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Problem Symptoms Table

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS

Symptom Suspect Area See Section
Rear right side power seat system does not operate.
  1. ECU power source circuit
  2. Rear seat switch circuit
  3. Rear RH seat, ECU
  1. CIRCUIT INSPECTION 
  2. REAR SEAT CONTROL SWITCH CIRCUIT
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
"Slide operation" does not operate.
  1. Rear seat switch circuit
  2. Motor circuit
  3. Position sensor circuit
  4. Rear RH seat ECU
  1. REAR SEAT CONTROL SWITCH CIRCUIT
  2. SLIDE POWER SEAT MOTOR CIRCUIT 
  3. SLIDE POSITION SENSOR CIRCUIT 
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
"Headrest operation" does not operate.
  1. Rear seat switch circuit
  2. Motor circuit
  3. Headrest limit switch circuit
  4. Position sensor circuit
  5. Rear RH seat ECU
  1. REAR SEAT CONTROL SWITCH CIRCUIT
  2. HEADREST MOTOR AND POSITION SENSOR CIRCUIT 
  3. HEADREST LIMIT SWITCH CIRCUIT 
  4. HEADREST MOTOR AND POSITION SENSOR CIRCUIT 
  5. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Seat position memory function does not operate.
  1. Rear seat switch circuit
  2. Rear seat memory switch
  3. Position sensor circuit
  4. Rear left seat control ECU
  5. Rear Door RH ECU
  1. REAR SEAT CONTROL SWITCH CIRCUIT
  2. REAR SEAT MEMORY SWITCH CIRCUIT (W/ MEMORY)
  3. SLIDE POSITION SENSOR CIRCUIT 
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  5. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Seat position return function does not operate.
  1. Rear seat switch circuit
  2. Rear seat turn switch circuit
  3. Rear RH seat ECU
  4. Passenger side J/B ECU
  1. REAR SEAT CONTROL SWITCH CIRCUIT
  2. REAR SEAT RETURN SWITCH CIRCUIT
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Door open return function does not operate.
  1. Rear seat switch circuit
  2. Door courtesy switch circuit
  3. Rear RH seat ECU
  1. REAR SEAT CONTROL SWITCH CIRCUIT
  2. DOOR COURTESY LIGHT AND COURTESY SWITCH CIRCUIT
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Vibration seat function does not operate.
  1. Rear seat switch circuit
  2. Vibration seat ECU communication circuit
  3. Vibration circuit
  4. Rear RH seat ECU
  1. REAR SEAT CONTROL SWITCH CIRCUIT
  2. VIBRATION SEAT ECU COMMUNICATION CIRCUIT 
  3. VIBRATION CIRCUIT 
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
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