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Defogger System

WARNING: This page is about a different car, the 2004 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

This system uses the multiplex communication system, so check diagnosis system of the multiplex communication system before you proceed with troubleshooting.

DEFOGGER SYSTEM PROBLEM SYMPTOMS

Symptom Suspect Area Action
Rear window defogger does not operate.
  1. HTR Fuse
  2. DEF M-Fuse
  3. Defogger Relay Circuit
  4. Defogger Switch (in A/C Panel Switch)
  5. Defogger Wire
  6. Wire Harness
  7. Body ECU
  8. Noise Filter
  9. A/C ECU
  1. LOCATION
  2. LOCATION
  3. REAR DEFOGGER RELAY CIRCUIT
  4. HOW TO PROCEED WITH TROUBLESHOOTING
  5. INSPECTION
  6. -
  7. HOW TO PROCEED WITH TROUBLESHOOTING
  8. -
  9. HOW TO PROCEED WITH TROUBLESHOOTING
Mirror heater does not operate.
  1. MIR-HTR Fuse (Passenger Side J/B)
  2. Mirror Heater Relay
  3. Mirror Heater
  4. Wire Harness
  1. LOCATION
  2. INSPECTION
  3. INSPECTION
  4. -
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