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Home >> Chevrolet >> 2007 >> Impala SS >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Lighting Systems) >> Diagnostic Information and Procedures >> Daytime Running Lamps Malfunction >> Circuit/System Testing >> DRL Relay Circuit Test

DRL Relay Circuit Test

WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the (C4) harness connector at the underhood fuse block.
  2. Connect a test lamp between the DRL PCB relay control circuit terminal H2 and B+.
  3. Ignition ON and headlamps OFF, command the DRL ON and OFF with a scan tool. The test lamp should turn ON and OFF between 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 nest normal, replace underhood fuse block.
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