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 |
parked (red button on
tractor dash is pulled
out)?
YES
TEST: Release the trailer parking/spring
brakes by pushing in the red button.
ACTION:
• If the axle lifts, end the test.
• If the axle still does not lift, continue to
section G5.2.
NO
NO
G5.2 Are the service and
supply air connections via glad
hands complete?
ACTION:
• If the axle lifts, end the test.
• If axle still does not lift, continue to
section G5.3.
YES
G5.3 Is there pressure on
the supply side of the spring brake
valve?
Connect the glad hands.
NO
Troubleshoot the supply circuit.
When verified, continue to section
G5.4.
YES
G5.4
Is there a pressure
switch installed on the supply side of
the spring brake valve?
YES
Go to G5.5
Go to G6
40
NO
Install a normally closed pressure
switch and connect the harness
from the Electronic Control Unit
(ECU) to the pressure switch.
Contact your Bendix representative
for the correct part numbers to use
for the pressure switch and harness.
SECTION G: TROUBLESHOOTING AN AUTOMATIC LIFT AXLE
THAT REMAINS LOWERED (CONTINUED)
From G5.4
G5.5
Is the pressure switch a
normally closed switch?
NO
Change to a normally closed
pressure switch. Contact your Bendix
representative for the correct part
number to use.
Replace the switch.
ACTION:
YES
• If the axle lifts, end the test.
• If axle still does not lift, continue to
section G5.6.
G5.6 Test the
pressure switch
with the Bendix® ACom®
Diagnostic Software using the
component test for the input configured for
Lift Lower.
NO
Using the ACom Diagnostic Software,
configure the appropriate axle as a lift
axle.
ACTION:
Using the software, check the configuration
screen to see if the Electronic Control
Unit (ECU) is configured for
a lift axle. Is the ECU
configured for a lift
axle?
• If the axle lifts, end the test.
• If axle still does not lift, continue to
section G5.7.
YES
G5.7 Is the appropriate
Auxiliary Input/Output
(AUX I/O) configured as an output and for
function name LAC1 or LAC2
(Lift Axle Control - LAC)?
NOTE: The AUX I/O that is configured must match
the auxiliary pin and wiring on the harness
that is connected to the lift axle
solenoid.
NO
Configure the appropriate
output for LAC.
NOTE: For one (1) lift axle
or lift axle group (lift axles
controlled as a group),
use LAC1. For a second
independently controlled lift
axle or lift axle group, use
LAC2.
YES
Go to G6
41
SECTION G: TROUBLESHOOTING AN AUTOMATIC LIFT AXLE
THAT REMAINS LOWERED (CONTINUED)
G6 Troubleshooting
G6 The
Electronic Control Unit
(ECU) should be connected to
the lift axle solenoid via a lift axle harness and
an auxiliary pigtail harness. Is the correct lift axle harness
present and connected to both the lift axle solenoid and
the ECU auxiliary pigtail? Contact your Bendix
representative for the correct part
number for the lift axle
harness.
NO
YES
G7 Is the correct ECU
auxiliary pigtail being used?
Contact your Bendix representative for the
correct part number for the auxiliary pigtail
harness.
NO
YES
G8 To this point, wiring and
configuration appear to be correct.
Use the Bendix ACom Diagnostic Software’s
Component Test (Miscellaneous tab) to activate the
auxiliary I/O associated with the Lift Axle
Control (LAC). Does the lift axle lift?
YES
Install the correct lift axle harness, making
sure to connect to the lift axle solenoid, ECU,
and parking brake override pressure switch
(if present).
Install the correct harness with auxiliary pigtail and
plug in the lift axle harness to the auxiliary pigtail.
1. Check to see if the 6-pin mini DT auxiliary
connector is present.
2. Check to see that the lift axle harness is
plugged into the auxiliary connector.
3. Check to see if the lift axle harness is plugged
into the lift axle solenoid.
4. Use the Bendix® ACom® Diagnostic Software
to activate the Auxiliary Input/Output (AUX I/O)
associated with the Lift Axle Control (LAC).
• Does the lift axle lift?
• If lift axle does not lift, disconnect the
auxiliary lift axle harness from the solenoid
and measure the output voltage.
• If no voltage is found, disconnect the lift axle
harness from the auxiliary 6-pin pigtail and
measure the voltage on the appropriate pins
for the lift axle.
