Toyota Venza: System Description

Toyota Venza Service Manual / Door Lock / Power Door Lock Control System / System Description

SYSTEM DESCRIPTION

1. POWER DOOR LOCK CONTROL SYSTEM DESCRIPTION

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

The door control switch sends "lock/unlock" request signals to the main body ECU (driver side junction block assembly). Then, the main body ECU (driver side junction block assembly) sends these request signals to the lock motors in each door to lock/unlock all doors at once in response to the inputs.

Operating the driver door lock using a mechanical key sends request signals to lock/unlock door to the main body ECU (driver side junction block assembly).

2. FUNCTION OF MAIN COMPONENTS

Component	Function
Door control switch	Driver side door control switch on power window regulator master switch assembly and front passenger side door control switch locks or unlocks all doors.
Door courtesy switch assembly	Placed on each door. Detects door status (open or closed) and outputs data to main body ECU (driver side junction block assembly). Turns on when door is opened and turns off when door is closed.
Front door lock assembly LH	Built-in motor locks or unlocks door. Built-in door control switch (key-linked) detects door key operation status (locked or unlocked) and outputs a signal to main body ECU (driver side junction block assembly). Built-in position switch detects door status (locked or unlocked) and outputs a signal to main body ECU (driver side junction block assembly). This switch turns off when door is locked and turns on when door is unlocked.
Front door lock assembly RH	Built-in motor locks or unlocks door. Built-in position switch detects door status (locked or unlocked) and outputs a signal to main body ECU (driver side junction block assembly). This switch turns off when door is locked and turns on when door is unlocked.
Rear door lock assembly LH/RH	Built-in motor locks or unlocks door. Built-in position switch detects door status (locked or unlocked) and outputs a signal to main body ECU (driver side junction block assembly). This switch turns off when door is locked and turns on when door is unlocked.
Back door lock assembly	Built-in motor opens/closes door. Performs back door open/close operation according to door position as determined by back door closer ECU1 or power back door ECU2.

*1: w/o Power Back Door System
*2: w/ Power Back Door System

3. SYSTEM FUNCTION

(a) This system is controlled by the main body ECU (driver side junction block assembly). The main body ECU (driver side junction block assembly) sends signals to each door lock motor. The door lock control system of the vehicle has the following functions:

Function	Outline
Manual lock and unlock function	This function can lock or unlock all doors by the door lock control switch operation.
Key-linked lock and unlock function	This function, which is linked with the mechanical key cylinder, can lock or unlock all doors when a lock or unlock operation is effected.
Manual unlock prohibition function	When the condition below is met, unlocking the vehicle using the door lock control switch will be prohibited. The doors are locked using a mechanical key or door control transmitter with all doors closed.
Key lock-in prevention function	When the key is in the vehicle, performing the door lock operation with the lock switch on the outer handle will not lock the door.
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 function	When the conditions listed below are met consecutively, this function causes all doors to be automatically locked. All doors are closed. The ignition switch is ON. The shift lever is moved out of P.
Shift-linked automatic door unlock function	When the conditions listed below are met consecutively, this function causes all doors to be automatically unlocked. The ignition switch is ON. The shift lever is moved to P from any position other than P.
Speed-sensitive automatic door lock function*	When the conditions listed below are met consecutively, this function causes all doors to be automatically locked. Vehicle speed is higher than approximately 20 km/h (12 mph). All doors are closed. Any one of the doors is unlocked.
Opening driver door-linked automatic door unlock*	All doors are unlocked automatically when the driver door is opened within 10 seconds after the ignition switch is turned from ON to ACC or off.

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

System Diagram

SYSTEM DIAGRAM ...

How To Proceed With Troubleshooting

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