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 PROCEDURESHEADLAMPS 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 Headlamp Switch parameter while cycling the headlamp switch between the auto and headlamp position. The parameter should cycle between Active and Inactive.
- If the parameter does not cycle between the specified values, refer to the Headlamp Switch Circuit Test below.
- Observe the headlamps while cycling the headlamp switch between the auto and headlamp position. The low beam headlamps should turn on and off.
- If 1 or both of the low beam headlamps do not turn on and off, refer to the Low Beam Headlamp Circuit Test below.
- Low beam headlamps ON, observe the scan tool High Beam Select Switch parameter while switching the high/low beam select switch between the low and high beam positions. The parameter should cycle between Active and Inactive.
- If the parameter does not cycle between the specified values, refer to the High/Low Beam Select Switch Circuit Test below.
- Connect a test lamp between the relay side of a high beam headlamp fuse and ground.
- Verify that the test lamp turns on and off while switching the high/low beam select switch between the low and high beam positions.
- If the test lamp does not turn on and off while changing between the commanded states, refer to the High Beam Relay Control Circuit Test below
- If 1 or both of the high beam headlamps do not turn on and off, refer to the High Beam Headlamp 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.