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 249 (BODY ELECTRICAL SYSTEMS (TROUBLESHOOTING))TROUBLESHOOTINGPROBLEM SYMPTOMSINTERIOR 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 Sequoia. 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

⁽¹⁾

Body ECU

⁽²⁾

Light Does Not Come ON When Driver's Door Is Opened

Driver's Door Courtesy Switch

⁽³⁾

Wire Harness

.....

Light Does Not Come On When Passenger's Door Is Opened

Passenger's Door Courtesy Switch

⁽³⁾

Wire Harness

.....

Light Does Not Come On When Rear-Right Door Is Opened

Rear-Right Door Courtesy Switch

⁽³⁾

Wire Harness

.....

Light Does Not Come On When Rear-Left Door Is Opened

Rear-Left Door Courtesy Switch

⁽³⁾

Wire Harness

.....

Only One Of The Bulbs Comes On

Bulb

.....

Illumination Does Not Fade Out When All Doors Are Closed

Courtesy Switch

⁽³⁾

Wire Harness

.....

Illumination Does Not Fade Out Immediately When All Doors Are Locked Within 15 Seconds After They Are Closed

Door Unlock Detection Switch

⁽⁴⁾

Wire Harness

.....

Front Personal Light Does Not Light Up

Bulb

.....

Front Personal Light

⁽⁵⁾

Wire Harness

.....

Dome Light Does Not Light Up

Bulb

.....

Dome Light

⁽⁶⁾

Wire Harness

.....

Vanity Light Does Not Light Up

Bulb

.....

Vanity Light

⁽⁷⁾

Wire Harness

.....

Luggage Room Light Does Not Light Up

Bulb

.....

Back Door Courtesy Switch

⁽⁸⁾

Wire Harness

.....

Courtesy Light Does Not Light Up

Bulb

.....

Door Courtesy Switch

⁽³⁾

Wire Harness

.....

⁽¹⁾	FUSES & CIRCUIT BREAKERS

⁽²⁾	HOW TO PROCEED WITH TROUBLESHOOTING

⁽³⁾	See Step 5 Of INSPECTION

⁽⁴⁾	BACK DOOR UNLOCK DETECTION SWITCH CIRCUIT

⁽⁵⁾	See Step 2 Of INSPECTION

⁽⁶⁾	See Step 3 Of INSPECTION

⁽⁷⁾	See Step 7 Of INSPECTION

⁽⁸⁾	See Step 8 Of INSPECTION

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:

• 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.