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.
- Ignition OFF, disconnect the HID/LO BEAM relay.
- 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.
- If all circuits test normal, test or replace the BCM.