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.
Test No. 11: Brake Light/Taillight In Rear Combination Light Does Not Operate
2004 Toyota Celica GT, StandardSECTION Test No. 11: Brake Light/Taillight In Rear Combination Light Does Not Operate
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.
NOTE:
Rear combination light assembly is entire taillight assembly consisting of taillight, stoplight and side marker light.
- Check light bulb on light that is not operating. If bulb is okay, go to next step. If bulb is defective, replace light bulb. After repairs, perform confirmation test. See CONFIRMATION TEST .
- Check light failure sensor. See LIGHT FAILURE SENSOR under COMPONENT TESTS. If light failure sensor is okay, go to next step. If light failure sensor is defective, replace light failure sensor. See LIGHT FAILURE SENSOR under REMOVAL & INSTALLATION. After repairs, perform confirmation test. See CONFIRMATION TEST .
- Check wiring harnesses and electrical connectors between battery and taillight control relay, between taillight control relay and body control ECU, between taillight control relay and TAIL (10-amp) fuse, between TAIL (10-amp) fuse and light failure sensor, between body control ECU and light control switch, and between light failure sensor and taillight bulbs. See EXTERIOR LIGHTS in SYSTEM WIRING DIAGRAMS article. Repair wiring harnesses or electrical connectors as necessary. After repairs, perform confirmation test. See CONFIRMATION TEST .
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.