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Circuit/System Testing

WARNING: This page is about a different car, the 2012 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Each courtesy lamp component controlled by the courtesy lamp control circuit terminal 2 X7 may need to be disconnected to isolate a short to voltage or a short to ground. Use the schematic to identify the following:

  • Each component's control and ground circuit terminals
  • Courtesy lamp components the vehicle is equipped with
  • Component locations on the courtesy lamp control circuit
  1. Ignition OFF, disconnect the harness connector at any component with inoperative courtesy lamps controlled by the courtesy lamp control circuit terminal 2 X7.
  2. Connect a test lamp between the appropriate control circuit terminal and ground.
  3. Ignition ON, command the Inadvertent Load ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K9 BCM.
  4. If all circuits test normal, replace the inoperative courtesy lamp.
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