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 315 (INTERIOR LIGHT SYSTEM)TROUBLESHOOTINGPROBLEM SYMPTOMS TABLEINTERIOR LIGHT SYSTEM
2004 Toyota Celica GT, Standard
Interior Light System
2004 Toyota Celica GT, StandardSECTION Interior Light System
WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
This system uses the multiplex communication system, so check diagnosis system of the multiplex communication system before you proceed with troubleshooting.
INTERIOR LIGHTS
| Symptom/Suspect Area | See | |
|---|---|---|
| All Lights Do Not Come ON | ||
| DOME Fuse | FUSES & CIRCUIT BREAKERS | |
| Driver's Door Courtesy Light Does Not Come ON When Driver's Door Is Opened | ||
| Driver's Door Courtesy Switch | STEP 3 - INSPECT DOOR COURTESY SWITCH CONTINUITY | |
| Wire Harness | Check Wiring Harness | |
| Body ECU | BODY CONTROL SYSTEM | |
| Passenger's Door Courtesy Light Does Not Come ON When Passenger's Door Is Opened | ||
| Passenger's Door Courtesy Switch | STEP 3 - INSPECT DOOR COURTESY SWITCH CONTINUITY | |
| Wire Harness | Check Wiring Harness | |
| Body ECU | BODY CONTROL SYSTEM | |
| Room Light Does Not Come On When Rear-Right Door Is Opened | ||
| Rear-Right Door Courtesy Switch | STEP 3 - INSPECT DOOR COURTESY SWITCH CONTINUITY | |
| Wire Harness | Check Wiring Harness | |
| Body ECU | BODY CONTROL SYSTEM | |
| Room Light | Check Wiring Harness | |
| Room Light Does Not Come On When Rear-Left Door Is Opened | ||
| Rear-Left Door Courtesy Switch | STEP 3 - INSPECT DOOR COURTESY SWITCH CONTINUITY | |
| Wire Harness | Check Wiring Harness | |
| Body ECU | BODY CONTROL SYSTEM | |
| Room Light | Check Room Light | |
| Only One Of The Bulbs Comes On | ||
| Bulb | Check Bulb | |
| Illumination Does Not Fade Out When All Doors Are Closed | ||
| Courtesy Switch | STEP 3 - INSPECT DOOR COURTESY SWITCH CONTINUITY | |
| Wire Harness | Check Wiring Harness | |
| Body ECU | BODY CONTROL SYSTEM | |
| Illumination Does Not Fade Out Immediately When Ignition Switch Is Turned To ACC Or On Within 15 Seconds After All Doors Are Closed | ||
| Ignition Switch | STEP 1 - INSPECT IGNITION SWITCH CONTINUITY | |
| ECU-B Fuse | FUSES & CIRCUIT BREAKERS | |
| Gauge Fuse | FUSES & CIRCUIT BREAKERS | |
| Wire Harness | Check Wiring Harness | |
| Body ECU | BODY CONTROL SYSTEM | |
| Illumination Does Not Fade Out Immediately When All Doors Are Locked Within 15 Seconds After They Are Closed | ||
| Door Unlock Detection Switch | APPROPRIATE DOOR UNLOCK DETECTION SWITCH TEST UNDER INSPECTION | |
| Wire Harness | Check Wiring Harness | |
| Body ECU | BODY CONTROL SYSTEM | |
| Interior Light Does Not Light Up (In Front Personal Light) | ||
| Bulb | Check Bulb | |
| Personal Light | STEP 2 - INSPECT INTERIOR LIGHT CONTINUITY | |
| Wire Harness | Check Wiring Harness | |
| Front Personal Light Does Not Light Up | ||
| Bulb | Check Bulb | |
| Personal Light | STEP 1 - INSPECT FRONT PERSONAL LIGHT CONTINUITY | |
| Wire Harness | Check Wiring Harness | |
| Rear Personal Light Does Not Light Up | ||
| Bulb | Check Bulb | |
| Interior Light | STEP 2 - INSPECT INTERIOR LIGHT CONTINUITY | |
| Wire Harness | Check Wiring Harness | |
| Luggage Compartment Light Does Not Light Up | ||
| Bulb | Check Bulb | |
| Luggage Compartment Door Courtesy Switch | STEP 5 - INSPECT LUGGAGE COMPARTMENT DOOR COURTESY SWITCH CONTINUITY | |
| Wire Harness | Check Wiring Harness | |
| Courtesy Light Does Not Light Up | ||
| Bulb | Check Bulb | |
| Door Courtesy Light | STEP 3 - INSPECT DOOR COURTESY SWITCH CONTINUITY | |
| Wire Harness | Check Wiring Harness | |
| Body ECU | BODY CONTROL SYSTEM | |
RENDER: 1.0x
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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.