Pinpoint Test AT: DTC U0140:87

Instrumentation, Message Center and Warning Chimes

Pinpoint Test AT: DTC U0140:87

Normal Operation

- DTC U0140:87 (Lost Communication With Body Control Module: Missing Message)- sets in the Instrument Panel Cluster (IPC) if data messages received from the Smart Junction Box (SJB) over the High Speed Controller Area Network (HS-CAN) are missing for more than 5 seconds. For a complete list of all network messages, refer to Information Bus.

This pinpoint test is intended to diagnose the following:

- SJB (Smart Junction Box)

- IPC (Instrument Panel Cluster)

PINPOINT TEST AT : DTC U0140:87

AT1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.

- Verify that there is an observable symptom present.

Is an observable symptom present?

Yes
GO to AT2.

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.

AT2 CHECK THE COMMUNICATION NETWORK

- Ignition ON.

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

- Carry out the network test.

Does the SJB (Smart Junction Box) pass the network test?

Yes
GO to AT3.

No
REFER to Information Bus.

AT3 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) AND SJB (Smart Junction Box) SELF-TESTS

- Check for recorded DTCs from the IPC (Instrument Panel Cluster) and SJB (Smart Junction Box) self-tests.

Is DTC U3003:16 or DTC U3003:17 recorded in the IPC (Instrument Panel Cluster) or DTC B1317 or B1318 set in the SJB (Smart Junction Box)?

Yes
For the IPC (Instrument Panel Cluster) , GO to Pinpoint Test AY (U3003:16) Pinpoint Test AY: DTC U3003:16 or GO to Pinpoint Test AZ (U3003:17) Pinpoint Test AZ: DTC U3003:17.

For the SJB (Smart Junction Box) , REFER to Body Control Systems.

No
GO to AT4.

AT4 RECHECK THE IPC (Instrument Panel Cluster) DTCs

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 PMI (Programmable Module Installation) may not have been carried out.

- Clear the DTCs. Repeat the IPC (Instrument Panel Cluster) self-test.

Is DTC U0140:87 still present?

Yes
INSTALL a new SJB (Smart Junction Box). CLEAR the DTCs. REPEAT the self-test. If DTC U0140:87 is still present, INSTALL a new IPC (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) . 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.