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 5 (COMPUTER RELEARN PROCEDURES)GENERAL MOTORS (CARS)ALERO, GRAND AM & MALIBUPASSWORD LEARN PROCEDURE FOR ANTI-THEFT SYSTEM
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Password Learn Procedure For Anti-Theft System
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Password Learn Procedure For Anti-Theft System
WARNING: This page does not describe the selected car, but rather 98 other vehicles, including the 2001 Saturn SW2, 2001 Saturn SL2, 2001 Saturn SL1, 2001 Saturn SL, and 2001 Saturn SC2. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If Tech 2 scan tool and Techline terminal is available, a 10 minute procedure is available. Follow scan tool manufacturer's instructions.
- Turn ignition switch to ON position, engine off. Attempt to start engine, then release key to ON position (vehicle will not start). Observe SECURITY telltale, after approximately 10 minutes, telltale will turn off. Turn ignition switch to OFF position and wait 5 seconds.
- Repeat step 1 two more times for a total of 3 cycles/30 minutes. Vehicle is now ready to relearn Passlock™ Sensor Data Code and/or passwords on next ignition switch transition from off to crank.
- Start engine (vehicle has now learned Passlock™ Sensor Data Code and/or password). Using scan tool, clear DTCs.
NOTE:
Vehicle learns Passlock™ Sensor Data Code and/or password on next ignition switch transition from off to crank. You must turn ignition off before attempting to start vehicle.
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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.