Pinpoint Test AA: DTC U0137:00

Anti-Lock Control - Four-Channel

Pinpoint Tests

Pinpoint Test AA: DTC U0137:00

Normal Operation
- DTC U0137:00 (Lost Communication With Trailer Brake Control Module: No Sub Type Information) - a continuous memory DTC set by the ABS module if the trailer brake data that should be received from the Trailer Brake Control (TBC) module is missing for 5 seconds or longer.

This pinpoint test is intended to diagnose the following:
- Communication network concern
- TBC module
- ABS module

PINPOINT TEST AA: DTC U0137:00

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AA1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.
- Verify there is an observable symptom present.
- Is an observable symptom present?

Yes
GO to AA2.

No
The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

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AA2 CHECK THE COMMUNICATION NETWORK

- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the TBC module pass the network test?

Yes
GO to AA3.

No
REFER to Module Communications Network Testing and Inspection.

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AA3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE AND TBC MODULE SELF-TESTS

- Check for recorded ABS and TBC DTCs from the self-test.
- Is DTC B11E8:16 (or B1318) or DTC B11E8:17 (or B1317) recorded?

Yes
For DTC B11E8:16, GO to Pinpoint Test P. For DTC B11E8:17, GO to Pinpoint Test Q. For the TBC module, REFER to Auxiliary Brake System Testing and Inspection. Pinpoint Test P: DTC B11E8:16 Pinpoint Test Q: DTC B11E8:17

No
GO to AA4.

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AA4 RECHECK THE ABS MODULE DTCs

- Clear the DTCs.
- Wait 10 seconds.
- Repeat the ABS module self-test.
- Is DTC U0137:00 still present?

Yes
GO to AA5.

No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

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AA5 CHECK FOR DTC U0137:00 IN OTHER MODULES

- Clear the DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Enter the following diagnostic mode on the scan tool: Self-Test.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0137:00 set in the IPC?

Yes
INSTALL a new TBC module. REFER to Auxiliary Brake System Service and Repair. CLEAR the DTCs. REPEAT the ABS module self-test.

No
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module Service and Repair. TEST the system for normal operation.

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