Pinpoint Test G: DTC U0140:87

Body Control Module B (BCM-B)

Pinpoint Tests


Pinpoint Test G: DTC U0140:87

Normal Operation

The Body Control Module B (BCM-B) monitors the ignition switch position messages from the SJB over the Medium Speed Controller Area Network (MS-CAN), and if it does not receive an ignition switch position message from the SJB in more than 5 seconds, the BCM-B will set this DTC in continuous memory. The BCM-B monitors the MS-CAN for this information with a data sampling rate of once every 10 milliseconds.

- DTC U0140:87 (Lost Communication With Body Control Module: Missing Message) - set by the BCM-B if data messages received from the SJB over the MS-CAN are missing for 5 seconds or longer.
- DTC U0422:68 (Invalid Data Received From Body Control Module: Event Information) - a continuous memory and on-demand DTC that sets when the BCM-B does not receive an ignition status message for longer than 3 seconds with an ignition switch position message having been received.

This pinpoint test is intended to diagnose the following:


- Module communication
- BCM-B
- SJB



PINPOINT TEST G: DTC U0140:87

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G1 VERIFY CUSTOMER CONCERN


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

Yes
GO to G2.

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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G2 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 pass the network test?

Yes
GO to G3.

No
REFER to Information Bus.

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G3 RETRIEVE THE RECORDED DTCs FROM THE SELF-TEST


- Check for recorded BCM-B DTCs from the self-test.
- Is DTC U3003:62 recorded?

Yes
GO to Pinpoint Test F. Pinpoint Test F: DTC U3003:62

No
GO to G4.

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G4 RECHECK THE BCM-B 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 may not have been carried out.

- Clear the DTCs. Repeat the BCM-B self-test.
- Is DTC U0140:87 still present?

Yes
GO to G5.

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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G5 CHECK FOR DTC U0140:87 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 U0140:87 set in the Audio Control Module (ACM), Accessory Protocol Interface Module (APIM), Front Controls Interface Module (FCIM), Global Positioning System Module (GPSM) (if applicable), HVAC module, Instrument Panel Cluster (IPC), or the Restraints Control Module (RCM)?

Yes
INSTALL a new SJB. REFER to Smart Junction Box (SJB) Smart Junction Box (SJB).

No
INSTALL a new BCM-B. REFER to Body Control Module B (BCM-B) Body Control Module B (BCM-B).

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