Inspection and Verification

Visually inspect for obvious signs of electrical damage.

VISUAL INSPECTION CHART

Electrical
Smart junction box (SJB) fuse 10 (15A) Wiring, terminals or connectors Illuminated components SJB

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.

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.
- Refer to MODULE COMMUNICATIONS NETWORK , No Power To The Scan 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.
- Refer to MODULE COMMUNICATIONS NETWORK to diagnose no response from the PCM.
Carry out the network test.
- If the scan tool responds with no communication with the SJB, refer to MODULE COMMUNICATIONS NETWORK .
- If the network test passes, retrieve and record the continuous memory DTCs.
Clear the continuous DTCs and carry out the self-test diagnostics for the SJB.
If the DTCs retrieved are related to the concern, go to Diagnostic Trouble Code (DTC) Charts. For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES .
If no DTCs related to the concern are retrieved, go to Symptom Chart .