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. 8: Flash Feature Does Not Operate (Without Daytime Running Lights)
2004 Toyota Celica GT, StandardSECTION Test No. 8: Flash Feature Does Not Operate (Without Daytime Running Lights)
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.
- Check headlight dimmer switch. See HEADLIGHT DIMMER SWITCH under COMPONENT TESTS under STEERING COLUMN SWITCHES - AVALON article in ACCESSORIES & EQUIPMENT. If headlight dimmer switch is okay, go to next step. If headlight dimmer switch is defective, replace light control switch. After repairs, perform confirmation test. See CONFIRMATION TEST .
- Check wiring harness and electrical connectors between body control ECU and light control switch, between light control switch and headlights, and all ground connections. See HEADLIGHTS in SYSTEM WIRING DIAGRAMS article. Repair wiring harness or electrical connector as necessary. After repairs, perform confirmation test. See CONFIRMATION TEST .
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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.