Inspection and Verification

INSPECTION AND VERIFICATION

1. Verify the customer concern.
2. Visually inspect the following for obvious signs of electrical damage.

VISUAL INSPECTION CHART

Electrical
- Circuitry
- Key-in-ignition warning switch (part of the ignition switch)
- Instrument cluster

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).

5. NOTE: The vehicle communication module (VCM) LED prove-out confirms voltage and ground from the DLC are provided to the VCM.

If the scan tool does not communicate with the VCM:
- Check the connection to the vehicle.
- Refer to Information Bus (Module Communications Network) to diagnose no communication with the scan tool.

6. If the scan tool does not communicate with the vehicle:
- Verify the ignition key is in the ON position.
- Verify the scan tool operation with a known good vehicle.
- Refer to Information Bus (Module Communications Network) to diagnose no response from the powertrain control module (PCM).

7. Carry out the network test:
- If the scan tool responds with no communication for multiple modules, refer to Information Bus (Module Communications Network).
- If the scan tool responds with no communication with the instrument cluster, Instrument Panel, Gauges Warning and Indicators.
- If the network test passes, retrieve and record the continuous memory DTCs.

8. Clear the continuous DTCs and carry out the self-test diagnostics for the instrument cluster.
9. If the DTCs retrieved are related to the concern, go to the Instrument Cluster Diagnostic Trouble Code (DTC) Chart. For all other DTCs, refer to Body Control Systems (Multifunction Electronic Control Module). Warning Devices
10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Warning Devices