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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1224 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESHEADLAMPS MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Verification
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Verification
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, expose the ambient light sensor to a bright incandescent lamp.
- Wait 20 seconds.
- Verify the scan tool Day/Night Status parameter is Day.
- If not the specified value, refer to DRL Inoperative.
- Place the headlamp switch in the AUTO position.
- Cover the ambient light sensor.
- Wait 20 seconds.
- Verify the scan tool Day/Night Status parameter is Night.
- If not the specified value, refer to ALC Inoperative.
- Command the low beam headlamps ON and OFF with a scan tool. The low beam headlamps should turn ON and OFF when changing between the commanded states.
- If both low beam headlamps are inoperative, refer to Low Beam Headlamps Inoperative.
- If only one low beam headlamp is inoperative, refer to Headlamp Inoperative - One.
- Command the high beam headlamps ON and OFF with a scan tool. The high beam headlamps should turn ON and OFF when changing between the commanded states.
- If both high beam headlamps are inoperative, refer to Low Beam Headlamps Inoperative.
- If only one high beam headlamp is inoperative, refer to Headlamp Inoperative - One.
- Place the headlamp switch in the HEAD position.
- Place the headlamp dimmer switch in the HI position. The high beam indicator should illuminate.
- If the high beam indicator does not illuminate, refer to High Beam Indicator Inoperative.
- Refer to Headlamp Switch Malfunction
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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.