2006 Lexus GS 430FACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

HINT:

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

Rear Window defogger 

PROBLEM SYMPTOMS TABLE

Symptom Suspected area See
Rear window defogger system does not operate DEFOG H-fuse REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE 
ALT H-fuse REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE 
LH J/B-AM H-fuse REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE 
RH J/B-B H-fuse REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE 
AM1 fuse REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE 
LH-IG fuse REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE 
DEFOG relay REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE 
Power source control ECU REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE 
Multi-display REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE 
A/C amplifier assembly (A/C ECU) REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE 
ECM REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE 
Wire harness REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE 
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.