NHTSA ID Number: 11034109
Manufacturer Communication Number: SD-20-47682
TSB/Document Date: 2026-06-27
Summary
Service Data - Bendix
® iTABS™ X Standard Single-Channel (SC) Trailer Antilock Braking System (ABS) Module - The Bendix® iTABS™ X Standard Single-Channel (SC) Module (hereafter referred to as the iTABS module) is an integrated single-channel (2S/1M) trailer service brake module controller for air-braked, heavy-duty semi-trailers that features the Bendix® Antilock Braking System (ABS). Installed on semi-trailers, the iTABS module acts as a relay valve during normal braking, but during ABS events, it will intervene to help maintain vehicle stability and minimize stopping distance by preventing wheel lock-up.
YES
(G2)
Using
ACom Diagnostic
Software, go to the AUX
tab and check under auxiliary function
parameters. Is the LPWE INVERTED
MODE option set to
NO?
NO
Go into the ACom AUX I/O configuration.
Change the AUX I/O or one of the tristate
inputs to INPUT and select iLPWE in
the FUNCTION NAME. Ensure INPUT
INVERTED MODE is set to NO and the ABS
warning lamp is checked. Click WRITE and
verify the status in the PLC message.
Change the option to NO, write the
configuration change, and verify the status
of the PLC message is correct.
YES
(G3)
Unplug the
pressure switch of the LPWE
harness and measure the continuity across
the terminals of the switch (point 1 in the LPWE
diagram). Is there continuity?
NO
Go to (G4) - next page
29
YES
The threshold switch
does not appear to be
working. Replace the
threshold switch.
SECTION G: TROUBLESHOOTING LPWE FEATURE (CONTINUED)
SCENARIO 1: LOW PRESSURE CONDITION PRESENT (BELOW 65 PSI WITH NORMALLY
OPEN PRESSURE SWITCH), BUT PLC MESSAGE STATUS IS INACTIVE
Continued from previous page
Plug the pressure switch back into
the LPWE harness.
(G4)
Measure
the continuity across the pins
of the LPWE harness (point 3 in the
LPWE diagram). Is there
continuity?
YES
Troubleshoot the LPWE
harness for damage. NOTE: Verify
the part number of the LPWE and
check the harness for damage.
NO
Power cycle the
ECU.
(G5)
Is the status on
the PLC message incorrect after
the power cycle?
NO
Complete.
YES
•
•
•
•
Go into ACom Diagnostic Software AUX I/O configuration.
Set the SE from INPUT to N/A and click WRITE.
Change the SE back to INPUT and select iLPWE in the Function Name. Ensure INPUT
INVERTED MODE is set to NO, and the ABS warning lamp is checked.
Click WRITE and verify the status in the PLC message. If the status is still incorrect,
contact the Bendix Tech team.
If using a normally closed pressure switch, reverse the logic of the steps above.
30
SECTION G: TROUBLESHOOTING LPWE FEATURE
SCENARIO 2: LOW PRESSURE CONDITION NOT PRESENT (ABOVE 65 PSI WITH
NORMALLY OPEN PRESSURE SWITCH), BUT PLC MESSAGE STATUS IS ACTIVE
Using ACom Diagnostic Software,
look at the data monitor window
switches tab for the parking brake
switch status (PID 70).
(G6)
Is the PID
70 park brake switch status
available on the monitor
window?
NO
YES
(G7)
Using
ACom Diagnostic
Software, go to the AUX
tab and check under auxiliary function
parameters. Is the LPWE INVERTED
MODE option set to
NO?
NO
Go into the ACom AUX I/O configuration.
Change the AUX I/O or one of the tristate
inputs to INPUT and select iLPWE in
the FUNCTION NAME. Ensure INPUT
INVERTED MODE is set to NO and the ABS
warning lamp is checked. Click WRITE and
verify the status in the PLC message.
Change the option to NO, write the
configuration change, and verify the status
of the PLC message is correct.
YES
(G8)
Unplug the
pressure switch of the LPWE
harness and measure the continuity across the
terminals of the switch (point 1 in the LPWE diagram).
Is there continuity?
NO
Plug the pressure switch back into
the LPWE harness.
Go to (G9) - next page
31
YES
The threshold switch
does not appear to be
working. Replace the
threshold switch.
SECTION G: TROUBLESHOOTING LPWE FEATURE (CONTINUED)
SCENARIO 2: LOW PRESSURE CONDITION NOT PRESENT (ABOVE 65 PSI WITH
NORMALLY OPEN PRESSURE SWITCH), BUT PLC MESSAGE STATUS IS ACTIVE
Continued from previous page
(G9)
Measure the continuity
across the pins of the LPWE harness
(point 3 in the LPWE diagram).
