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 147 (BODY CONTROL SYSTEM)CIRCUIT TESTSANTI-THEFT INDICATOR CIRCUITDIAGNOSTIC PROCEDURE
2004 Toyota Celica GT, Standard
Diagnostic Procedure
2004 Toyota Celica GT, StandardSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If not using the hand-held tester, start the inspection from step 2.
- Check the anti-theft indicator using the hand-held tester. Connect the hand-held tester to the DLC3. See Figure. Connect terminals Tc and E1 of the DLC1. See CONNECTOR IDENTIFICATION . Check that the anti-theft indicator can light in an ACTIVE TEST. If the results are OK, perform the next test procedure of the problem symptom. See step 4 of the SYSTEM OPERATION CHECK under TROUBLE SHOOTING. If the results are not good, go to the next step.
- Check the anti-theft indicator. See ANTI-THEFT SYSTEM article under DOOR LOCKS & ANTI-THEFT SYSTEMS in ACCESSORIES & EQUIPMENT. If the results are OK, go to the next step. If the results are not good, replace the anti-theft indicator.
- Check the wiring harness and connector between the anti-theft indicator and body ECU, anti-theft indicator and body ground. If the results are OK, perform the next test procedure of the problem symptom. See step 4 of the SYSTEM OPERATION CHECK under TROUBLE SHOOTING. If the results are not good, repair or replace the wiring harness or connector.
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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.