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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 179 (POWER SUN ROOF)REPAIR INSTRUCTIONSSUNROOF WIRING HARNESS REPLACEMENTINSTALLATION PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic
Installation Procedure
1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Align the wire harness to the sunroof module.
- Connect the electrical connectors to the Position Encoding System Module.
- Connect the electrical connector to the body harness.
- Connect the electrical connector to the express module.
- Install new nylon tie straps to the express module and the drive cable tube.
- Install new tape to hold the wire harness to the module.
- Connect the electrical connector to the control switch.
- Cycle the sunroof for correct operation.
- Install the rear shelf. Refer to TRIM PANEL REPLACEMENT - REAR WINDOW SHELF .
- Install the headliner. Refer to HEADLINER REPLACEMENT .
RENDER: 1.0x
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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.