Pinpoint Test AB: DTC U0140

Handles, Locks, Latches and Entry Systems

Pinpoint Tests

Pinpoint Test AB: DTC U0140

The Driver Door Module (DDM) and the Smart Junction Box (SJB) communicate using the Medium Speed Controller Area Network (MS-CAN). Messages are exchanged between the modules on the MS-CAN for the purposes of determining what functions are being carried out.

- DTC U0140 (Lost Communication With Body Control Module (GEM) - set by the DDM if data messages received from the Smart Junction Box (SJB) over the Medium Speed Controller Area Network (MS-CAN) are missing for 15 seconds or longer.

This pinpoint test is intended to diagnose the following:


- Module communication
- DDM
- SJB

PINPOINT TEST AB: DTC U0140

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AB1 VERIFY CUSTOMER CONCERN


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

Yes
GO to AB2.

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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AB2 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 AB3.

No
REFER to Module Communications Network Testing and Inspection.

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AB3 RETRIEVE THE RECORDED DTCs FROM THE SELF-TEST


- Check for recorded DDM DTCs from the self-test.
- Is DTC B1317 or DTC B1318 recorded?

Yes
For DTC B1317, GO to Pinpoint Test Z. Pinpoint Test Z: DTC B1317

For DTC B1318, GO to Pinpoint Test AA. Pinpoint Test AA: DTC B1318

No
GO to AB4.

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AB4 RECHECK THE DDM 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 DDM self-test.
- Is DTC U0140 still present?

Yes
GO to AB5.

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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AB5 CHECK FOR DTC U0140 IN OTHER MODULES


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

- 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 U0140:00/U0140 set in other modules?

Yes
INSTALL a new SJB. REFER to Multifunction Electronic Modules Smart Junction Box (SJB). TEST the system for normal operation.

No
INSTALL a new DDM. REFER to Driver Door Module (DDM) Service and Repair. TEST the system for normal operation.

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