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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac XLR. 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 courtesy lamp supply voltage circuit.
  2. Ignition ON, verify that a test lamp illuminates between the courtesy lamp supply voltage circuit at each component harness connector and ground.
    • If the test lamp does not illuminate, test the courtesy lamp supply voltage 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.
  4. If the DTC resets, test or replace the inoperative component.
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