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Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Outlook, 2009 GMC Acadia, 2009 Chevrolet Traverse, and 2009 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X4 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. If the circuit tests normal and the B+ circuit fuse is open, test the control circuits listed below for a short to ground.
      • Courtesy lamp control terminal 1 X6
      • Courtesy lamp control terminal 5 X2
  3. Ignition OFF, connect the X4 harness connector at the BCM.
  4. Disconnect the harness connectors at all components fed by the control circuits listed below.
    • Courtesy lamp control terminal 1 X6
    • Courtesy lamp control terminal 5 X2
  5. Ignition ON, clear the DTC with a scan tool.
  6. Operate the vehicle 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.
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