Pinpoint Test AU: DTC U0140

Seats

Pinpoint Test AU: DTC U0140

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 (Medium Speed Controller Area Network) for the purposes of determining what functions are being carried out.

- DTC U0140 (Lost Communication With Body Control Module (GEM)- set by the Driver Seat Module (DSM) 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

- DSM (Driver Seat Module)

- SJB (Smart Junction Box)

PINPOINT TEST AU : DTC U0140

AU1 VERIFY CUSTOMER CONCERN

- Ignition ON.

- Verify that there is an observable symptom present.

Is an observable symptom present?

Yes
GO to AU2.

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.

AU2 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 AU3.

No
REFER to Information Bus.

AU3 RETRIEVE THE RECORDED DTCs FROM THE SELF-TEST

- Check for recorded DSM (Driver Seat Module) DTCs from the self-test.

Is DTC B1317 or DTC B1318 recorded?

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

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

No
GO to AU4.

AU4 RECHECK THE DSM (Driver Seat Module) 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 (Programmable Module Installation) may not have been carried out.

- Clear the DTCs. Repeat the DSM (Driver Seat Module) self-test.

Is DTC U0140 still present?

Yes
GO to AU5.

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.

AU5 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 (Programmable Module Installation) or the PMI (Programmable Module Installation) 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 (Smart Junction Box). TEST the system for normal operation.

No
INSTALL a new DSM (Driver Seat Module). REFER to Driver Seat Module (DSM) . TEST the system for normal operation.