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.
2 in. (5 cm) from the center line of the trailer (unless
configured for an offset).
Figure 14 – Installation on Trailer (Center Line)
INSTALLING THE WSS
Use of cable ties/tie wraps to attach WSS leads to rubber
hoses/jounce lines is not approved. The hose may
expand during braking due to air pressure and the cable
tie may not, so the conductor material/insulation of the
WSS extensions may be damaged. Use only open-ended
clips be used to hold sensor leads to jounce lines.
Correct WSS installation is necessary for optimal ABS
operation.
Do not install sensors on a lift axle.
1. For increased corrosion protection, Bendix recommends
that a high-temperature-rated silicone or lithium-based
grease be applied to the interior of the mounting block,
the sensor, and to a new clamping sleeve.
2.
See Figure 2. Install the new clamping sleeve fully into
the block, with the retaining tabs toward the inside of
the vehicle. Note that WS-24 WSS must use the correct
clamping sleeve to avoid problems associated with
reduced retention force, such as sensor movement, and
resulting ABS DTCs.
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 in. (8-15 cm) from the sensor.
4. Apply a small amount of dielectric non-conductive
grease to both the sensor and the harness connectors.
5. Engage the connectors and push them together until
the lock tab snaps into place. It is permissible to use
an extra wire retainer (Bendix Part Number 300122,
or equivalent) – if available – to hold the connectors
together.
The friction fit allows the WSS to slide back and forth under
force, but to retain its position when the force is removed.
When the WSS is inserted all the way into the mounting block
and the wheel is installed on the axle, the tone ring contacts
the sensor, which pushes the sensor back. Also, normal
bearing play will “bump” the sensor away from the tone ring.
The combination of these two actions will establish a running
clearance, or air gap, between the sensor and the tone ring.
Refer to SD-13-4860, Bendix® WS-24™ Antilock WSS, on
B2Bendix.com for additional information.
16
ABS WIRING ON TOWING TRAILERS
For use on towing trailers, to minimize voltage-drop, the rearmounted SAE J560 connector MUST BE connected directly
to the front-mounted SAE J560 connector by a parallel wiring
harness to the trailer wiring harness.
Any auxiliary power circuit (non-braking and running gear)
shall be powered via the trailer ABS. The trailer ABS shall
provide power management to ensure the braking functions
are given priority. If the power requirement for the auxiliary
power circuit exceeds the maximum current allowed for the
AUX I/O, an external relay or electronic relay – which is to be
controlled by the trailer ABS – is acceptable for use. In this
case, it is the trailer manufacturer’s responsibility to ensure
this circuit is suitably designed and rated for the application
and the switch-off time is fast enough to ensure the braking
power supply is protected. This should be proven by practical
tests (contact your local Bendix representative).
LEAKAGE AND OPERATIONAL TESTS
For all NPTF fittings, the use of a thread sealant is
required. For NPTF fittings, the use of a thread sealant
is recommended. This can be a pre-applied or a handapplied sealant product (with PTFE). When using a
hand-applied sealant, use caution so as not to over apply.
Always follow the fitting manufacturer’s pre-applied or
hand-applied thread sealant recommendations. Use of
PTFE tape is not approved and will void the ABS valve
warranty.
1. Before performing the leakage tests, block the wheels.
2. F
ully charge the air brake system and verify proper brake
adjustment.
3. M
ake several trailer brake applications and check for
prompt application and release at each wheel.
4. Perform the leak-down test procedure:
• Set up the pressure circuits to apply emergency (red)
line and service pressures with a regulator and a
pressure gauge on each line.
• Apply 110 - 120 psi to the trailer emergency (red)
circuit to release the parking brake.
• Apply the service brakes at 90 - 95 psi.
• Identify and record the pressure from the gauge on
the emergency (red) line and the service line.
• Cut off the pressure to the emergency (red) line
before the pressure gauge and monitor the pressure.
If the pressure drops less than three (3) psi in one
(1) minute, the emergency (red) line test passes. If
the pressure drops more than three (3) psi in one (1)
minute, identify and correct the source of the leak on
the emergency (red) line.
• If the emergency (red) line test passes, repeat the
test for the service line. If the pressure drops less
than two (2) psi in one (1) minute, the test passes. If
the pressure drops more than two (2) psi in one (1)
minute, identify and correct the source of the leak
on the service line.
• A soap and water solution can be used to identify
sources of leaks on the fittings and valves.
• If available, a Lite-Check® machine can be used to
perform the leak-down test.
17
5. A
pply power and monitor the power-up sequence to verify
proper system operation. Refer to Section 11.
6. C
alibrate and set the odometer parameters, if necessary,
using a diagnostic tool. Refer to Section 12.
7. P
erform an installation test using a diagnostic tool.
Minimum tests that are required to verify the proper
installation of the ABS system are:
•E
CU Information: This test provides the user with
specific ECU information. It is required that no DTCs
(other than “installation test not completed”) are
present and that the ECU has been configured.
