Initial Inspection and Diagnostic Overview
Inspection and Verification1. Verify the customer concern by operating the ignition switch.
2. Visually inspect for obvious signs of mechanical and electrical damage.
NOTE: For multifunction switch concerns, refer to one of the following sections:
- Exterior Lighting.
- Wipers and Washers.
3. If the concern remains after the inspection, connect the diagnostic tool to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch position.
4. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool manual.
5. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
- SCP or UBP circuit fault; all electronic control units no response/not equipped, refer to Module Communications Network.
- No response/not equipped for the instrument cluster, go to Instrument Panel, Gages and Warning Indicators.
- System passed, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the instrument cluster.
6. If the DTCs retrieved are related to the concern, go to the Instrument Cluster Diagnostic Trouble Code (DTC) Index to continue diagnostics. [1][2]Diagnostic Trouble Code Descriptions
7. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.
Symptom Related Diagnostic Procedures