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 MANUALSGMC2004ENVOY XL 5.3 P, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 3 (BODY CONTROL SYSTEM)REPAIR INSTRUCTIONSBODY CONTROL MODULE REPLACEMENTINSTALLATION PROCEDURE
2004 GMC Envoy XL 5.3 P, 4WD
Installation Procedure
2004 GMC Envoy XL 5.3 P, 4WDSECTION Installation Procedure
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Slide the BCM onto the bracket.
- Connect all the connectors (1) except the brown connector.
- Connect the brown connector.
- Install the knee bolster. Refer to Knee Bolster Replacement in Instrument Panel, Gages, and Console.
- Connect the negative battery cable(s).
- Reprogram the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration .
- Perform the Passlock Learn Procedure. Refer to Programming Theft Deterrent System Components in Theft Deterrent
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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.