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 1586 (KEYLESS ENTRY SYSTEM)DESCRIPTION AND OPERATIONKEYLESS ENTRY SYSTEM DESCRIPTION AND OPERATIONLOCK ALL DOORS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Lock All Doors
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Lock All Doors
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Pressing the lock button will:
- Lock all of the doors.
- Turn the interior lamps on for 2 seconds.
- Turn the puddle lamps on (if equipped) for 2 seconds.
- Arm the content theft deterrent (CTD) system (if equipped).
Press the LOCK button again within 3 seconds of the first press in order to perform the following functions:
- Chirp the horn.
- Turn the interior lamps on for 2 seconds.
- Turn the puddle lamps on (if equipped) for 2 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.