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Rear Compartment Courtesy Lamp Malfunction

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the rear compartment courtesy lamp.
  2. Ignition OFF, trunk OPEN, verify that a test lamp illuminates between B+ and the control circuit terminal A.
    • If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance.
  3. Ignition OFF, trunk OPEN, verify that a test lamp illuminates between the control circuit terminal B and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the rear compartment courtesy lamp.
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