DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM: SYSTEM DESCRIPTION (2008 LX570)

SYSTEM DESCRIPTION

1. FUNCTION OF MAIN COMPONENT

Components	Function
Master switch	The door control switch on the master switch locks/unlocks all doors.
Door control switch	Locks/unlocks all doors.
Door courtesy light switch	Turns on when the door is open and off when the door is closed. Outputs the door status (open or closed) to the main body ECU.
Front door lock LH	The built-in motor locks/unlocks the door. The built-in door control switch position (key-linked) detects the door key cylinder status (lock or unlock) and outputs the data to the main body ECU. The built-in position switch detects the door status (locked or unlocked) and outputs the data to the main body ECU. This switch turns off when the door is locked and on when the door is unlocked.
Front door lock RH Rear door lock LH Rear door lock RH	The built-in motor locks/unlocks the door. The built-in position switch detects the door status (locked or unlocked) and outputs the data to the main body ECU. This switch turns off when the door is locked and on when the door is unlocked.
Back door lock	The built-in motor opens the door.1 The built-in motor opens/closes the door.2 Performs the back door open operation according to the door position determination of the main body ECU.1 Performs the back door open/close operation according to the door position as determined by the power back door ECU.2

*1: w/o Power Back Door

*2: w/ Power Back Door

2. SYSTEM DESCRIPTION

(a) The power door lock system locks/unlocks all doors.

The door control switch of the master switch uses the LIN line to send lock/unlock request signals to the main body ECU.
The driver door key cylinder lock/unlock request signals are sent to the main body ECU from the front door lock LH.
The passenger door control switch lock/unlock request signals are sent to the main body ECU from the front door lock RH.
The main body ECU receives the request signals and locks/unlocks each door.

The door control system has the following functions:

Function	Outline
Manual lock and unlock function	Locks/unlocks all doors by the door control switch lock operation (manual operation).
Key-linked lock and unlock function	Linked with the door key cylinder. Locks/unlocks all doors when the lock/unlock operation is possible.
Key lock-in prevention function	When the door control transmitter is in the vehicle, performing the door lock operation with the lock switch on the outer handle will not lock the door and will sound a buzzer.
Collision door lock release	If the SRS has been deployed and the main body ECU has detected the signal that is output from the airbag sensor, the main body ECU will unlock all doors.
2-step unlock function	Unlocks only the driver side door by turning the key cylinder once and unlocks the other doors by turning it twice.
Shift-linked automatic door lock	When the conditions listed below are all met, this function causes all doors to automatically lock: The engine switch is on (IG). All doors are closed. The shift lever is moved out of P.
Shift-linked automatic door unlock	When the engine switch is on (IG), when moving the shift lever is moved to P from any other position, all the doors will be automatically unlocked.
Speed-sensitive automatic door lock*	When the doors are unlocked and the vehicle reaches a speed of 20 km/h (12 mph) or more, all doors are locked.
Door open-linked automatic door unlock*	When the driver side door is opened within 10 seconds after the engine switch is turned off, the other doors are unlocked.

*: This function is set through the customize function, as it is off by default.