Pinpoint Test B: DTC U0104:87

Body Control Module (BCM)

Pinpoint Test B: DTC U0104:87

Normal Operation

- DTC U0104:87 (Lost Communication With Cruise Control Module: Missing Message)- sets in the Body Control Module (BCM) if data messages received from the Cruise-Control Module (C-CM) are missing. For a complete list of all network messages, refer to Information Bus.

This pinpoint test is intended to diagnose the following:

- Communication network concern

- C-CM (Cruise-Control Module)

- BCM (Body Control Module)

PINPOINT TEST B : DTC U0104:87

B1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.

- Verify there is an observable symptom present.

Is an observable symptom present?

Yes
GO to B2.

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.

B2 CHECK THE COMMUNICATION NETWORK

- Ignition ON.

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

- Carry out the network test.

Does the C-CM (Cruise-Control Module) pass the network test?

Yes
GO to B3.

No
REFER to Information Bus, The Cruise-Control Module (C-CM) Does Not Respond To The Scan Tool Pinpoint Test U: The Cruise-Control Module (C-CM) Does Not Respond To The Scan Tool.

B3 RETRIEVE THE RECORDED DTCs FROM THE BCM (Body Control Module) SELF-TEST

- Check for recorded BCM (Body Control Module) DTCs from the self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?

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

For DTC U3003:17, GO to Pinpoint Test H. Pinpoint Test H: DTC U3003:17

No
GO to B4.

B4 CHECK FOR DTCs U3003:16 AND U3003:17 FROM THE C-CM (Cruise-Control Module) SELF-TEST

- Retrieve the continuous memory DTCs from the C-CM (Cruise-Control Module).

Is DTC U3003:16 or DTC U3003:17 recorded?

Yes
REFER to Cruise Control.

No
GO to B5.

B5 RECHECK THE BCM (Body Control Module) DTCs

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

- Enter the following diagnostic mode on the scan tool: BCM (Body Control Module) Self-Test.

- Clear the DTCs. Repeat the BCM (Body Control Module) self-test.

Is DTC U0104:87 still present?

Yes
GO to B6.

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.

B6 CHECK FOR DTC U0104:87 SET IN OTHER MODULES

- Clear the 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 U0104:87 set in any other module?

Yes
INSTALL a new C-CM (Cruise-Control Module). CLEAR the DTCs. REPEAT the BCM (Body Control Module) self-test.

No
INSTALL a new BCM (Body Control Module). REFER to Body Control Module (BCM) Body Control Module (BCM). TEST the system for normal operation.