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.
Setup New Body Control Module (BCM)
2002 Chevrolet Avalanche 2500, RWDSECTION Setup New Body Control Module (BCM)
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
- The BCM will not function properly if the Setup New BCM procedure is not performed.
- Make sure the battery is fully charged before performing the setup procedure.
- Make sure all disconnected devices and connectors have been reconnected
- Make sure that the VIN that is stored in the new BCM matches the vehicle.
- If the scan tool displays UNABLE TO PROGRAM BCM. BCM IS SECURED, then the BCM must be replaced and this procedure must be repeated on a new BCM
- Turn the ignition switch ON leaving the engine Off.
- Using the Special Functions in the Body Control Module menu on the Scan Tool, perform the following setup procedures in the order they are listed:
- Setup SDM Part Number in BCM
- New VIN
- Option Configuration
- Point of Sale
- After all of the previous procedures are complete proceed with the Theft Deterrent Re-learn procedure. Refer to Programming Theft Deterrent System Components in Theft Deterrent.
- If the scan tool displays UNABLE TO PROGRAM BCM. BCM IS SECURED, then the BCM must be replaced and this procedure must be repeated on a new BCM.
NOTE: After the above procedure has been completed, personalization of the BCM defaults to the factory settings. Inform the customer that the personalization settings must be set again.
IMPORTANT:
After programming, perform the following to avoid future misdiagnosis:
- Turn the ignition OFF for 10 seconds.
- Connect the scan tool to the data link connector.
- Turn the ignition ON with the engine OFF.
- Use the scan tool in order to retrieve history DTCs from all modules.
- Clear all history DTCs.
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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.