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Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Acadia, 2011 Chevrolet Traverse, and 2011 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Ignition ON, test for 11.8-12.2 V between the 12 V reference circuit terminal 15 and ground.
    • If greater than the specified range, test the 12 V reference circuit for short to voltage. If the circuit tests normal, replace the BCM.
    • If less than the specified range, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. If all circuits test normal, replace the headlamp switch.
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