARNING LAMP (AUX7)

TRAILER-MOUNTED
ABS WARNING LAMP

SENSOR ADD.
RIGHT SAR

SENSOR ADD. RIGHT SAR (+)

SENSOR ADD. RIGHT SAR (-)

MODULATOR VALVE
MOD2

SENSOR ADD.
LEFT SAL

1
2

MOD1/2 COMMON

MOD2 HOLD

MODULATOR VALVE
MOD3
6-WAY SAE J1587
CONNECTOR

MOD2 RELEASE

1
2
3

18
6
12
5
11
17
9
3
15
10

MOD3 COMMON

MOD3 HOLD
SENSOR ADD. LEFT SAL (+)
SENSOR ADD. LEFT SAL (-)

J1587 (A)

MOD3 RELEASE

J1587 (B)

16
8

PREMIUM
TABS-6
Trailer
ABS
Controller

14
7
1

J1587 GROUND 13

J1587 VOLTAGE (AUX6)

SENSOR
LEFT SL

1
2

SENSOR LEFT SL (+)
SENSOR LEFT SL (-)

1
2

Figure 21 - Premium tabs-6 module (18-pin ecu connector) electrical schematic - 4s/3M

Troubleshooting: System Schematics
2S/1M - AXLE
CONTROL

Light Power
B Ignition
Power
C NC

Bendix® WS-24™
Wheel Speed
Sensor "SR"

Right “Curb-Side”

A Brake
D
A

C
B

D Warning
Lamp

Trailer
Chassis
Harness

7-PIN
CONNECTOR

Ground

E Ground

5-PIN
CONNECTOR

Trailer ABS
Pigtail
Harness

Bendix®
SR-5™ Trailer
Spring Brake
Valve

SUPPLY
LINE

Ignition
Power

TABS

CONTROL
LINE

Bendix®
TABS-6
Trailer
ABS
Module

Brake
Light
Power

Dual Axle Trailer
ABS

ABS
Indicator Lamp

Left “Road-Side”

Bendix® WS-24™
Wheel Speed
Sensor "SL"

Troubleshooting: System Schematics (continued)
WS Sensor
"SR"

2S/2M - AXLE CONTROL
A
B
C
D
E

Brake Light Power
Ignition Power
NC
Warning Lamp
Ground

Right - “Curb-Side”
D
A

C
B

CONTROL
LINE

Ground

5-PIN
CONNECTOR

Trailer ABS
Pigtail Harness
“MOD2”
Bendix®
BR9235™
Modulator
Relay
Valve

SR-5™ Trailer
Spring Brake
Valve

SUPPLY
LINE

Ignition
Power

TABS

Trailer
Chassis Harness

7-PIN
CONNECTOR

“MOD1”
TABS-6
Trailer
ABS
Module

Brake Light
Power

Dual Axle Trailer

ABS Light

ABS

Left - “Road-Side”
WS Sensor
"SL"

Installation Guidelines for the TABS-6 2S/2M Axle ABS Configuration:

o
o
o
o

MOD1 (TABS-6 ABS Unit) controls the left “road-side” wheel(s) of a primary axle(s).
MOD2 (Bendix® BR9235™ Modulator Unit) controls the wheels of an additional axle(s).
SL & SR (Primary Sensors) senses wheels on the primary axle (always on ground) that MOD1 controls.
For lift axle applications, MOD2 controls the wheels for the lift-able axle
WS Sensor
"SR"

2S/2M - SIDE CONTROL
A
B
C
D
E

Brake Light Power
Ignition Power
NC
Warning Lamp
Ground

Right - “Curb-Side”
D
A

C
B

CONTROL
LINE

Ground

5-PIN
CONNECTOR

Trailer ABS
Pigtail Harness

SR-5™ Trailer
Spring Brake
Valve

SUPPLY
LINE

Ignition
Power

TABS

Trailer
Chassis Harness

7-PIN
CONNECTOR

Bendix®
BR9235™
Modulator
Relay Valve
“MOD2”

“MOD1”
TABS-6
Trailer
ABS Module

Brake Light
Power

Dual Axle Trailer
ABS

ABS Light

Left - “Road-Side”

