Diagnostic Routine AN

Diagnostic Routine AN

Diagnostic Overview

U0140

Refer to Wiring Diagram Set 123 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

DTC Fault Trigger Conditions






Pinpoint Test

1. VERIFY CUSTOMER CONCERN

1. Ignition ON.

2. Verify that there is an observable symptom present.

Is an observable symptom present?








2. CHECK THE COMMUNICATION NETWORK

1. Using a scan tool, perform the network test.

Does the BCM (Body Control Module) pass the network test?








3. CHECK FOR DTCs (Diagnostic Trouble Codes) U3003:16 AND U3003:17 FROM THE BCM (Body Control Module) SELF-TEST

1. Using a scan tool, retrieve the continuous memory DTCs (Diagnostic Trouble Codes) from the BCM (Body Control Module).

Is DTC (Diagnostic Trouble Code) U3003:16 or DTC (Diagnostic Trouble Code) U3003:17 recorded?








4. RECHECK THE DSM (Driver Seat Module) DTCs (Diagnostic Trouble Codes)

1. NOTE: If new modules were installed prior to the DTC (Diagnostic Trouble Code) 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.
Using a scan tool, clear the DTCs (Diagnostic Trouble Codes). Repeat the DSM (Driver Seat Module) self-test.

Is DTC (Diagnostic Trouble Code) U0140 still present?








5. CHECK FOR DTC (Diagnostic Trouble Code) U0140:87 OR DTC (Diagnostic Trouble Code) U0140 IN OTHER MODULES

1. Using a scan tool, clear all DTCs (Diagnostic Trouble Codes).

2. Ignition OFF.

3. Ignition ON.

4. Wait 10 seconds.

5. Using a scan tool, retrieve the continuous memory DTCs (Diagnostic Trouble Codes) from all modules.

Is DTC (Diagnostic Trouble Code) U0140:87 or DTC (Diagnostic Trouble Code) U0140 set in any other modules?