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Wireless Door Lock Control

WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
WIRELESS DOOR LOCK CONTROL SYSTEM

Symptom/Suspect Area See
All Functions Of Wireless Door Lock Control System Do Not Operate
Transmitter (1)
Wireless Tuner Circuit (2)
Key Unlock Warning Switch Circuit (3)
Body ECU (4)
Lock (Or Unlock) Function Does Not Operate
Door Unlock Detection Switch (Driver's) (5)
Door Unlock Detection Switch (Passenger's) (6)
Door Unlock Detection Switch (Rear Door) (7)
Door Unlock Detection Switch (Back Door) (8)
Any Door ECU (4)
Body ECU (4)
Automatic Lock Function Operates Even If Any Door Is Opened Within 30 Seconds After All Doors Are Unlocked By Wireless Door Lock Control System
Door Courtesy Switch (9)
Any Door ECU (4)
Body ECU (4)
Wireless Door Lock Operates, But Buzzer Does Not Sound
Wireless Door Lock Buzzer Circuit (10)
Body ECU (4)
Buzzer Sound, But Wireless Door Lock Function Does Not Operate
Body ECU (4)
(1) INSPECT WIRELESS DOOR LOCK TRANSMITTER OPERATION
(2) WIRELESS DOOR LOCK TUNER CIRCUIT 
(3) KEY UNLOCK WARNING SWITCH CIRCUIT 
(4) HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
(5) DOOR KEY LOCK AND UNLOCK SWITCH CIRCUIT
(6) DOOR UNLOCK DETECTION SWITCH CIRCUIT
(7) REAR DOOR UNLOCK DETECTION SWITCH CIRCUIT 
(8) BACK DOOR UNLOCK DETECTION SWITCH CIRCUIT
(9) DOOR COURTESY SWITCH CIRCUIT 
(10) WIRELESS DOOR LOCK BUZZER CIRCUIT