Inspection and Verification

1. Verify the customer concern.
2. Visually inspect for obvious signs of electrical damage.
   VISUAL INSPECTION CHART
   
   

   Electrical
   Body Control Module (BCM) fuse(s): 12 (15A) 32 (15A) Wiring, terminals or connectors Illuminated components BCM

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
NOTE: Make sure to use the latest scan tool release software.
4. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
NOTE: The Vehicle Communication Module (VCM) prove-out confirms power and ground from the DLC are provided to the VCM.
5. 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.
   • REFER to MODULE COMMUNICATIONS NETWORK , No Power To The Scan Tool, to diagnose no power to 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 MODULE COMMUNICATIONS NETWORK , The PCM Does Not Respond To The Scan Tool, to diagnose no response from the PCM.
7. Carry out the network test.
   • If the scan tool responds with no communication with one or more modules, REFER to MODULE COMMUNICATIONS NETWORK .
   • 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 BCM.
9. If the DTCs retrieved are related to the concern, go to DTC Charts . For all other DTCs, refer to the Diagnostic Trouble Code (DTC) Chart in MULTIFUNCTION ELECTRONIC MODULES .

If no DTCs related to the concern are retrieved, GO to Symptom Chart .