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 119 (SUNROOF SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESPOWER SUNROOF MALFUNCTIONCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
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 OFF, disconnect the harness connector at the sunroof switch.
- Test for less than 5 ohms between the low reference circuit terminal B and ground.
- If greater than the specified range, test the following ground circuits for an open/high resistance. If the circuits test normal, replace the sunroof motor/actuator.
- Sunroof switch low reference circuit terminal B
- Sunroof motor/actuator harness connector ground circuit terminal 1
- If greater than the specified range, test the following ground circuits for an open/high resistance. If the circuits test normal, replace the sunroof motor/actuator.
- Connect a 3A fused jumper wire between the following sunroof switch signal circuits and ground. The roof should be inoperative in at least one or more directions.
- Terminal C sunroof switch open signal
- Terminal A sunroof switch close signal
- If the roof moved in all directions, replace the sunroof switch.
- Ignition OFF, disconnect the harness connector at the sunroof control module.
- Test for less than 5 ohms between the ground circuit terminal 1 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.
- If the test lamp does not illuminate, repair the B+ circuit for a short to ground or an open/high resistance.
- Verify that a test lamp illuminates between the ignition voltage circuit terminal 3 and ground.
- If the test lamp does not illuminate, repair the ignition voltage circuit for a short to ground or an open/high resistance.
- Ignition OFF, connect the harness connector at the sunroof control module.
- Ignition ON, test for B+ between the following sunroof switch signal circuits and ground.
- Sunroof switch open signal terminal C.
- Sunroof switch close signal terminal A.
- If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the sunroof control module.
- If all circuit test normal, replace the sunroof control module.
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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.