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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
Passenger side door lock does not operate.
  1. Door lock motor circuit
  2. Passenger door ECU
  3. Theft deterrent ECU
  1. DOOR LOCK MOTOR CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Door key related function does not operate.
  1. Door unlock detection switch circuit
  2. Door courtesy light and courtesy switch circuit
  3. Passenger door ECU
  4. Theft deterrent ECU
  1. DOOR UNLOCK DETECTION SWITCH CIRCUIT 
  2. DOOR COURTESY LIGHT AND COURTESY SWITCH 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 light and courtesy switch circuit
  2. Door unlock detection switch circuit
  3. Passenger door 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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