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Headlight And Taillight System:

WARNING: This page is about a different car, the 2004 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS TABLE - HEADLIGHT AND TAILLIGHT SYSTEM

Symptom Suspected Area
Headlight does not light up (taillight is normal)
  1. Passenger side J/B ECU
  2. H-LP fuse (LH, RH)
  3. Headlight relay circuit
  4. Headlight dimmer switch circuit
  5. Headlight dimmer switch
  6. Light control switch circuit
  7. Light control switch
  8. Headlight bulb
  9. Wire harness
Headlight does not light up (taillight does not light up)
  1. Passenger side J/B ECU
  2. Light control switch circuit
  3. Light control switch
  4. Headlight bulb
  5. Wire harness
Only one side headlight does not light up
  1. H-LP fuse (LH, RH)
  2. Headlight bulb
  3. Wire harness
"Lo-Beam" does not light up (all)
  1. Passenger side J/B ECU
  2. Headlight dimmer switch circuit
  3. Headlight dimmer switch
  4. Wire harness
"Lo-Beam" does not light up (one side)
  1. H-LP LH fuse
  2. H-LP RH fuse
  3. Headlight bulb
  4. Wire harness
"Hi-Beam" does not light up (all)
  1. Passenger side J/B ECU
  2. Headlight dimmer switch circuit
  3. Headlight dimmer switch
  4. Wire harness
"Hi-Beam" does not light up (one side)
  1. H-LP LH fuse
  2. H-LP RH fuse
  3. Headlight bulb
  4. Wire harness
"Flash" does not light up
  1. Passenger side J/B ECU
  2. Headlight dimmer switch circuit
  3. Headlight dimmer switch
  4. Wire harness
Light-on warning system does not operate
  1. Passenger side J/B ECU
  2. GAUGE fuse
  3. Door courtesy switch circuit
  4. Door courtesy switch (driver's)
  5. Combination meter
  6. Wire harness
Headlight does not light up with light control switch in HEAD
  1. Passenger side J/B ECU
  2. Light control switch circuit
  3. Light control switch
  4. Wire harness
Headlight does not turn off with light control switch in OFF
  1. Passenger side J/B ECU
  2. Light control switch circuit
  3. Light control switch
  4. Wire harness
Taillight does not light up with light control switch in TAIL
  1. Passenger side J/B ECU
  2. Taillight control relay circuit
  3. Taillight control relay
  4. Light control switch circuit
  5. Light control switch
  6. Wire harness
Taillight does not turn off with light control switch in OFF
  1. Passenger side J/B ECU
  2. Taillight control relay circuit
  3. Taillight control relay
  4. Light control switch circuit
  5. Light control switch
  6. Wire harness
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