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Problem Symptoms Table

WARNING: This page is about a different car, the 2005 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS TABLE - RAIN SENSOR SYSTEM

Symptom Suspect Area
Auto wiper system does not operate (All functions).
  1. Front wiper switch
  2. Front wiper switch circuit
  3. Wiper control ECU power source circuit
  4. IG switch circuit
  5. Front wiper motor circuit
  6. Front wiper position circuit
  7. Front wiper motor
  8. Wiper control ECU
Raindrop Sensing Function does not operate (When the position is in "Auto", the system becomes vehicle speed-sensing adjustable interval INT function).
  1. Rain sensor circuit
  2. Rain sensor
  3. Wiper control ECU
Vehicle Speed Switching Function Function does not operate.
  1. Neutral signal circuit
  2. Stop light switch circuit
  3. Stop light switch
  4. Wiper control ECU
Washer-Linked Wiper with Drip-Preventive Function does not operate.
  1. Front wiper switch (front washer switch)
  2. Front washer switch circuit
  3. Wiper control ECU
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