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.
2003 Chevrolet Express 1/2 Ton Van V6-4.3L VIN XFACTORY OEM SERVICE PROCEDURE
Body Control Module: Service and Repair
BODY CONTROL MODULE REPLACEMENT
REMOVAL PROCEDURE
1. Remove the right side knee bolster trim panel.
2. Disconnect the electrical connectors (2) from the Body Control Module (BCM) (1).
3. Release the tabs (2) retaining the BCM (1) to the bracket.
4. Remove the BCM (1) from the vehicle.
INSTALLATION PROCEDURE
1. Install the BCM (1) into the bracket.
Ensure the BCM (1) is engaged in the bracket, under the retaining tabs (2).
2. Connect the electrical connectors (2) to the BCM (1).
3. Install the right side knee bolster trim panel.
4. If the BCM has been replaced the module will need to be programed.
Program the BCM. Programming and Relearning
REMOVAL PROCEDURE
1. Remove the right side knee bolster trim panel.
2. Disconnect the electrical connectors (2) from the Body Control Module (BCM) (1).
3. Release the tabs (2) retaining the BCM (1) to the bracket.
4. Remove the BCM (1) from the vehicle.
INSTALLATION PROCEDURE
1. Install the BCM (1) into the bracket.
Ensure the BCM (1) is engaged in the bracket, under the retaining tabs (2).
2. Connect the electrical connectors (2) to the BCM (1).
3. Install the right side knee bolster trim panel.
4. If the BCM has been replaced the module will need to be programed.
Program the BCM. Programming and Relearning
Factory Service Tools
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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.
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