Is there continuity?
NO
Troubleshoot the LPWE
harness for damage.
YES
Power cycle the
ECU.
(G10)
Is the status on
the PLC message incorrect after
the power cycle?
NO
Complete.
YES
•
•
•
•
Go into ACom Diagnostic Software AUX I/O configuration.
Set the AUX I/O or one of the tristate inputs from INPUT to N/A and click WRITE.
Change the AUX I/O or one of the tristate inputs back to INPUT and select iLPWE
in the Function Name. Ensure INPUT INVERTED MODE is set to NO, and the ABS
warning lamp is checked.
Click WRITE and verify the status in the PLC message. If the status is still
incorrect, contact the Bendix Tech team.
If using a normally closed pressure switch, reverse the logic of the steps above.
32
SECTION G: TROUBLESHOOTING LPWE FEATURE
SCENARIO 3: PLC MESSAGE IS NOT BROADCASTING
Using ACom Diagnostic Software,
look at the data monitor window for
available messages.
(G11)
Do any
messages from the
trailer appear (i.e., MID 10
or MID 11)?
NO
(G12)
Is the power
light on and is the data
light blinking on the diagnostic
adapter?
NO
Verify the
ignition power
to the trailer
and diagnostic
connection.
YES
(G13)
Using ACom
Diagnostic Software, go to the
AUX I/O tab. Is it configured as
INPUT FOR iLPWE?
NO
Go into the ACom AUX I/O configuration.
Change the AUX I/O or one of the tristate
inputs to INPUT and select iLPWE in the
FUNCTION NAME. Ensure INPUT INVERTED
MODE is set to NO and the ABS warning lamp
is checked. Click WRITE and verify the status
in the PLC message.
YES
Power cycle the ECU.
(G14)
Is the PLC message
now present after the power
cycle?
YES
Complete.
NO
•
•
•
•
Go into ACom Diagnostic Software AUX I/O configuration.
Set the AUX I/O or one of the tristate inputs from INPUT to N/A and click WRITE.
Change the AUX I/O or one of the tristate inputs back to INPUT and select iLPWE in the
Function Name. Ensure INPUT INVERTED MODE is set to NO, and the ABS warning
lamp is checked.
Click WRITE and verify the status in the PLC message. If the status is still incorrect,
contact the Bendix Tech team.
If using a normally closed pressure switch, reverse the logic of the steps above.
33
SECTION H: TROUBLESHOOTING PAD WEAR (PW) SENSING FEATURE
SCENARIO 1: BRAKE PAD WORN, BUT DTC IS INACTIVE
TRISTATE
INPUT OR AUX
I/O 1
The following troubleshooting steps are designed to identify issues with the messaging and performance of the iTABS ECU.
Additional functionality for the PLC relay unit should also be considered and confirmed as part of these troubleshooting steps.
PW Feature Diagram
Using ACom Diagnostic Software,
look at the data monitor window for any
active DTC messages.
(H1)
Does the PID
70 BRAKE PADS WORN
message show up in the status
window?
NO
Go into the ACom AUX I/O
configuration. Change the AUX I/O or one of
the tristate inputs to INPUT and select PW
in the FUNCTION NAME. Click WRITE and
verify the status in the PLC message.
YES
Disconnect the PW
harness from the ECU.
(H2)
Measure
the continuity across the
pins of the PW harness (point 3 in the
PW feature diagram). Is there
continuity?
NO
Power cycle the ECU.
Go to (H3) - next page
34
YES
Troubleshoot the
PW harness for a
short circuit.
SECTION H: TROUBLESHOOTING PAD WEAR (PW) SENSING FEATURE
(CONTINUED) - SCENARIO 1: BRAKE PAD WORN, BUT DTC IS INACTIVE
Continued from previous page
(H3)
Is the status on
the PLC message incorrect after
the power cycle?
NO
Complete.
YES
•
•
•
•
Go into ACom Diagnostic Software AUX I/O configuration.
Set the AUX I/O or one of the tristate inputs configured for Pad Wear (PW)
from INPUT to N/A. Click WRITE.
Change the AUX I/O or one of the tristate inputs back to INPUT and select PW
in the Function Name.
Click WRITE and verify the status in the PLC message. If the status is still
incorrect, contact the Bendix Tech team.
SECTION H: TROUBLESHOOTING PAD WEAR (PW) SENSING FEATURE
SCENARIO 2: BRAKE PAD NOT WORN, BUT DTC IS ACTIVE
Using ACom Diagnostic Software,
look at the status window for any active
DTC messages.
