Pinpoint Tests AH: DTC U0140

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AH: DTC U0140

Normal Operation
- DTC U0140 (Lost Communication With Body Control Module (GEM)) - sets in the Instrument Cluster (IC) if data messages received from the Smart Junction Box (SJB) over the High Speed Controller Area Network (HS-CAN) are missing.

This pinpoint test is intended to diagnose the following:

- SJB
- IC



PINPOINT TEST AH: DTC U0140

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AH1 VERIFY CUSTOMER CONCERN


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

Yes
GO to AH2.

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

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AH2 CHECK THE COMMUNICATION NETWORK


- 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 AH3.

No
REFER to Information Bus.

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AH3 RETRIEVE THE RECORDED DTCs FROM THE CONTINUOUS AND ON-DEMAND IC SELF-TESTS


- Check for recorded IC DTCs from the continuous and on-demand self-tests.
- Is DTC B1317 or B1318 recorded?

Yes
For DTC B1317, Go To Pinpoint Test AB. Pinpoint Tests AB: DTC B1317

For DTC B1318, Go To Pinpoint Test AC. Pinpoint Tests AC: DTC B1318

No
GO to AH4.

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AH4 RECHECK THE IC CONTINUOUS MEMORY 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) may not have been carried out.

- Enter the following diagnostic mode on the scan tool: IC Self-Test.
- Clear the DTCs. Repeat the IC self-test.
- Is DTC U0140 still present?

Yes
GO to AH5.

No
The system is operating correctly at this time. The DTC may have been set due to high network traffic.

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AH5 CHECK FOR DTC U0140 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 set in the Audio Control Module (ACM) or HVAC module?

Yes
INSTALL a new SJB. TEST the system for normal operation.

No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

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