Toyota 4Runner: System Description

Toyota 4Runner Service Manual / Vehicle Interior / Door Lock / Wireless Door Lock Control System(w/o Smart Key System) / System Description

SYSTEM DESCRIPTION

1. WIRELESS DOOR LOCK CONTROL SYSTEM DESCRIPTION

(a) This system locks/unlocks the vehicle doors remotely. The wireless control system has the following features:

The door control receiver performs the code identification procedure and the main body ECU operates the door lock control. A serial data link is provided for communication between the receiver and main body ECU.
A key-integrated type transmitter is used and it contains the following 3 switches: the lock switch, unlock switch and panic switch.

2. FUNCTION OF MAIN COMPONENTS

Component	Function
Door control transmitter	Contains the lock, unlock and panic switches. Transmits weak electric waves (recognition codes and function codes) to the door control receiver.
Door control receiver	Receives weak electric waves (recognition codes and function codes) from the door control transmitter via the electrical key antenna and changes the waves to code data.
Door lock position switch	Transmits the door lock positions of each door to the main body ECU.
Unlock warning switch	Detects if the key is in the ignition key cylinder.
Wireless door lock buzzer	Sounds when the door ajar warning function is operating.
Front door courtesy light switch Rear door courtesy light switch Back door courtesy light switch	Turns on when the door is opened and off when the door is closed. Outputs the door status (open or closed) to the main body ECU.

3. SYSTEM FUNCTION

(a) The wireless door lock control system has the following functions.

Function	Outline
All door lock function	Pressing the lock switch locks all the doors.
All door unlock (Unlock 2 operation)	Pressing the unlock switch twice within 3 seconds unlocks all the doors after the driver door is unlocked.
Answer-back function	When the doors are locked by wireless operation, the hazard warning lights flash once and the wireless door lock buzzer sounds once. When the doors are unlocked by wireless operation, the hazard warning lights flash twice and the wireless door lock buzzer sounds twice.
Automatic locking function	If no doors are opened within 60 seconds after being unlocked by the wireless transmitter, all the doors are locked again automatically.
Illuminated entry function	When the map light door switch is on and all the doors are locked, pressing the unlock switch causes the dome light (map light and No. 1 room light) illumination to turn on and all the doors to unlock simultaneously. If the doors have not been opened, the dome light (map light and No. 1 room light) turns off in approximately 15 seconds.
Door ajar warning function	If any door is open or ajar, pressing the lock switch causes the wireless door lock buzzer to sound for approximately 5 seconds.
Panic alarm function	Pressing the panic switch of the transmitter for more than approximately 0.8 seconds causes the following alarms to activate: Sounds the horn and security horn. Flashes the headlights, taillights and hazard warning lights. Illuminates the interior lights (when the map light door switch is on). While the panic alarm is operating, pressing any switch of the transmitter cancels the alarm operation.

HINT:

With no key in the ignition key cylinder (unlock warning switch is off) and all the door courtesy light switches off, pressing the lock or unlock switch of the door control transmitter causes the transmitter to output weak electrical waves to the door control receiver.

System Diagram

SYSTEM DIAGRAM ...

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: The wireless door lock control system troubleshooting procedures are based on the premise that the power door lock control system is operating normally. ...

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