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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
Lock or unlock is not operated with door lock control switch.
  1. Door lock control switch circuit (Driver and passenger side)
  2. Driver door ECU
  3. Passenger door ECU
  4. Theft deterrent ECU
  1. DTC B1221 POWER WINDOW SWITCH CIRCUIT ON DRIVER, DTC B1222 DOOR LOCK SWITCH CIRCUIT ON DRIVER DOOR
  2. DTC B1223, B1224 POWER WINDOW/DOOR LOCK SWITCH CIRCUIT ON PASSENGER DOOR
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Door key-interlocked function does not operate.
  1. Door key lock and unlock switch circuit
  2. Driver door ECU
  3. Theft deterrent ECU
  1. -
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Key confinement prevention function does not operate. Key unlock warning switch circuit DTC B2780 KEY UNLOCK WARNING SWITCH MALFUNCTION
Door courtesy switch circuit
  1. Drive Door
  2. Passenger door
  3. Rear LH door
  4. Rear RH door
  1. DOOR COURTESY LIGHT AND COURTESY SWITCH CIRCUIT
  2. DOOR COURTESY LIGHT AND COURTESY SWITCH CIRCUIT
  3. DOOR COURTESY LIGHT AND COURTESY SWITCH CIRCUIT
  4. DOOR COURTESY LIGHT AND COURTESY SWITCH CIRCUIT
Door unlock detection switch circuit
  1. Drive Door
  2. Passenger door
  3. Rear LH door
  4. Rear RH door
  1. DOOR UNLOCK DETECTION SWITCH CIRCUIT
  2. DOOR UNLOCK DETECTION SWITCH CIRCUIT
  3. DOOR UNLOCK DETECTION SWITCH CIRCUIT
  4. DOOR UNLOCK DETECTION SWITCH CIRCUIT
Driver door ECU (Passenger door ECU) HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Theft deterrent ECU HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Only either door does not work. Door lock motor circuit
  1. Drive Door
  2. Passenger door
  3. Rear LH door
  4. Rear RH door
  1. DOOR LOCK MOTOR CIRCUIT
  2. DOOR LOCK MOTOR CIRCUIT
  3. DOOR LOCK MOTOR CIRCUIT
  4. DOOR LOCK MOTOR CIRCUIT
Any door ECU HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Shift lever-interlocked door lock function does not operate. Park/neutral position switch circuit DTC P0705: TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT)
Door lock motor circuit
  1. Drive Door
  2. Passenger door
  3. Rear LH door
  4. Rear RH door
  1. DOOR LOCK MOTOR CIRCUIT
  2. DOOR LOCK MOTOR CIRCUIT
  3. DOOR LOCK MOTOR CIRCUIT
  4. DOOR LOCK MOTOR CIRCUIT
Any door ECU HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Theft deterrent ECU HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
ECM HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
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