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 127 (ANTI-THEFT SYSTEMS)SYSTEM TESTSNOTES
2004 Toyota Celica GT, Standard
System Tests: Notes
2004 Toyota Celica GT, StandardSECTION Notes
WARNING: This page is about a different car, the 2003 Lexus ES 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
ANTI-THEFT SYMPTOM INDEX
| Symptom | Suspected Area | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Anti-Theft System Cannot Be Set | (1) Indicator Light Circuit, (2) ECU Power Source Circuit, (3) Key Unlock Warning Switch Circuit, (4) Luggage Compartment Door Key Lock & Unlock Switch Circuit & Engine Hood Courtesy Switch Circuit | ||||||||||
| Indicator Light Does Not Blink When System Is Set | (1) Indicator Light Circuit | ||||||||||
| When System Is Set (System Does Not Operate When Engine Hood Is Opened) | Engine Hood Courtesy Switch Circuit | ||||||||||
| When System Is Set (It Is Not Canceled When Ignition Key Is Turned To ACC Or ON Position) | Ignition Switch Circuit | ||||||||||
| When System Is Set (It Is Still Operating When Luggage Compartment Door Is Opened With Key) | (4) Luggage Compartment Door Key Lock & Unlock Switch Circuit | ||||||||||
| While System Is In Warning Operation (Horns Do Not Sound) | (5) Horn Circuit | ||||||||||
| Even When System Is Not Set (Horns Sound) | (5) Horn Circuit | ||||||||||
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RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.