NHTSA ID Number: 11027967
Manufacturer Communication Number: SD-13-47572A
TSB/Document Date: 2026-02-02
Summary
Bendix® TABS‑6™ Advanced Multi-Channel (MC) (ABS/TRSP) and MC LITE (ABS Only) Trailer Antilock Braking System (ABS) Modules The Bendix® TABS‑6™ Advanced (ADV) Multi-Channel (MC) module (Generation 2) is an integrated, MC (4S/2M) trailer service brake module controller for air-braked, heavy-duty semi trailers that features the Bendix® Antilock Brake System (ABS) and Bendix® Trailer Roll Stability Program (TRSP®). TABS-6 ADV MC offers a LITE version, which provides an ABS-only functionality while keeping the benefits of having a multi-channel system. NOTE: All references to the TABS-6 module in this document – aside from TRSP-related references – also include the MC LITE module. Installed on semi-trailers, the module acts as a relay valve during service braking, but during ABS events, it may intervene to help maintain vehicle stability by modulating brake pressure at the wheel ends. The Bendix TRSP monitors the trailer's motion and reduces the risk of rollovers by automatically applying the brakes when a risk of a rollover is detected. NOTE: The Bendix TRSP is not available for TABS-6 MC LITE.
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TSB/Document ID: SD-13-47572A
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-31
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES
MFR Component System: Trailer
MFR Component Subsystem: ABS
Previous TSB | Next TSB |
Control Line
Bendix®
TABS‑6™
Advanced
Multi-Channel
(MC) Module
Supply Line
Bendix® SR-5™
Trailer Spring
Brake Valve
P21
Load Sensor
(Optional)
ABS Indicator Lamp
“S-D”
Semi-Trailer Tandem Axle Trailer
“S-F”
Bendix® WS-24™ Wheel Speed Sensors
Figure 30 – TABS‑6 ADV MC/MC LITE - 4S/2M Side Control (180°) with Rear Lift Axle, ABS Electrical and Air System
29
TROUBLESHOOTING: SYSTEM SCHEMATICS
4S/2M - AXLE CONTROL - Front Lift Axle
180° Mounting Orientation
Ground
Ignition
Power
A
B
Brake Lamp Power
Ignition Power
C
NC
D
E
Indicator Lamp
Ground
7-Pin SAE J560
Connector
Right - “Curb-Side”
Bendix® WS24™ Wheel
Speed Sensors
“S-C”
“S-E”
Load Sensor
(Optional)
5-Pin ABS
Connector
Brake Lamp Power
Dashed-line
Box
Shows Lift
Axle
Air Bellow
(where used)
P22
Trailer Chassis Harness
Control Line
Supply Line
Bendix®
TABS‑6™
Advanced MultiChannel (MC)
Module
Bendix® SR-5™
Trailer Spring
Brake Valve
P21
ABS Indicator Lamp
Semi-Trailer Spread Axle Trailer
“S-F”
“S-D”
Bendix® WS-24™
Wheel Speed
Sensors
Left - “Road-Side”
Figure 31 – TABS‑6 ADV MC/MC LITE - 4S/2M Axle Control (180°) with Front Lift Axle, ABS Electrical and Air System
Right - “Curb-Side”
4S/2M - AXLE CONTROL - Rear Lift Axle
180° Mounting Orientation
Ground
Ignition
Power
A
B
Brake Lamp Power
Ignition Power
C
D
NC
Indicator Lamp
E
Ground
Load Sensor
(Optional)
Trailer Chassis Harness
Bendix® WS24™ Wheel
Speed
Sensors
“S-C”
5-Pin ABS
Connector
Brake Lamp Power
7-Pin SAE J560
Connector
Dashed-line Box
Shows Lift Axle
“S-E”
Air Bellow
(where used)
P22
Control Line
Bendix®
TABS‑6™
Advanced
Multi-Channel
(MC) Module
Supply Line
Bendix® SR-5™
Trailer Spring
Brake Valve
P21
ABS Indicator Lamp
Semi-Trailer Spread Axle Trailer
Bendix®
WS-24™
Wheel
Speed
Sensors
“S-D”
“S-F”
Left - “Road-Side”
Figure 32 – TABS‑6 ADV MC/MC LITE - 4S/2M Axle Control (180°) with Rear Lift Axle, ABS Electrical and Air System
30
TROUBLESHOOTING: SYSTEM SCHEMATICS
Dashed-line Box
Shows Lift Axle
4S/2M - AXLE CONTROL - Front Lift Axle
0° Mounting Orientation
Ground
Ignition
Power
A
B
Brake Lamp Power
Ignition Power
C
D
NC
Indicator Lamp
E
Ground
Bendix® WS-24™
Wheel Speed
Sensors
Air Bellow
(where used)
“S-F”
Load Sensor
(Optional)
“S-D”
5-Pin ABS
Connector
Brake Lamp Power
7-Pin SAE J560
Connector
Right - “Curb-Side”
Trailer Chassis Harness
P21
Bendix®
TABS‑6™
Advanced
MultiChannel
(MC)
Module
P22
Control Line
Supply Line
Bendix® SR-5™
Trailer Spring
Brake Valve
ABS Indicator Lamp
Semi-Trailer Spread Axle Trailer
“S-C”
“S-E”
Lift Axle
Bendix® WS-24™
Wheel Speed Sensors
Left - “Road-Side”
Figure 33 – TABS‑6 ADV MC/MC LITE - Typical 4S/2M System with Front Lift Axle
