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Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connectors at all components fed by the BCM LED backlight lamp control circuit terminal 18 X3.
  2. Ignition ON, with a scan tool, clear the DTC.
  3. Operate the vehicle within the conditions for running the DTC and verify the DTC does not reset.
    • If the DTC resets, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
  4. Reconnect each component one at a time and verify the DTC does not reset as current.
    • If the DTC resets as current, replace the component responsible for setting the DTC.
  5. If all circuits test normal, replace the BCM.
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