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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 983 (Lighting Systems) >> Diagnostic Information and Procedures >> Daytime Running Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool Ambient Light Sensor parameter voltage while carefully supplying sufficient light to simulate daylight conditions to the ambient light sensor, then covering to simulate darkness. The voltage reading should change from approximately 0.69 to 4.52 volts.
    • If the reading does not change between light and dark, refer to the Ambient Light Sensor Circuit Test below.
  2. Connect a test lamp between the relay side of the DRL fuse and ground.
  3. Verify that the test lamp turns on and off while commanding the daytime running lamps ON and OFF with a scan tool.
    • If the test lamp does not turn on and off while changing between the commanded states, refer to the DRL Relay Control Circuit Test below.
  4. If 1 or both of the daytime running lamps do not turn on and off, refer to the Daytime Running Lamps Circuit Test below.
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