Pinpoint Test J: DTC U0155

Auxiliary Brake System - Trailer Brake Control (TBC) Module

Pinpoint Tests

Pinpoint Test J: DTC U0155

Normal Operation

- DTC U0155 (Lost Communication With Instrument Panel Cluster (IC) Control Module) - this DTC sets in continuous memory or on-demand in the Trailer Brake Control (TBC) module if data messages received from the Instrument Panel Cluster (IPC) are missing. The IPC sends a TRAILER BRAKE CONFIG message to the TBC module. For a complete list of all network messages, refer to Instrumentation, Message Center, and Warning Chimes Information And Message Center.

This pinpoint test is intended to diagnose the following:

- IPC
- TBC module

PINPOINT TEST J: DTC U0155

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J1 VERIFY THE CUSTOMER CONCERN

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

Yes
GO to J2.

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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J2 CHECK THE COMMUNICATION NETWORK

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

Yes
GO to J3.

No
REFER to Module Communications Network Testing and Inspection.

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J3 RETRIEVE THE RECORDED DTCs FROM THE TBC MODULE AND IPC SELF-TESTS

- Check for recorded TBC module and IPC DTCs from the self-test.
- Is DTC U3003:16 (or B1318) or DTC U3003:17 (or B1317) recorded?

Yes
For DTC B1317 (TBC module), GO to Pinpoint Test D Pinpoint Test D: DTC B1317. For DTC B1318 (TBC module), GO to Pinpoint Test E Pinpoint Test E: DTC B1318. For the IPC, REFER to Instrumentation, Message Center, and Warning Chimes Testing and Inspection.

No
GO to J4.

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J4 CHECK FOR DTC U0155 SET IN OTHER MODULES

- Clear the DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0155:00 or DTC U0155 set in more than one module?

Yes
INSTALL a new IPC. REFER to Instrumentation, Message Center, and Warning Chimes Instrument Panel Cluster (IPC). CLEAR the DTCs. REPEAT the ABS module self-test.

No
INSTALL a new TBC module. REFER to Trailer Brake Control (TBC) Module Service and Repair. TEST the system for normal operation.

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