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 MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 146 (ENGINE IMMOBILIZER SYSTEMS)PROGRAMMINGREGISTRATION OF ADDITIONAL SUB-KEYUSING TOYOTA HAND-HELD TESTER
2004 Toyota Celica GT, Standard
Using Toyota Hand-Held Tester
2004 Toyota Celica GT, StandardSECTION Using Toyota Hand-Held Tester
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
- Connect hand-held tester to data link connector No. 3. See Figure. When using hand-held tester, more detailed procedures may be displayed on tester while performing this procedure.
- Insert registered master key in ignition lock cylinder. Turn ignition on. Select SUB-KEY REGISTRATION on hand-held tester. Within 20 seconds, remove master key from ignition lock cylinder.
- Within 10 seconds of removing master key from ignition lock cylinder, insert sub-key to be registered in ignition lock cylinder. Ensure SECURITY indicator light flashes. SECURITY indicator light is located just above the fuel gauge on the instrument cluster.
- After one minute, additional sub-key should be registered and SECURITY indicator light should then turn off. The registration mode is complete after removing sub-key from ignition lock cylinder within 10 seconds and brake pedal is depressed, or SECURITY indicator light has turned off for at least 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.