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Defogger System

WARNING: This page is about a different car, the 2003 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.

PROBLEM SYMPTOMS - DEFOGGER SYSTEM

Symptom Suspect Area Go To
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. DEFOGGERS
  4. AIR CONDITIONING SYSTEM (DIAGNOSIS)
  5. INSPECTION
  6. INSPECTION
  7. -
  8. BODY CONTROL SYSTEM
  9. AIR CONDITIONING SYSTEM (DIAGNOSIS)
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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