No DTC'S stored any modules ? Any parasitic drain on the battery ? Does scan tool communicate with the instrument cluster ? Do you know about GM power modes
- Access the Class 2 Power Mode in the Diagnostic Circuit Check on the scan tool.
- Rotate the ignition switch through all positions while observing the Ignition Switch Power Mode parameter.
Does the Ignition Switch parameter reading match the ignition switch position for all switch positions?
What type scan tool are you using ? Can yours communicate with all the modules on the vehicle ?
Select the display DTCs function on the scan tool for the following control modules:
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Transfer Case Electronic Control (TREC)
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Body Control Module (BCM)
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Electronic Brake Control Module (EBCM)
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Instrument Panel Cluster (IPC)
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Powertrain Control Module (PCM)
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Sensing and Diagnostic Module (SDM)
Does the scan tool display any DTCs for the control modules listed above?
Does the scan tool display any DTCs which begin with a "U"?