Inspection and Verification

Visually inspect the following for obvious signs of electrical damage.

VISUAL INSPECTION CHART

Electrical
Wiring, terminals or connectors Key-in-ignition warning switch Instrument cluster

If an obvious cause for an observed concern is found, correct the cause (if possible) before proceeding to the next step.
NOTE:
- Make sure to use the latest scan tool software release.
If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
NOTE:
- The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM,
If the scan tool does not communicate with the VCM:
- Check the VCM connection to the vehicle.
- Check the scan tool connection to the VCM.
- See PINPOINT TEST 8: NO MODULE/NETWORK COMMUNICATION - NO POWER TO THE DIAGNOSTIC TOOL to diagnose no communication with the scan tool.
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.
- See COMMUNICATIONS NETWORK to diagnose no response from the powertrain control module (PCM).
Carry out the network test
- If the scan tool responds with no communication for one or more modules, See COMMUNICATIONS NETWORK .
- If the network test passes, retrieve and record continuous memory diagnostic trouble codes (DTCs).
Clear the continuous DTCs and carry out the self-test diagnostics for the instrument cluster.
If the DTCs retrieved are related to the concern, see INSTRUMENT CLUSTER DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
If no DTCs related to the concern are retrieved, see SYMPTOM TROUBLESHOOTING CHART - WARNING DEVICES .