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 G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 403 (LIGHTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESFRONT FOG LAMPS MALFUNCTIONCIRCUIT/SYSTEM TESTINGFRONT FOG LAMP SWITCH MALFUNCTION
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Front Fog Lamp Switch Malfunction
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Front Fog Lamp Switch Malfunction
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the turn signal/multifunction switch.
- Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 3.
- If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
- Ignition ON, verify that a test lamp does not illuminate between B+ and the signal circuit terminal 4.
- If the test lamp illuminates, test the signal circuit for a short to ground. If the circuit tests normal, replace the IPM.
- Install a 3-A fused jumper wire between the signal circuit terminal 4 and the ground circuit terminal 3. Verify the front fog lamps are illuminated.
- If the front fog lamps do not illuminate, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPM.
- If all circuits test normal, test or replace the turn signal/multifunction switch.
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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.