Pinpoint Test BA: DTC U0140

Seats

Pinpoint Tests

Pinpoint Test BA: DTC U0140

Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 123, Memory Seats for schematic and connector information. Diagrams By Number

Normal Operation

The Driver Seat Module (DSM) 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 DSM whenever it has lost communication to the SJB for 15 seconds or longer as long as the module voltage is between 10 and 15 volts.

This pinpoint test is intended to diagnose the following:


- Module communication
- DSM
- SJB

PINPOINT TEST BA: DTC U0140

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BA1 VERIFY CUSTOMER CONCERN


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

Yes
GO to BA2.

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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BA2 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 BA3.

No
REFER to Module Communications Network Testing and Inspection.

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BA3 RETRIEVE THE RECORDED DTCs FROM THE SELF-TEST


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

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

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

No
GO to BA4.

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BA4 RECHECK THE DSM 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 DSM self-test.
- Is DTC U0140 still present?

Yes
GO to BA5.

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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BA5 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 any other module?

Yes
INSTALL a new SJB. REFER to Seating Service and Repair.

No
INSTALL a new DSM. REFER to Driver Seat Module (DSM) Service and Repair.

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