• Verify the 12-pin connector and the individual
pins on the 6-pin connector are properly
seated. If no voltage is found, contact the
Bendix Tech Team.
Wiring and plumbing are correct. Troubleshoot the
configuration.
Go to G1
NO
Go to G9
42
SECTION G: TROUBLESHOOTING AN AUTOMATIC LIFT AXLE
THAT REMAINS LOWERED (CONTINUED)
from previous page
G9 Disconnect the lift axle
harness from the solenoid and attach a
test light to the harness. Use the component test again
to activate output. Does the light come
on?
NO
Test the harness for continuity. Contact your
Bendix representative for the correct drawing
(pin out) for the lift axle and auxiliary pigtail
harness. If the problem persists, contact the
Bendix Tech team.
YES
G10
Troubleshoot the lift axle control using the
Bendix® ACom® Diagnostic Software. On the Configuration
window I/O tab, inspect the auxiliary function
parameters for LAC1 or LAC2. Is the Enable
Lift Axle at Standstill parameter set
to NO?
YES
The vehicle must be moving to lift the axle.
Either drive vehicle above 5 mph (8 kmh)
to see if the axle lifts, or set this parameter
to YES and see if the axle lifts.
NO
G10 Use the ACom Diagnostic Software to record the following information:
On the Bendix® Trailer Roll Stability Program (TRSP®) Sensors screen – Current Axle Load _______ (lbs)
On the Pressures screen – Load Port (Air Bag) P42 Pressure________(psi)
On the Configuration screen – AUX I/O tab, Auxiliary Function Parameters panel:
Weight where the Axle is Lowered _______ (lbs)
Weight where the Axle is Lifted _______ (lbs)
G11 Do
these values above
explain why the axle will not
lift?
NO
Contact your Bendix representative to assist in further
troubleshooting.
YES
Configure values to desired (allowable) values.
43
SECTION H: TROUBLESHOOTING AN AUTOMATIC LIFT AXLE
THAT REMAINS RAISED
Part One: Air Bag Checks
H1 Is the air bag port P42 connected
to the air suspension?
NO
Connect load port P42 to the suspension air bag on a fixed
axle at a location as far away from the height-control
valve as possible, preferably, directly to the air bag.
YES
H2 Is the load port (air bag)
P42 on the Electronic Control Unit
(ECU) valve, connected to a suspension air
bag on the lift axle?
YES
Move the connection from the lift axle suspension air bag
to the air bag on the fixed axle.
NO
H3 Is the trailer loaded such
that the axle should be in the lifted
position?
NO
Go to H4
44
YES
There is no issue. The axle is expected to be lifted in this
situation.
SECTION H: TROUBLESHOOTING AN AUTOMATIC LIFT AXLE
THAT REMAINS RAISED (CONTINUED)
Part Two: Other Checks
H4 Is the
technician expecting the
axle to be lowered because the trailer is
parked?
NO
Continue to section H8.
YES
H5 Is the trailer equipped with
a park circuit pressure switch in the
supply/red line that is connected electrically to the
Electronic Control Unit (ECU) using a
harness?
NO
Install a normally closed pressure switch and connect the
harness from the ECU to the pressure switch. Contact your
Bendix representative for the correct part numbers to use
for the pressure switch and harness.
YES
H6 Verify that the ECU has an
auxiliary input configured for a Lift Lower
function.
Is it configured?
NO
Configure the appropriate auxiliary input for the Lift Lower
function.
YES
NO
H7 Is the configured auxiliary input the
correct input based on the wiring of the auxiliary
pigtail harness and lift axle harness?
Configure the correct auxiliary input for the harness being
used.
YES
Go to H8
45
SECTION H: TROUBLESHOOTING AN AUTOMATIC LIFT AXLE
THAT REMAINS RAISED (CONTINUED)
from previous page
H8 Is there a separate control
mechanism on the trailer that will
override the Electronic Control Unit (ECU) Lift Axle
Control (LAC) and force the axle up?
(Overrides can either be an electrical switch or
a mechanical push-pull button.)
YES
Inspect to see if it is in the position that is overriding
the automatic lift axle system. Change its position,
if necessary, and continue to section H9.
NO
H9
Exercise caution when completing this step as the lift axle
may drop as a result.
Check that the ECU is activating the lift valve. This can be done either by
disconnecting the harness that connects to the lift axle solenoid,
or by using the Bendix® ACom® Diagnostic Software
component test to activate/deactivate the
output that is configured for LAC.
