Pinpoint Test L: DTC U0140

Driver Seat Module (DSM)

Pinpoint Tests

Pinpoint Test L: DTC U0140

Refer to Wiring Diagram Set 14, Module Communications Network 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.

- 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 L: DTC U0140

-------------------------------------------------
L1 VERIFY CUSTOMER CONCERN


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

Yes
GO to L2.

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

-------------------------------------------------
L2 CHECK THE COMMUNICATION NETWORK


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the DSM pass the network test?

Yes
GO to L3.

No
REFER to Information Bus.

-------------------------------------------------
L3 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 J. Pinpoint Test J: DTC B1317

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

No
GO to L4.

-------------------------------------------------
L4 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 L5.

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

-------------------------------------------------
L5 CHECK FOR DTC U0140/U0140:00 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/U0140:00 set in other modules?

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

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

-------------------------------------------------