WS Sensor
"SL"

Installation Guidelines for the TABS-6 2S/2M Side ABS Configuration:
o MOD1 (TABS-6 ABS Unit) controls the left “road-side” wheel(s) of a primary axle(s).
o MOD2 (Bendix® BR9235™ Modulator Unit) controls the right “curb-side” wheel(s) of a primary axle(s).
o For lift axle applications, SL & SR (Primary Sensors) senses the wheels of the stationary, non lift-able axle
19

Troubleshooting: System Schematics (continued)
WS Sensor
"SAR"

4S/2M - AXLE CONTROL

A
B
C
D
E

Brake Light Power
Ignition Power
NC
Warning Lamp
Ground

D
A

C
B

Right “Curb-Side”

WS Sensor
"SR"

CONTROL
LINE

Trailer
Chassis Harness

Ground

5-PIN
CONNECTOR

“MOD2”
Bendix®
BR9235™
Modulator
Relay Valve

SR-5™ Trailer
Spring Brake
Valve

SUPPLY
LINE

Ignition
Power

Trailer ABS
Pigtail Harness

TABS

7-PIN
CONNECTOR

“MOD1”
TABS-6
Trailer
ABS
Module

Brake Light
Power

ABS Light

Full Trailer
ABS

Left “Road-Side”

WS Sensor
"SAL"

WS Sensor
"SL"

Installation Guidelines for the TABS-6 4S/2M Axle ABS Configuration:
o MOD1 (TABS-6 ABS Unit) controls the left “road-side” wheel(s) of a primary axle(s).
o MOD2 (Bendix® BR9235™ Modulator Unit) controls the wheels of an additional axle(s).
o SL & SR (Primary Sensors) senses wheels on the primary axle (always on the ground) that MOD1 controls, and
are connected to the dedicated 2-pin connector on the TABS-6 ECU.
o SAL & SAR (Additional Sensors) senses the wheels that MOD2 controls, and are connected to the 18-pin
connector on the TABS-6 ECU.
o For lift axle applications, MOD2 controls the wheels for the lift-able axle
WS Sensor
"SAR"

4S/2M - SIDE CONTROL
A
B
C
D
E

Brake Light Power
Ignition Power
NC
Warning Lamp
Ground

WS Sensor
"SR"

Right - “Curb-Side”
D
A

C
B

CONTROL
LINE

Trailer
Chassis Harness

7-PIN
CONNECTOR

Trailer ABS
Pigtail Harness

“MOD2”

SR-5™ Trailer
Spring Brake
Valve

SUPPLY
LINE

Ignition
Power

TABS

Ground

5-PIN
CONNECTOR

Bendix®
BR9235™
Modulator
Relay Valve

“MOD1”
TABS-6
Trailer
ABS Module

Brake Light
Power

Dual Axle Trailer
ABS

ABS Light

Left - “Road-Side”

WS Sensor
"SAL"

WS Sensor
"SL"

Installation Guidelines for the TABS-6 4S/2M Side ABS Configuration:
o MOD1 (TABS-6 ABS Unit) controls the left “road-side” wheel(s) of a primary axle(s).
o MOD2 (Bendix® BR9235™ Modulator Unit) controls the right “curb-side” wheel(s) of a primary axle(s).
o SL & SR (Primary Sensors) are connected to the dedicated 2-pin connector on the TABS-6 ECU.
o SAL & SAR (Additional Sensors) are connected to the 18-pin connector on the TABS-6 ECU.
o For lift axle applications, SAL & SAR (Additional Sensors) senses the wheels of the lift-able axle
20

Troubleshooting: System Schematics (continued)
4S/3M - SIDE/AXLE CONTROL
Brake Light Power
Ignition Power
NC
Warning Lamp
Ground

D
A

C
B

Right “Curb-Side”

CONTROL
LINE

Trailer
Chassis Harness

7-PIN
CONNECTOR

Ground

WS Sensor
"SR"

5-PIN
CONNECTOR

Trailer ABS
Pigtail Harness

Bendix®
BR9235™ Modulator
Relay Valve
“MOD3”

