Pinpoint Test AG: DTC U0155:87

Adaptive Headlighting

Pinpoint Test AG: DTC U0155:87

- DTC U0155:87 (Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information) - sets continuous by the HCM if data messages (ignition switch status, headlamps on status) received from the IPC over the HS-CAN are missing. For a complete list of all network messages, refer to Module Communications Network Testing and Inspection.

The Smart Junction Box (SJB) communicates the headlamps on status to the IPC over the Medium Speed Controller Area Network (MS-CAN). The IPC acts as a gateway module and relays the information through the High Speed Controller Area Network (HS-CAN) to the HCM.

This pinpoint test is intended to diagnose the following:

- HCM
- IPC


PINPOINT TEST AG: U0155:87

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.

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AG1 VERIFY THE CUSTOMER CONCERN

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

Yes
GO to AG2.

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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AG2 CHECK THE COMMUNICATION NETWORK

- 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 AG3.

No
REFER to Module Communications Network Testing and Inspection.

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AG3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded DTCs from the HCM self-test.
- Is DTC U3003:16 or DTC U3003:17 recorded?

Yes
For DTC U3003:16, GO to Pinpoint Test AH. Pinpoint Test AH: DTC U3003:16

For DTC U3003:17 GO to Pinpoint Test AI. Pinpoint Test AI: DTC U3003:17

No
GO to AG4.

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AG4 RECHECK THE HCM DTCs

- Enter the following diagnostic mode on the scan tool: HCM Self-Test.
- Clear the DTCs. Repeat the HCM self-test.
- Is DTC U0155:87 still present?

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

If DTC U0155:87 is still present, INSTALL a new HCM. REFER to Headlamp Control Module (HCM) Service and Repair. TEST the system for normal operation.

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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