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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 X2 harness connector at the BCM.
  2. Verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect the X2 harness connector at the BCM.
  4. Disconnect the harness connectors at all components fed by the BCM control circuit terminal 3 X2.
  5. Ignition ON, clear the DTC with a scan tool.
  6. Operate the system within the Conditions for Running the DTC and verify the DTC does not reset.
    • If the DTC resets, test the control circuits for a short to ground. If the circuits test normal, replace the BCM.
  7. Reconnect each component one at a time and verify that the DTC does not reset.
    • If the DTC resets, test or replace the component responsible for setting the DTC.
  8. If all circuits test normal, replace the BCM.
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