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Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the appropriate harness connector at each component fed by the inadvertent power courtesy lamp control circuit.
  2. Ignition ON, verify that a test lamp illuminates between the courtesy lamp control circuit at each component harness connector and ground.
    • If the test lamp does not illuminate, test the inadvertent power courtesy lamp control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the BCM.
  3. Connect each component one at a time and verify with a scan tool if the DTC resets as current.
    • If the DTC resets, test or replace the inoperative component.
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