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Headlight And Taillight System:

WARNING: This page is about a different car, the 2004 Toyota Celica. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS TABLE - HEADLIGHT AND TAILLIGHT SYSTEM

Symptom Suspect Area
Headlight does not come on.
  1. Light control switch circuit
  2. Headlight control relay circuit
  3. Body ECU
Taillight does not come on.
  1. Light control switch circuit
  2. Taillight relay circuit
  3. Body ECU
Automatic light control system does not operate.
  1. Automatic light control sensor circuit
  2. Light switch circuit
  3. Body ECU
Auto turn-off system does not operate.
  1. Driver door courtesy switch circuit
  2. Body ECU
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