Light Control System

2004 Toyota Celica GT, StandardSECTION Light Control System
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
LIGHT CONTROL SYSTEM - TROUBLESHOOTING

Symptom Suspect Area See Section
Only one side headlight does not light up.
  1. Bulb
  2. Head light circuit
  3. Light control computer
  1. -
  2. HEADLIGHT CIRCUIT
  3. -
Only one side taillight does not light up.
  1. Bulb
  2. Taillight circuit
  1. -
  2. TAILLIGHT CIRCUIT
Only one side turn signal does not light up (Front side).
  1. Bulb
  2. Turn signal light circuit
  1. -
  2. TURN SIGNAL LIGHT CIRCUIT
Only one side turn signal does not light up (Back side).
  1. Bulb
  2. Turn signal light circuit
  1. -
  2. TURN SIGNAL LIGHT CIRCUIT
Each interior light does not light up.
  1. Illumination light circuit (each bulb)
  1. ILLUMINATION (DOOR COURTESY SWITCH SIGNAL) CIRCUIT
Only one stop light does not light up.
  1. Bulb
  2. Stop light circuit
  1. -
  2. STOP LIGHT CIRCUIT
Only one back-up light does not light up.
  1. Bulb
  2. Back-up light circuit
  1. -
  2. BACK-UP LIGHT CIRCUIT
Only one front fog light does not light up.
  1. Bulb
  2. Front fog light circuit
  1. -
  2. FRONT FOG LIGHT CIRCUIT
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:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.