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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 Circuit Test

DRL 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. Turn the ignition ON and the headlamps OFF.
  2. With a test lamp connected to ground, probe each of the test points on the DRL 2 fuse while commanding the DRL ON and OFF with a scan tool. The test lamp should turn ON and OFF between commanded states at one or both of the fuse test points.
    • If the test lamp is always ON, test the supply voltage circuit between the DRL 1 fuse and the DRL 2 fuse for a short to voltage. If the circuit tests normal, replace the underhood fuse block.
    • If the test lamp is always OFF, test the supply voltage circuit between the DRL 1 fuse and the DRL 2 fuse for a short to ground or an open/high resistance. If the circuit tests normal, replace the underhood fuse block.
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