Does the axle
lower?
NO
The ECU is not
causing the
lift axle to be
raised. Inspect
and repair, if
necessary, the
plumbing of the
lift axle valve
and circuitry.
YES
The ECU is causing the lift axle to be raised. Use the ACom Diagnostic Software to look at the current loading conditions as
interpreted by the ECU to verify that the axle should be in the lowered position. If it is determined it should be in the lowered
position, contact the Bendix Tech Team.
H10 Use the ACom Diagnostic Software to record the following information:
On the Bendix® Trailer Roll Stability Program (TRSP®) Sensors screen – Current Axle Load _______ (lbs)
On the Pressures screen – Load Port (Air Bag) P42 Pressure________ (psi)
On the Configuration screen – AUX I/O tab, Auxiliary Function Parameters panel:
Weight where the Axle is Lowered _______ (lbs)
Weight where the Axle is Lifted _______ (lbs)
H1 Do these values
above explain why the axle will not
lower?
YES
Configure the values to desired (allowable) values.
46
NO
Contact your Bendix representative to assist
in further troubleshooting.
ECU Part Number Label
The external part number label is located above the control
port of the module. If this label is not legible for any reason,
the Bendix part number can be read from the ECU using a
diagnostic tool.
Software Revision Level
The number of the initial software loaded on the ECU is also
indicated. The current software revision number can be read
using a diagnostic tool.
BENDIX TECHNICAL ASSISTANCE
For additional assistance, the Bendix Tech Team can be
reached by email at techteam@bendix.com or by phone
at 1-800-AIR-BRAKE (1-800-247-2725), option 2. Bendix
Tech Team representatives are available Monday through
Thursday, 8:00 a.m. – 6:00 p.m., and Friday, 8:00 a.m. –
5:00 p.m. ET.
Document Revision Level
For additional information on Bendix products and to ensure
you have the latest version of the Service Data Sheet, visit
B2Bendix.com.
Document Description
Document Number
Bendix Single-Channel
TABS-6™ Advanced Module
SD‑13‑47671
Bendix® WS-24™ AntiLock Wheel
Speed Sensor
SD‑13‑4650
Bendix® TABS-8™ Advanced
Single-Channel Trailer ABS
Module
SD-13-47680
Spring Deflection (Load)
Sensor Installation for Spring
Suspensions
S-1588
®
Serial Number
Final Eight (8) Digits
Show Initial Software
Loaded
Bendix Part
Number
Figure 35 – Label information
47
APPENDIX A: REQUIRED INFORMATION FOR PROGRAMMING WITH BENDIX® ACOM® DIAGNOSTIC SOFTWARE
Record the following information:
Information for Programming with ACom Diagnostic Software
ECU orientation
Number of axles on the trailer
Tone ring size (standard size is 100)
Tire size in revolutions/mile (refer to the tire manufacturer’s website)
Are tires single or doubles for each wheel end?
Maximum weight in pounds rated for each axle of the trailer
Trailer weight in pounds when the trailer is empty
Suspension type used on the trailer (contact the suspension supplier)
Pressure value of the air suspension for the empty weight of the trailer
(contact the suspension supplier*)
Pressure value of the air suspension for the fully loaded weight of the trailer
(contact the suspension supplier*)
Distance from the kingpin to the center of the first axle
Distance between center of axle one (1) and axle two (2) for a two-axle trailer
(record the distance between any additional axles)
Offset distance in inches and whether the ECU is oriented toward the curbside or
roadside (if the module is offset from the vehicle’s center line more than ± 2 in.)
Track width (measurement between the outer edges of the outermost tires on the
axle with the WSS installed)
*: This information is also available via the Pressures screen in ACom Diagnostic Software (record the pressure value shown for P42 in PSI).
24/7/365 ACCESS
FULL SERVICE AT YOUR FINGERTIPS
1-800-AIR-BRAKE (1-800-247-2725)
TECHTEAM@BENDIX.COM
WEB-BASED TRAINING
LOG ON AND LEARN FROM THE BEST
Unless otherwise indicated, the trademarks used in this document, including Bendix,
are United States trademarks owned by, or licensed to, Bendix Commercial Vehicle Systems LLC.
48
SD-13-47672A Rev 002 © 1/2026 Bendix Commercial Vehicle Systems LLC, a member of Knorr-Bremse • All Rights Reserved
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