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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Saturn Outlook, 2008 GMC Acadia, and 2008 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the HID/LO BEAM relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the relay coil control circuit terminal 86 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  3. If all circuits test normal, test or replace the BCM.
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