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Problem Symptoms Table

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS TABLE - FRONT POWER SEAT CONTROL SYSTEM

Symptom Suspected Area
Power seat does not operate (manual or memorized positions).
  1. Power source circuit
  2. Position control ECU & switch assy
One function of power seat does not operate (manual or memorized positions).
  1. Power seat motor circuit
  2. Position control ECU & switch assy
One or all manual seat functions do not operate (memorized positions OK).
  1. Position control ECU & switch assy
Memory function does not operate.
  1. Power source circuit
  2. Power seat memory switch circuit
  3. Park/neutral position switch circuit
  4. Door courtesy switch circuit
  5. Position control ECU & switch assy
All memory functions do not operate or operate a little then stop (manual functions OK).
  1. Power source circuit
  2. Position control ECU & switch assy
One memory function does not operate or operates a little then stops (manual functions OK).
  1. Position control ECU & switch assy
  2. Power seat motor assy
Lumbar support does not operate.
  1. Power seat control switch circuit
The power seat control system does not control the storing and restoring of the adjustable pedal and power mirror position.
  1. Communication circuit
  2. Position control ECU & switch assy
  3. Outer Mirror Control ECU
  4. Adjustable pedal ECU
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