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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 275 (BODY CONTROL SYSTEM)REPAIR INSTRUCTIONSBODY CONTROL MODULE (BCM) PROGRAMMING/RPO CONFIGURATIONSETUP NEW BODY CONTROL MODULE (BCM)
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Setup New Body Control Module (BCM)
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Setup New Body Control Module (BCM)
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.
NOTE:
After the procedure is completed, personalization of the BCM defaults to a default setting. Inform the customer that the personalization must be set again.
The following procedure will set up the new BCM:
- Connect a Tech 2 to the Data Link Connector (DLC).
- Turn the ignition switch ON.
- Select "Diagnostics" and input all of the required data to select the correct vehicle when prompted by the Tech 2.
- Select "Body" and then "Body Control Module".
- Select "Special Functions".
- Select "New VIN" and follow the screen directions to input all required data.
- Exit back to the "Special Functions" menu.
- Select "BCM Reprogramming".
- The scan tool will display "Do you want to setup a Body Control Module?" At the prompt, select "Setup BCM" soft-key on the scan tool.
- The scan tool will display "Now setting up the new Body Control Module".
- When the BCM has been setup successfully, the scan tool will display "Body Control Module setup is complete".
- When the BCM Setup Procedure and VIN have been entered, proceed with the procedure PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS .
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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.