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 1250 (PERSONALIZATION SYSTEMS)DESCRIPTION AND OPERATIONVEHICLE PERSONALIZATIONPROGRAMMING FEATURESENTER PROGRAMMING MODE
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Enter Programming Mode
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Enter Programming Mode
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
Perform the following steps in order to enter the programming mode:
- The optional content theft deterrent system must be disarmed.
- With the ignition in the OFF position, remove the BCM PRGRM fuse, close the driver door.
- Turn the ignition to the ACC position.
- Listen to the number of chimes. The chimes indicate the BCM type (2, 3, or 4) and therefore the features that may be personalized.
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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.