4S/2M - AXLE CONTROL - Rear Lift Axle
0° Mounting Orientation
Dashed-line Box
Shows Lift Axle
Right - “Curb-Side”
Bendix® WS-24™ Wheel
Speed Sensors
Ground
Ignition
Power
A
Brake Lamp Power
B
Ignition Power
C
D
NC
Indicator Lamp
E
Ground
Load Sensor
(Optional)
5-Pin ABS
Connector
Brake Lamp Power
7-Pin SAE J560
Connector
“S-D”
Trailer Chassis Harness
“S-F”
Air Bellow
(where used)
P21
Bendix®
TABS‑6™
Advanced
MultiChannel
(MC)
Module
Control Line
Supply Line
Bendix® SR-5™
Trailer Spring
Brake Valve
P22
ABS Indicator Lamp
Semi-Trailer Tandem Axle Trailer
“S-E”
“S-C”
Bendix WS-24 Wheel
Speed Sensors
®
™
Left - “Road-Side”
Figure 34 – TABS‑6 ADV MC/MC LITE - 4S/2M Axle Control System with Rear Lift Axle
31
TROUBLESHOOTING: FLOWCHARTS
DTC information can be retrieved from the TABS‑6 ADV MC
module by using blink code diagnostics or a diagnostic tool.
To search DTCs and receive additional troubleshooting
support, refer to B2Bendix.com > Services & Support >
Diagnostic Trouble Code Search.
The following troubleshooting flowcharts will help the
technician isolate the cause and confirm whether the problem
resides in the component, wiring, or connectors.
Troubleshooting should always begin by observing the dashor trailer-mounted ABS indicator lamp during the TABS‑6 ADV
MC module's power-up sequence. If it is necessary to take
electrical measurements, always begin by taking voltage and
resistance measurements at the 7-pin or 12-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,
WSS, etc.
No voltage or resistance measurements are to be made on
the ECU electrical header connector pins of the module.
Section A: (Power-Up Sequence) Trailer-Mounted ABS Indicator Lamp . . . . . . . . . . . . . .
Section B: (Power-Up Sequence) Dash-Mounted ABS Indicator Lamp . . . . . . . . . . . . . . .
Section C: Troubleshooting the Trailer-Mounted ABS Indicator Lamp Circuitry . . . . . . .
Section D: Troubleshooting the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section E: Troubleshooting the WS-24 WSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section F: Troubleshooting the Load Sensor (Out-of-Range Condition) . . . . . . . . . . . . .
Section G: Troubleshooting an Automatic Lift Axle that Remains Lowered . . . . . . . . . .
Section H: Troubleshooting an Automatic Lift Axle that Remains Raised . . . . . . . . . . . .
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Page 44
SECTION A: POWER-UP SEQUENCE TRAILER-MOUNTED ABS INDICATOR LAMP
Observe the ABS indicator lamp at
power-up.
Apply ignition or brake light power.
Does the trailermounted ABS indicator
lamp immediately illuminate
when power is applied to the
trailer?
NO
Troubleshoot the trailer-mounted ABS
indicator lamp circuitry.
Go to Section C.
YES
Troubleshoot
the trailermounted ABS
indicator lamp
circuitry. Go to
Section C.
NO
Does the trailermounted ABS indicator lamp
stay ON for 6.5 seconds and
then turn OFF?
YES
Perform end-of-line test.
32
NO
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 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 dashmounted trailer ABS indicator lamp.
The 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
dash-mounted ABS
indicator lamp illuminate
within two (2) seconds of ignition
power being applied to the
vehicle?
NO
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 dash-mounted
trailer lamp circuit on the tractor.
The dash-mounted trailer ABS
indicator lamp stays ON. This is an
indication that the trailer ABS unit has
a Diagnostic Trouble Code (DTC).
If the dash-mounted trailer ABS
indicator lamp remains ON with no
trailer connected, troubleshoot the
dash-mounted trailer lamp circuit on
the tractor.
If the trailer ABS lamp remains ON
with a trailer connected, rerun the
power-up sequence for the trailermounted ABS indicator lamp. Go to
Section A.
NO
Does the
trailer-mounted
ABS indicator lamp
stay ON for 6.5
seconds and then
turn OFF?
YES
Perform
end-of-line test.
NO
Does the trailermounted ABS
indicator lamp stay ON for
2.5 seconds and then
turn OFF?
YES
The module is functioning
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