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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.
POWER DOOR LOCK CONTROL SYSTEM

Symptom Suspect Area See Section
All the doors can not be locked or unlocked.
  1. Power source circuit
  2. Theft deterrent ECU
  3. Driver door ECU
  1. POWER SOURCE CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Driver side door lock does not operate.
  1. Door lock motor circuit
  2. Driver 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 cannot be done.
  1. Door lock switch circuit
  2. Door courtesy light and courtesy switch circuit
  3. Theft deterrent ECU
  4. Driver door ECU
  1. DOOR KEY LOCK AND UNLOCK 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. Theft deterrent ECU
  4. Driver door 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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