SUPPLY
LINE

SR-5™ Trailer
Spring Brake
Valve

Ignition
Power

Bendix®
BR9235™
Modulator
Relay Valve
“MOD2”

TABS

A
B
C
D
E

WS Sensor
"SAR"

“MOD1"

TABS-6
Trailer
ABS Module

Brake Light
Power

Tri-Axle Trailer
ABS

ABS Light

Left “Road-Side”

WS Sensor
"SAL"

WS Sensor
"SL"

Installation Guidelines for the TABS-6 4S/3M Side/Axle ABS Configuration:
o MOD1 (TABS-6 ABS Unit) controls the left “road-side” wheel(s) of a primary axle(s).
o MOD2 (Bendix® BR9235™ Modulator Unit) controls the right “curb-side” wheel(s) of a primary axle(s).
o MOD3 (Bendix® BR9235™ Modulator Unit) controls the wheels of an additional axle(s).
o SL & SR (Primary Sensors) senses wheels on the primary axle (always on the ground) that MOD1 controls, and
are connected to the dedicated 2-pin connector on the TABS-6 ECU.
o SAL & SAR (Additional Sensors) senses the wheels that MOD3 controls, and are connected to the 18-pin
connector on the TABS-6 ECU.
o For lift axle applications, MOD3 controls the wheels for the lift-able axle

Troubleshooting Flowcharts
Diagnostic trouble code information can be retrieved from
the TABS-6 module by using blink code diagnostics, or a
diagnostic tool. The following troubleshooting flow charts
will help the technician isolate the cause of the fault and
confirm whether the fault resides in the component, wiring
or connectors.
Troubleshooting should always begin by observing the
dash or trailer-mounted ABS indicator lamp during the
TABS-6 module's power-up sequence. If it is necessary

to make electrical measurements, always begin by taking
voltage and resistance measurements at the 5 or 18-pin
ECU pigtail harness connector.
Once the circuit fault is found, isolate the area needing
repair by repeating the measurements at all connections
in the affected circuit towards the modulator, wheel speed
sensor, etc.
No voltage or resistance measurements are to be made on
the bulkhead connector pins of the module.

Troubleshooting Flowcharts

Section A : (Power-Up Sequence)

Trailer-Mounted ABS Indicator Lamp . . . . . . . Page 23
Section B: (Power-Up Sequence)

Dash-Mounted ABS Indicator Lamp . . . . . . . . Page 24
Section C: Diagnostic Trouble Code (DTC) Blink

Code Quick Reference . . . . . . . . . . . . . . . . . . . Page 25
Section D: Diagnostic Trouble Code

TRDU™ Tool LED Quick Reference . . . . . . . . . . Page 26
Section E: Troubleshooting the Trailer-Mounted

ABS Indicator Lamp Circuitry . . . . . . . . . . . . . Page 27
Section F: Troubleshooting the Power Supply . . . . . . . . . Page 28
Section G: Troubleshooting the WS-24™ Wheel

Speed Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . Page 29
Section H: Troubleshooting the BR9235™ Modulator

