Pinpoint Tests AT: DTC U0137

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AT: DTC U0137

Normal Operation
- The Instrument Cluster (IC) sets DTC U0137 if data messages received from the Trailer Brake Control (TBC) module over the
High Speed Controller Area Network (HS-CAN) are missing. For a complete list of all network messages, refer to Information Bus.

This pinpoint test is intended to diagnose the following:

- TBC module
- IC



PINPOINT TEST AT: DTC U0137

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AT1 VERIFY THE CUSTOMER CONCERN


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

Yes
GO to AT2.

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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AT2 CHECK THE COMMUNICATION NETWORK


- Ignition ON.
- 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 AT3.

No
REFER to Information Bus.

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AT3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Check for recorded IC DTCs from the self-test.
- Is DTC B1317 or DTC B1318 recorded?

Yes
GO to Pinpoint Test AN (B1317) or GO to Pinpoint Test AO (B1318). Pinpoint Tests AN: DTC B1317 Pinpoint Tests AO: DTC B1318

No
GO to AT4.

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AT4 RECHECK THE IC DTCs


NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the Programmable Module Installation (PMI) or the PMI may not have been carried out.

- Clear the DTCs. Repeat the IC self-test.
- Are any DTCs present?

Yes
For DTC U0137, INSTALL a new TBC module. REFER to Trailer Brake Control Module. CLEAR the DTCs. REPEAT the IC self-test.

If DTC U0137 is still present, INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

For DTC U261A, CARRY OUT the IC PMI. REFER to Information Bus. CLEAR the DTCs. REPEAT the self-test. Programming and Relearning

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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