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 142 (KEYLESS ENTRY SYSTEMS)SELF-DIAGNOSTIC SYSTEMWIRELESS DOOR LOCK CONTROL SYSTEM DIAGNOSTIC MODE
2004 Toyota Celica GT, Standard
Wireless Door Lock Control System Diagnostic Mode
2004 Toyota Celica GT, StandardSECTION Wireless Door Lock Control System Diagnostic Mode
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.
- Wireless door lock control system can perform limited diagnostics to help narrow the cause of a malfunction. To begin diagnostic mode, insert key into ignition switch. Remove and insert key into ignition switch. Within 5 seconds of removing and inserting key into ignition switch, turn ignition switch to ON position. Within 30 seconds of turning ignition switch to ON position, cycle ignition OFF/ON 9 more times, ending with ignition switch in ON position. Wireless door lock control system buzzer should sound to signify that diagnostic mode has been entered.
- Depress buttons on remote transmitter one at a time and note sound output from wireless door lock control system buzzer. If buzzer chirps as specified in STEPS 1-3 of Fig 1, remote transmitters, door control receiver and buzzer are okay at this time. If buzzer chirps as specified in STEP 4 of Fig 1, confirm remote transmitter is registered. See PROGRAMMING . If buzzer does respond or does not chirp as specified, go to next step.
- If buzzer does not chirp, check wireless door lock control system buzzer. See WIRELESS DOOR LOCK CONTROL SYSTEM BUZZER under COMPONENT TESTS. If buzzer is okay, check remote transmitter. See REMOTE TRANSMITTER under COMPONENT TESTS. If remote transmitter is okay, go to next step.
- Check multiplex control system for DTCs and proper operation. See MULTIPLEX CONTROL SYSTEMS - AVALON under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. If multiplex control system is operating properly and no DTCs exist, check body control system. See BODY CONTROL SYSTEM under TROUBLE SHOOTING in BODY CONTROL SYSTEMS - AVALON article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. If body control system is operating properly, check wireless door lock control receiver. See WIRELESS DOOR LOCK CONTROL RECEIVER under COMPONENT TESTS.
- To exit diagnostic mode, turn ignition switch OFF/ON after checking transmitter button functions. Wireless door lock control system buzzer should sound to signify that diagnostic mode has been terminated.
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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.