•W
heel-End Sequence Test: During this test, checks
are carried out that verify the correlation of the wheel
installed with a WSS and the pressure modulator that
controls the pressure to the associated brake.
•C
ustomer Scratch Pad: The tester is requested to
input data into the fields displayed on the screen. This
data will be stored in the ECU and also can be stored
to a file on the computer or printed out for reference.
8. W
here a safe location (i.e. 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 (32 kph) to check for proper function. The
wheels should not enter a prolonged lock condition and
the ABS function should be audible. It is the responsibility
of the technician to perform this test in a safe location.
ABS WIRING
MISCELLANEOUS MAINTENANCE
Disconnect the electrical connectors from the ABS
controller before welding on the trailer.
Glad Hand Maintenance
Apply dielectric grease to electrical connectors to help
protect against moisture intrusion.
All connector leads of the iTABS module pigtail harness are
weather-sealed at the connector interface and are clearly
labeled for proper installation.
Bendix provides over-molded versions of the iTABS module
wiring harness and Bendix recommends the complete
harness be replaced if corrosion or damage occurs.
•
NEVER POUR ANY LIQUIDS (alcohol, anti-freeze,
additives, etc.) into the glad hands. Liquids may
cause the o-rings and seals to swell, which may
result in lubrication loss and leave harmful residues.
•
Prevent nesting insects and contaminants from
entering and blocking the air hoses. Check that
screens are present and clean.
•
Drain the trailer air tanks a minimum of every six
(6) months.
•
Liquids/contaminants can cause TRAILER AIR
B R A K E FA I L U R E and/or the I N A B I L I T Y TO
RELEASE the trailer parking brakes.
When troubleshooting ABS wiring, some general rules should
be followed where applicable.
1. C
heck all wiring and connectors to ensure they are secure
and free from visible damage (i.e. cuts, abrasions, etc.).
2. C
heck for evidence of wire chafing due to poor routing
or poor securing of wires.
3. Check connectors for proper insertion and locking.
4. V
erify the connector pins are properly greased with a
non-conductive electrical grease compound.
5. C
onnector terminals must not show signs of corrosion or
exposure to the environment.
ABS Power-up Check
At power-up, the trailer ABS indicator lamp should briefly
illuminate “ON” as a bulb check.
If the indicator lamp does not illuminate at power‑up, the
ABS system may not be powered, or the bulb may need
to be replaced. Service the trailer ABS system.
•
6. Never pierce wire insulation when checking for continuity.
7. D
o not deform individual pins or sockets during probing
with a volt/ohm meter.
8. It is strongly recommended that all wiring harnesses and
sensor leads are properly secured at least every 18 in.
(46 cm).
9. A
pply a moderate amount of non-conductive electrical
grease to each connector pin before reconnecting.
If the lamp remains “ON” after power-up there may
be an active DTC. Service the trailer ABS system.
(To ensure full ABS functionality, service as soon
as possible.)
Other Important Practices:
•
Follow all standard industry safety practices.
•
Sealant for ABS fittings: Use pre- or hand-applied;
Never use PTFE tape (voids Bendix ABS warranty).
•
Use open-ended clips (never cable ties) to hold
sensor leads to jounce lines.
Use of cable ties/tie wraps to attach WSS leads to
rubber hoses/jounce lines is not approved. The hose
may expand during braking due to air pressure and the
cable tie may not, so the conductor material/insulation
of the WSS extensions may be damaged. Bendix instead
recommends only open-ended clips be used to hold
sensor leads to jounce lines.
18
•
Drain the trailer air tanks a minimum of every six
(6) months.
•
Disconnect the electrical connectors from the ABS
controller when welding on the trailer.
APPENDIX 1: TROUBLESHOOTING: FLOWCHARTS
DTC information can be retrieved from the iTABS module
by using blink code diagnostics or a diagnostic tool. The
following troubleshooting flowcharts will help the technician
isolate the cause and confirm whether the problem resides
in the component, wiring, or connectors.
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.
Troubleshooting should always begin by observing the
dash- or trailer-mounted ABS indicator lamp during the
iTABS 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 ECU pigtail harness
connector.
Section A: (Power-Up Sequence) Trailer-Mounted ABS Indicator Lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Section B: (Power-Up Sequence) Dash-Mounted ABS Indicator Lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Section C: Troubleshooting the Trailer-Mounted ABS Indicator Lamp Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Section D: Troubleshooting the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Section E: Troubleshooting the WS-24 WSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Section F: Troubleshooting the Tire Inflation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Section G: Troubleshooting the LPWE Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Section H: Troubleshooting the Pad Wear Sensing Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
SECTION A: POWER-UP SEQUENCE - TRAILER-MOUNTED ABS INDICATOR LAMP
Observe the ABS indicator
lamp at power-up.
Apply ignition or brake light power.
Troubleshoot the trailer-mounted
ABS indicator lamp circuitry.
Go to Section C.
(A1)
Does the
trailer-mounted
ABS indicator lamp
immediately illuminate when
power is applied to
the trailer?
