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 924 (BODY CONTROL SYSTEM)REPAIR INSTRUCTIONSBODY CONTROL MODULE REPLACEMENTINSTALLATION PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Installation Procedure
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
- Install the body control module to the bracket at an angle under the wide hook retainer, with the label facing away from the bracket.
- Apply pressure on the left side of the body control module in order to move the module toward the mounting bracket base. Snap the module into place.
- Ensure that the module is fully seated. Ensure that both snap retainers are holding the module.
- Connect the electrical connectors to the body control module. Be sure to connect the brown connector last.
- Install the lower instrument panel sound insulator to the vehicle. Refer to CLOSEOUT/INSULATOR PANEL REPLACEMENT -- INSTRUMENT PANEL (I/P) LOWER in Instrument Panel, Gages and Console.
- Install the left instrument panel sound insulator to the vehicle. Refer to CLOSEOUT/INSULATOR PANEL REPLACEMENT -- LEFT in Instrument Panel, Gages and Console.
- Use the following components in order to program the body control module with the proper calibrations:
- The Techline Terminal
- The scan tool
- Perform the BCM Programming. Refer to BODY CONTROL MODULE (BCM) PROGRAMMING/RPO CONFIGURATION .
- Clear the diagnostic trouble codes (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.