Relay Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 30

Section A: (Power-Up Sequence)
Trailer-Mounted ABS Indicator Lamp

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

Section C: Diagnostic trouble code (DTC)
blink code Quick reference

1st Blink Code

Code Location

2nd Blink Code
Code Description

1
All
1
No Diagnostic Trouble Codes

2
Sensor SL
1
Sensor signal valid - large air gap

3
Sensor SR
2
Sensor signal valid - loss of signal

4
Sensor SAL
3
Sensor signal valid - noisy

5
Sensor SAR
4
Sensor shorted or open

5
Tire diameter out of range

6
Sensor configuration error

6
Power
1
Over-voltage

2
Low-voltage

3
Excessive power line resistance

7
Valve MOD1
1
Hold solenoid (AUX) shorted or open
2
Release solenoid (AUX) shorted or open

8
Valve MOD2
3
ABS modulator dynamic error

9
Valve MOD3

4
Valve configuration error

10
Common
1
Valve MOD1/2 low-side switch shorted to ground

2
Valve MOD3 (AUX) low-side switch shorted to ground

3
ABS modulator dynamic error - all valves

4
Excessive ABS activity
11
ECU
1
ECU internal error

2
ECU configuration error

12
Diagnostics
1
J1587 diagnostics (AUX6) shorted or open

13
Indicator Lamp
1
ABS lamp (AUX7) shorted or open

Repair Information
• System fully operational - no faults detected
• Go to Section G - Dynamic WSS DTCs
• Go to Section G - Dynamic WSS DTCs
• Go to Section G - Dynamic WSS DTCs
• Go to Section G - Static WSS DTCs
• Verify correct tire size, proper tire inflation & correct
number of exciter ring teeth. Verify that the ECU
has the proper tire size settings.
• Verify correct ABS configuration. If needed, reset to
the default ABS configuration and power-up to
initiate auto-configuration.
• Go to Section F - Power Supply
• Go to Section F - Power Supply
• Go to Section F - Power Supply
• Go to Section H - ABS Modulator DTCs
• Go to Section H - ABS Modulator DTCs
• Go to Section H - ABS Modulator DTCs
• Verify correct ABS configuration. If needed, reset to
the default ABS configuration and power-up to
initiate auto-configuration.
• Go to Section H - ABS Modulator DTCs
• Go to Section H - ABS Modulator DTCs
• Go to Section H - ABS Modulator DTCs
• Go to Section G - Dynamic WSS DTCs
• Check for damaged or corroded connectors. Check
for damaged wiring. After repairs or if no issues
found, then clear faults. If faults return, replace the
module.
• Verify correct ABS configuration. If needed, reset to
the default ABS configuration and power-up to
initiate auto-configuration.
• Check for corroded/damaged wiring or connectors
between the ECU and J1587 Diagnostic (AUX6).
Replace/repair J1587 Diagnostic (AUX6) wiring or
components as required.
• Go to Section E - Trailer ABS Indicator Lamp

To Read/Clear Diagnostic Troubleshooting Codes (DTCs):
1. Apply constant power to the trailer (ignition switch).
2. Within 15 seconds, apply/release the brake pedal at 1 second intervals:

(a) 3 times for displaying Active DTCs.

(b) 4 times for displaying Inactive DTCs.

3. After 5 seconds delay, the blink codes will be displayed.
4. Observe the trailer-mounted ABS indicator lamp and record blink code(s).
5. Refer to blink code chart for description.
6. After making repairs and clearing Active DTCs, verify lamp is no longer illuminated.
25

SECTION D: DIAGNOSTIC TROUBLE CODE (DTC)
TRDU™ tool LED QUICK REFERENCE

Power
System OK - A solid green VLT LED indicates proper
voltage is reaching the module. If no red LEDs are on,
then no DTC's are detected.
If the ABS indicator lamp is on with no red LEDs, Go To
Section E, page 27.
Voltage Out of Range - A flashing green VLT LED
indicates ECU voltage below 8.0 VDC or above 16.0
VDC. The VLT LED will flash until power is brought into
normal range. Go to Section F, page 28.
No Voltage - When the VLT LED is off, the module is
receiving very low or no voltage, or there is no
communication to TRDU. The ECU LED may be on in
this case. Go to Section F, page 28.

ABS Modulator DTC
The red M1, M2 and/or M3 LED is on to indicate a DTC
with an ABS modulator. The example above shows the
LEDs illuminated when there is a DTC for a second ABS
modulator (MOD2).
The indicated modulator DTC may be static or dynamic.
Static DTCs are related to wiring or component failures
such as open or short circuits.
Dynamic modulator DTCs are related to abnormal
wheel speed behaviors during ABS.
Go to Section H, page 30.

O M1
OD

Magnetic Reset - All LEDs will be on
while a magnet is held in place at the
RESET location near the “B” in Bendix.
When held for less than 6 seconds, the
DTCs are cleared. When held for more
than 6 seconds,the ABS configuration is
reset. If one or more LEDs do not illuminate,
replace the TRDU™ tool. Do not reset the
DTC codes until troubleshooting of the
indicated component is complete.