NO
YES
Troubleshoot
the trailermounted ABS
indicator lamp
circuitry. Go to
Section C.
NO
(A3)
Does the
trailer-mounted ABS
indicator lamp stay on
permanently?
YES
Confirm that the installation test
has been executed. If yes, follow
additional ABS lamp troubleshooting
steps in Section C.
19
NO
(A2)
Does the
trailer-mounted ABS
indicator lamp stay on for 2.5
seconds and then
turn off?
YES
The module is functioning normally.
No service to the ABS unit is needed.
SECTION B: POWER-UP SEQUENCE - DASH-MOUNTED ABS INDICATOR LAMP
Verify that a PLC trailer is
connected to the tractor via the
7-pin connector. Turn the ignition
on and observe the dash-mounted
trailer ABS indicator lamp.
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.
(B1)
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 Section 7, SAE
J2497 Power Line Carrier (PLC)
Diagnostic Link.
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 the trailer ABS unit
has a DTC.
If the dash-mounted trailer ABS
indicator lamp remains “ON” with
no trailer connected, troubleshoot
the dash-mounted trailer lamp
circuit on the tractor.
If the trailer ABS lamp remains
“ON” with a trailer connected,
rerun the power-up sequence for
the trailer-mounted ABS indicator
lamp. Go to Section A.
NO
YES
(B3)
Does
the trailermounted ABS
indicator lamp stay
on permanently?
YES
Confirm that the
installation test has
been executed. If yes,
follow additional ABS
lamp troubleshooting
steps in Section C.
20
NO
(B2)
Does the
trailer-mounted ABS
indicator lamp stay on
for 2.5 seconds
and then turn
off?
YES
The module is
functioning normally.
No service to the ABS
unit is needed.
SECTION C: TROUBLESHOOTING THE TRAILER-MOUNTED ABS INDICATOR LAMP CIRCUITRY
(C1)
Is the tractor
ignition or battery box (if not using
tractor as power source) switched
on?
YES
(C2)
Is SAE J560 cable
(green, spiral) connected from tractor/
battery box to trailer?
NO
Switch on the ignition and recheck if the
trailer ABS indicator lamp does a power on
check. Go to Section B.
NO
Connect a SAE J560 cable. Verify that
the ABS warning lamp turns on and off
during ignition power-up.
YES
(C3)
Check the
tractor for constant power
(blue wire). Does the trailer ECU
perform an ABS indicator lamp power-on test when
the brake is applied while the trailer
is stationary?
NO
Troubleshoot the main trailer power
harness for mis-wiring, open circuits, and/or
short circuits.
Looking into the iTABS module 7-pin
Connector Pigtail Harness. Pin 3 is the
ground pin. Pin 4 is the ABS indicator
lamp pin.
YES
Add constant power (blue wire) to the center pin of
the SAE J560 connector.
ACTION: If the trailer-mounted ABS indicator
lamp remains on after the standard power-up
time interval of approximately 2.5 seconds.
ACTION: If the trailer-mounted ABS indicator
lamp did not illuminate during the power-up
sequence:
Determine if a module DTC exists using any of
the following methods:
Troubleshoot the power supply to the
ABS module. Go to Section D. Continue if the power
and ground wiring are OK.
•
Blink Code Diagnostics, Section 16
•
Troubleshooting, Section 19
Turn off the power to the module. Inspect the
condition of the ABS indicator lamp, connector and
ground. Using a volt/ohm meter, verify continuity from
the trailer chassis ground (pin 3) to the
ground pin of the indicator lamp.
If no DTCs are found, the ABS module appears to be
functioning normally, but the ABS lamp remains “ON,”
continue to the next step.
If DTC(s) exist and repairs are made, rerun the
power-up sequence. Go to Section A.
If repairs are made, rerun the power-up sequence.
Go to Section A.
Continue if the indicator lamp and
ground wire check out OK.
With power off to the ABS module, disconnect
the 7-pin ECU connector. Verify continuity from the
ABS indicator lamp pin (pin 4) of the ECU connector to
the ABS indicator lamp connector. If repairs are made,
rerun the power-up sequence. Go to Section A. If the
condition persists, contact the Bendix Tech Team.
21
With power off to the ABS module, disconnect
the 7-pin ECU connector. Apply power to the trailer. If
the ABS lamp illuminates, there is a voltage short on
the lamp circuit. Troubleshoot, repair, and retest.
Use a volt meter to check if there is a short to the
voltage on the warning lamp circuit between the ABS
indicator lamp pin (pin 4) and the lamp.
If repairs are made, rerun the power-up sequence.
Go to Section A. If the condition persists,
contact the Bendix Tech Team.
SECTION D: TROUBLESHOOTING THE POWER SUPPLY
Turn off the power to the module
and disconnect the 7-pin ECU
connector.
Check for high resistance
(corrosion, wire/connector damage
or improper termination) of the
- 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...
- Both wet and dry boiling points exceed the minimum...
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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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