Pinpoint Test AC: DTC U0155:00

Adaptive Headlighting

Pinpoint Test AC: DTC U0155:00

- U0155:00 (Lost Communication With Instrument Panel Cluster (IPC (Instrument Panel Cluster)) Control Module: No Sub Type Information)- set by the Headlamp Control Module (HCM) if data messages (ignition switch status, headlamps on status) received from the Instrument Panel Cluster (IPC) over the HS-CAN (High Speed Controller Area Network) are missing for greater than 5 seconds. For a complete list of all network messages, refer to Information Bus.

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

This pinpoint test is intended to diagnose the following:

- HCM (Headlamp Control Module)

- IPC (Instrument Panel Cluster)

PINPOINT TEST AC : U0155:00

AC1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.

- Verify that there is an observable symptom present.

Is an observable symptom present?

Yes
GO to AC2.

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

AC2 CHECK THE COMMUNICATION NETWORK

- Enter the following diagnostic mode on the scan tool: Network Test.

- Carry out the network test.

Does the IPC (Instrument Panel Cluster) pass the network test?

Yes
GO to AC3.

No
REFER to Information Bus.

AC3 RECHECK THE HCM (Headlamp Control Module) DTCs

NOTE: If a new IPC (Instrument Panel Cluster) was installed prior to the DTC being set, the module configuration may be incorrectly set during the Programmable Module Installation (PMI) or the PMI (Programmable Module Installation) may not have been carried out.

- Clear the DTCs. Repeat the HCM (Headlamp Control Module) self-test.

Is DTC U0155 still present?

Yes
GO to AC4.

No
REFER to Information Bus.

AC4 CHECK FOR DTC U0155 SET IN OTHER MODULES

- Clear all 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 U0155 set in the SJB (Smart Junction Box) or the PCM?

Yes
INSTALL a new IPC (Instrument Panel Cluster). CLEAR the DTCs. REPEAT the self-test.

No
INSTALL a new HCM (Headlamp Control Module). REFER to Headlamp Control Module (HCM) . CLEAR the DTCs. REPEAT the self-test.