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 783 (SECURITY SYSTEM AND LOCKS SYSTEM)IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARINGNO. 2 ADDITIONAL KEY REGISTRATION PROCEDURE (USING THE WDS OR EQUIVALENT)PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD
No. 2 Additional Key Registration Procedure (Using The WDS Or Equivalent): Procedure
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Procedure
WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
- Have one key (key 1) ready for registration.
- Using key 1, turn the ignition switch to the ON position.NOTE:
- Although the security light flashes and DTC 15 is displayed, this does not indicate an improper procedure. Continue to perform the procedure as indicated.
- Connect the WDS or equivalent to the DLC-2.
- Select "Body/Security/PATS function" from the WDS or equivalent screen menu.
- Perform security access as indicated on the WDS or equivalent screen. (See NO.6 SECURITY ACCESS PROCEDURE .)
- Select "Program Additional Ignition Key" from the WDS or equivalent screen menu.
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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.