Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1213 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDAYTIME RUNNING LAMPS MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Circuit/System Verification
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION 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.
- 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.
- Connect a test lamp between the relay side of the DRL fuse and ground.
- 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.
- 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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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.