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 29 (COMPUTER RELEARN PROCEDURES)RELEARN PROCEDURES (TRUCKS & VANS)MONTANA, SILHOUETTE & VENTUREPASS-KEY(R) III SYSTEM QUICK LEARN PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD
PASS-Key(R) III System Quick Learn Procedure
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION PASS-Key(R) III System Quick Learn Procedure
WARNING: This page does not describe the selected car, but rather 67 other vehicles, including the 2000 Saturn SW2, 2000 Saturn SL2, 2000 Saturn SL1, 2000 Saturn SL, and 2000 Saturn SC2. However, it is still accessible from the selected car via links, so may be relevant.
- Insert a valid ignition key in the ignition switch. Turn ignition on. After 2 second bulb test, turn ignition off and remove key.
- Within 10 seconds, insert new valid mechanical code unlearned key and turn ignition switch to RUN position. Security light will illuminate until key is learned. This may happen so quickly light illumination is not observed. Turn ignition off. Remove ignition key 10 seconds after light goes out.
- To learn additional keys, repeat step 2). To exit procedure, turn ignition off for more than 10 seconds.
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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.