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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 appropriate DRL relay.
  2. Verify that a test lamp does not illuminate between the relay control circuit terminal 85 and ground.
    • If the test lamp illuminates, test the relay control circuit for a short to voltage.
  3. If all circuits test normal, test or replace the BCM.
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