Pinpoint Test I: Lost Communication With IPC (Instrument Panel Cluster) Control Module U0155:87

Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information.

Normal Operation and Fault Conditions

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
BCM U0155:87	Lost Communication With Instrument Panel Cluster (IPC) Control Module: Missing Message	A continuous memory DTC that sets in the BCM if driver information messages received from the IPC through the GWM are missing.

Possible Sources

Communication network concern
Battery voltage concern
GWM
IPC
BCM

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

I1 CHECK THE COMMUNICATION NETWORK
- Perform a network test.
Does the IPC pass the network test?

Yes GO to I2

No DIAGNOSE no communication with the IPC. REFER to: COMMUNICATIONS NETWORK .

I2 RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE BCM (BODY CONTROL MODULE) SELF-TEST
- Clear the Diagnostic Trouble Codes (DTCs).
- Wait 10 seconds.
- Perform the BCM self-test.
Is DTC U3006:16 or U3006:17 recorded?

Yes For DTC U3006:16, GO to Pinpoint Test O For DTC U3006:17, GO to Pinpoint Test P

No GO to I3

I3 RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
- Perform the IPC self-test.
Are any voltage system related Diagnostic Trouble Codes (DTCs) recorded?

Yes REFER to: INSTRUMENTATION, MESSAGE CENTER AND WARNING CHIMES .

No GO to I4

I4 RECHECK THE BCM (BODY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Clear the Diagnostic Trouble Codes (DTCs).

Wait 10 seconds.

Perform the BCM self-test.

Is DTC U0155:87 present?

Yes

GO to I5

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.

I5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0155:87 SET IN OTHER MODULES
- Clear all Diagnostic Trouble Codes (DTCs).
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Retrieve all Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Is DTC U0155:87 set in other modules?

Yes GO to I6

No GO to I7

I6 CHECK FOR CORRECT IPC (INSTRUMENT PANEL CLUSTER) OPERATION

Ignition OFF.

Disconnect and inspect the IPC connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect the IPC connectors. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new IPC. Refer to INSTRUMENT PANEL CLUSTER (IPC) .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

I7 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all BCM connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect the BCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCM. Refer to Body Control Module (BCM) .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.