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 1848 (FIXED & MOVEABLE WINDOW SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW DEFOGGER MALFUNCTIONCIRCUIT/SYSTEM TESTINGSINGLE REAR WINDOW DEFOG GRID MALFUNCTION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Single Rear Window Defog Grid Malfunction
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Single Rear Window Defog Grid Malfunction
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the appropriate rear window defogger grid.
- Test for less than 1 ohm between the ground circuit terminal listed below and ground.
- RPO A12 rear window defogger grid ground terminal A
- RPO A18 rear window defogger grid ground terminal B
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, connect a test light between the control circuit terminal A and ground.
- Command the rear window defogger ON and OFF by pressing and depressing the rear window defog switch. The test lamp should turn ON and OFF when changing between the command states.
- If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the rear window defogger grid.
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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.