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Circuit/System Testing

WARNING: This page is about a different car, the 2012 Chevrolet Captiva Sport. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the DRL relay.
  2. Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.
  3. Command the DRL ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, test or replace the DRL relay.
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