(H4)
Does the PID
70 BRAKE PADS WORN
message show up in the status
window?
YES
Go to (H5) - next page
35
NO
No PW condition is currently
active. Troubleshoot the PLC relay.
SECTION H: TROUBLESHOOTING PAD WEAR (PW) SENSING FEATURE
(CONTINUED) SCENARIO 2: BRAKE PAD NOT WORN, BUT DTC IS ACTIVE
Continued from previous page
(H5)
Using
ACom Diagnostic
Software, verify the PW
configuration. Is the PW configured on
the AUX I/O or one of the tristate inputs
input that the PW harness is
connected to?
NO
YES
Correctly configure
the Pad Wear (PW)
input on AUX I/O or
one of the tristate
inputs.
Disconnect the PW harness from the ECU.
(H6)
Measure
the continuity across the
pins of the PW harness (point 3 in the
PW feature diagram). Is there
continuity?
NO
Troubleshoot the
PW harness for an
open circuit.
YES
Power cycle
the ECU.
(H7)
Is the status on
the PLC message incorrect after
the power cycle?
NO
Complete.
YES
•
•
•
•
36
Go into ACom Diagnostic Software AUX I/O configuration.
Set the AUX I/O or one of the tristate inputs configured for PW from INPUT to N/A. Click WRITE.
Change the AUX I/O or one of the tristate inputs back to INPUT and select PW in the Function Name.
Click WRITE and verify the status in the PLC message. If the status is still incorrect, contact the
Bendix Tech team.
SECTION H: TROUBLESHOOTING PAD WEAR (PW) SENSING FEATURE
SCENARIO 3: PLC MESSAGE IS NOT BROADCASTING
Using ACom Diagnostic Software,
look at the status window for any
active Diagnostic Trouble Code (DTC)
messages.
(H8)
Do any
messages from the
trailer appear (i.e., MID 10
or MID 11)?
NO
(H9)
Is the
power light on and
is the data light blinking on the
diagnostic adapter?
NO
Verify the
ignition power
to the trailer
and diagnostic
connection.
YES
(H10)
Using ACom
Diagnostic Software, go to
the AUX I/O tab and verify the correct input is
configured for Pad Wear (PW). Is
the input configured
correctly?
NO
Under TYPE, select INPUT.
Under FUNCTION, select PW.
Click WRITE and verify the
PLC status is broadcasting.
YES
Power cycle the ECU.
(H11)
Is the PLC
message incorrect after the
power cycle?
YES
Complete.
NO
•
•
•
•
37
Go into ACom Diagnostic Software AUX I/O configuration.
Set the AUX I/O or one of the tristate inputs from INPUT to N/A. Click WRITE.
Change the AUX I/O back to INPUT and select PW in the Function Name.
Click WRITE and verify the status in the PLC message. If the status is still incorrect,
contact the Bendix Tech team.
SECTION H: TROUBLESHOOTING PAD WEAR (PW) SENSING FEATURE
SCENARIO 4: IDENTIFYING THE SOURCE OF A PW DTC
Isolate/disconnect the axle harness that is
furthest away from the iTABS module. Short the
pins on the connector of the harnessing that is still
connected to the ECU.
Power
cycle the
ECU. Did the PW DTC
become inactive OR did the PLC
relay lamp turn off?
YES
The PW condition has been isolated to the
axle harness that has just been disconnected.
Troubleshoot the axle harness, extensions,
shorting cap (if applicable), and PW sensors
on this axle.
NO
Isolate the next axle harness that is
furthest away from the iTABS module.
Short the pins on the connector of the
harness that is still connected to the
ECU.
38
Power cycle the ECU
and confirm the DTC and/or
PLC relay lamp is off.
Any references in this document to TE Connectivity, Packard, Lite-Check, any other company or trademark
are solely for identification and cross reference purposes. The trademarks are the property of their respective companies.
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.
SD-20-47682 Rev 000 © 5/2026 Bendix Commercial Vehicle Systems LLC, a member of Knorr-Bremse • All Rights Reserved
- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
- Ideal for hydraulic and disc brakes
- Provides an extra margin of safety in extreme braking...
- Mix of polyglycol ethers ensures hot brake-system operation...
- Excellent for ABS, disc and drum brake systems
- Delivers braking power when needed by avoiding a spongy...
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Last update on 2026-06-23 / Affiliate links / Images from Amazon Product Advertising API
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TSB/Document ID: SD-20-47682
Replacement Service Bulletin Number:
MFR Communication Date: 2026-05-23
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES
MFR Component System: Trailer ABS
MFR Component Subsystem:
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