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Power Door Lock Control System:

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 left side door lock does not operate.
  1. Power source circuit
  2. Door lock motor circuit
  3. Rear door LH ECU
  4. Theft deterrent ECU
  1. POWER SOURCE CIRCUIT 
  2. DOOR LOCK MOTOR CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Key confinement prevention function does not operate.
  1. Door courtesy switch circuit
  2. Door unlock detection switch circuit
  3. Rear door LH ECU
  4. Theft deterrent ECU
  1. DOOR COURTESY LIGHT AND COURTESY SWITCH CIRCUIT 
  2. DOOR UNLOCK DETECTION SWITCH CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
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