Wheel Speed Sensor DTC
The red SEN LED is on to indicate a DTC with a wheel
speed sensor. The example above shows the LEDs
illuminated when there is an additional right sensor
(SAR) DTC.
Troubleshooting and repair are the same for a DTC on
any wheel speed sensor. The indicated sensor DTC
may be static or dynamic.
Static DTCs are related to wiring or component failures
such as open or short circuits.
Dynamic DTCs are related to abnormal wheel speed
signals or behaviors.
Go To Section G, page 29.

ECU DTC
The red ECU LED is on to indicate a DTC internal to the
TABS-6 module. Reset the TRDU™ tool with a magnet. If
the DTC returns, replace the module.
If the red ECU LED is on and the green VLT LED is off,
the module may have very low voltage. In this case, go
to Section F.

Odometer Mileage - The TRDU will
continously display the odometer
information (x1000) by flashing the
blue ODO LED. There will be a 20
second pause between ODO displays.
As an example: 152,431 miles will be
displayed as:
152 (x1000) ... or 1 blink (pause), 5
blinks (pause), 2 blinks.
Zeros are displayed by the blue ODO
LED strobing twice.

SECTION E: TROUBLESHOOTING THE TRAILER-MOUNTED
ABS INDICATOR LAMP CIRCUITRY

Looking into
Standard TABS6 Module Wire
Harness (Pin D ABS
Indicator Lamp)

Looking into Premium
TABS-6 Module Wire
Harness (Pin 5 ABS
Indicator Lamp)
27

SECTION F: TROUBLESHOOTING THE
POWER SUPPLY

Measure the loaded
voltage across a type
1157 brake light bulb.

Looking into Premium TABS-6 Module Wire Harness,
ECU Connector Measure:
Pin 6 (Ignition Power) to Pin 18 (ground) and
Pin 12 (Brake Light Power) to Pin 18 (ground)
28

Looking into Standard TABS-6 Module Wire Harness,
ECU Connector Measure:
Pin B (Ignition Power) to Pin E (ground) and
Pin A (Brake Light Power) to Pin E (ground)

SECTION G: TROUBLESHOOTING THE
WS-24™ WHEEL SPEED SENSORS (WSS)

Looking into Wire Harness(es)
SR Sensor
1 - Right (Curb) Sensor +
2 - Left (Curb) Sensor -

SL Sensor
1 - Left (Road) Sensor +
2 - Right (Road) Sensor -

Looking into Premium TABS-6 Module Wire Harness
when Additional Wheel Speed Sensors are used:
SAR: 11 - Additional Right (Curb) Sensor +
17 - Additional Right (Curb) Sensor -

SAL: 8 - Additional Left (Road) Sensor +
14 - Additional Left (Road) Sensor 29

SECTION H: TROUBLESHOOTING THE
MODULATOR RELAY VALVES

Premium TABS‑6 Module Wire Harness for BR9235™
Modulator Valve Connector

Looking into Modulator
Connector Pins:
Pin 1 (Release)
Pin 2 (Common)
Pin 3 (Hold)
30

(Optional)

Looking into ECU
Connector:

Pin 9 is MOD2 release
Pin 3 is MOD2 Common
Pin 15 is MOD2 Hold

Pin 10 is MOD3 release
Pin 4 is MOD3 Common
Pin 16 is MOD3 Hold

Bendix Part Number

Date of Manufacture Code

5-Pin ECU Pin-Out

2-Pin Sensor Pin-Out
and Routing Info

Number Showing
the Initial Software
Loaded
(Software may be revised
on the production line or
in the field.)
Bendix Part Number

Bendix Part Number

2-Pin Sensor Pin-Out
and Routing Info

18-Pin ECU Pin-Out

Figure 22 - Label information

ECU Part Number Label
The external part number label is located on the relay valve portion of
the module. Label shown above is located under the removable cover
of the TABS-6 module. If the part number label is not readable or is
painted over, the ECU part number and revision can be read using a
diagnostic tool. The number of the initial software loaded on the ECU
is also indicated.
The module part number, and pin-out information is shown on the label
beneath the removable cover.
Software Revision Level
The current software revision number can be read using a diagnostic
tool.
Document Revision Level
Please visit Bendix.com to ensure you have the latest version of this
document.

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