2006 Lexus ES 330FACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

DEFOGGER SYSTEM - PROBLEM SYMPTOMS TABLE

Symptom Suspected Area Refer To
Rear window defogger does not operate (Indicator lamp on)
  1. DEF fuse (Driver side J/B)
  2. GAUGE 2 fuse (Driver side J/B)
  3. DEF relay (Driver side J/B)
  4. Rear window defogger wire
  5. Wire harness
  6. ECM
  1. POWER SOURCE
  2. POWER SOURCE
  3. INSPECTION 
  4. *
  5. x
  6. HOW TO PROCEED WITH TROUBLESHOOTING
Rear window defogger does not operate (Indicator lamp off)
  1. HTR fuse (Driver side J/B)
  2. Defogger switch (A/C panel)
  3. Wire harness
  1. POWER SOURCE
  2. INSPECTION 
  3. *
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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

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