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 1105 (FIXED & MOVEABLE WINDOW SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW DEFOGGER INOPERATIVECIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Circuit/System Testing
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, verify that the rear defogger indicator illuminates when the switch is activated.
- If the indicator does not illuminate when system operation is attempted, replace the HVAC control module.
- Connect a test lamp from the supply side of the REAR DEFOG fuse to ground.
- Verify that the test lamp is illuminated while the rear defogger is turned on.
- If the test lamp does not illuminate test the battery supply circuit to the REAR DEFOG relay for an open/high resistance or short to ground. If the circuit tests normal replace the REAR DEFOG relay.
- Disconnect the rear defogger grid connectors and verify that a test lamp illuminates when connected from battery voltage to the ground circuit connector.
- If the test lamp does not illuminate repair the ground circuit for an open/high resistance.
- Connect a test lamp across the rear defogger grid connectors and verify that the test lamp illuminates when the defogger is turned on.
- If the test lamp does not illuminate repair the defogger grid supply circuit for an open/high resistance.
- If the circuits test normal 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.