LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2004 >> SC 430 >> Repair and Diagnosis >> External Pages >> Different car >> Section 362 (Power Seat Control System - Diagnosis) >> Problem Symptoms Table
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 REFERENCE

Symptom Suspect Area See Section
All function does not operate.
(Both left and right)
  1. ECU power source circuit
  2. Driver seat ECU
  1. CIRCUIT INSPECTION 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
"Slide operation" does not operate.
  1. Motor circuit
  2. Position sensor circuit
  3. Driver seat ECU
  1. POWER SEAT MOTOR 
  2. POSITION SENSOR CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
"Front vertical operation" does not operate.
  1. Motor circuit
  2. Position sensor circuit
  3. Driver seat ECU
  1. POWER SEAT MOTOR 
  2. POSITION SENSOR CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
"Lifter operation" does not operate.
  1. Motor circuit
  2. Position sensor circuit
  3. Driver seat ECU
  1. POWER SEAT MOTOR 
  2. POSITION SENSOR CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
"Reclining operation" does not operate.
  1. Motor circuit
  2. Position sensor circuit
  3. Driver seat ECU
  1. POWER SEAT MOTOR 
  2. POSITION SENSOR CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
"Headrest operation" does not operate.
  1. Motor circuit
  2. Position sensor circuit
  3. Driver seat ECU
  1. POWER SEAT MOTOR 
  2. POSITION SENSOR CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
"Seat cushion operation" does not operate.
  1. Seat cushion switch circuit
  2. Motor circuit
  3. Position sensor circuit
  4. Driver seat ECU
  1. POWER SEAT CUSHION SWITCH CIRCUIT 
  2. POWER SEAT MOTOR 
  3. POSITION SENSOR CIRCUIT 
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Seat position memory return function does not operate.
  1. Power seat memory switch circuit
  2. Position sensor circuit
  3. Driver seat ECU
  1. DRIVING POSITION MEMORY SWITCH CIRCUIT (W/ MEMORY)
  2. POSITION SENSOR CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
"Lumbar support operation" does not operate.
  1. Lumbar support switch circuit
  2. Motor circuit
  3. Position sensor circuit
  4. Driver seat ECU
  1. LUMBAR SUPPORT SWITCH AND MOTOR CIRCUIT 
  2. POWER SEAT MOTOR 
  3. POSITION SENSOR CIRCUIT 
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
scientia non olet · About LEMON Manuals