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 1012 (FIXED & MOVEABLE WINDOW SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW RELEASE 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 does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Liftglass Release Switch Circuit Test
- Disconnect the BCM connector C6.
- Connect a test lamp from battery voltage to the liftglass release switch circuit terminal in the harness connector.
- Verify the test lamp is not illuminated while the release switch is inactive.
- If the test lamp remains illuminated the signal circuit is shorted to ground or the switch contacts are shorted closed.
- Verify the test lamp is illuminated while the release switch is active.
- If the test lamp does not illuminate an open is present in the signal circuit, switch or ground.
- If the release switch circuits test normal replace the BCM.
Liftglass Release Output Circuit Test
- Disconnect the rear wiper motor connector.
- Ignition ON, verify that battery voltage is present on the liftglass latch release signal circuit while the liftglass release switch is activated.
- If battery voltage is not present, test the liftglass latch release signal circuit for an open or high resistance. If the circuit tests normal replace the BCM.
- Connect the rear wiper motor connector.
- Disconnect the liftglass latch actuator connector. Connect a test lamp from the latch actuator control circuit terminal to the ground circuit terminal in the harness connector.
- Verify that the test lamp illuminates when the liftglass release switch is activated.
- If the test lamp does not illuminate test the control and ground circuits for an open or short to ground. If the circuits test normal replace the rear wiper motor module.
- If the liftglass release output circuits test normal replace the liftglass latch release actuator.
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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.