Inspection and Verification

Visually inspect for obvious signs of mechanical or electrical damage.

VISUAL INSPECTION

Mechanical	Electrical
Window regulator assembly Window glass Rear window defrost grid	Smart Junction Box (SJB) circuit breaker 47 (30A) Battery Junction Box (BJB) fuse(s): 2 (30A) 35 (10A) Rear window defrost relay Accessory delay relay Window motor Window control switch Circuitry

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 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 .
- refer to MODULE COMMUNICATIONS NETWORK article No Power To The Scan Tool, to diagnose no power to 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 article to diagnose no response from the SJB or HVAC module.
Carry out the network test.
- If the scan tool responds with no communication from one or more modules, refer to MODULE COMMUNICATIONS NETWORK article.
- If the network test passes, retrieve and record the Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Clear the continuous DTCs and carry out the self-test diagnostics for the SJB or HVAC module.
If the DTCs retrieved are related to the concern, go to the SMART JUNCTION BOX (SJB) DTC CHART or HVAC MODULE DTC CHART . For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULE article.
If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART .