Lexus NX manuals

Lexus NX: System Description

Lexus NX Service Manual / Vehicle Interior / Door Lock / Power Door Lock Control System / System Description

SYSTEM DESCRIPTION

POWER DOOR LOCK CONTROL SYSTEM DESCRIPTION

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

The main body ECU (multiplex network body ECU) receives lock/unlock request signals from a door control switch or the driver door key lock and unlock switch. Then, the main body ECU (multiplex network body ECU) sends these request signals to the door lock motors in each door to lock/unlock each door in response to the inputs.

FUNCTION OF MAIN COMPONENTS

Component

Function

Multiplex network master switch assembly

  • Door control switch

Door control switch on the multiplex network master switch assembly locks or unlocks all doors.

Door control switch assembly

Door control switch assembly locks or unlocks all doors.

Door courtesy light switch assembly
  • Placed on each door.
  • Detects the door status (open or closed) and outputs data to the main body ECU (multiplex network body ECU).
  • Turns on when the door is opened and turns off when the door is closed.

Front door lock assembly LH
  • Built-in motor locks or unlocks the door.
  • Built-in key lock and unlock switch (key-linked) detects the door key operation status (locked or unlocked) and outputs a signal to the main body ECU (multiplex network body ECU).
  • Built-in unlock detection switch detects the door status (locked or unlocked) and outputs a signal to the main body ECU (multiplex network body ECU). This switch turns off when the door is locked and turns on when the door is unlocked.

Front door lock assembly RH

Rear door lock assembly LH/RH
  • Built-in motor locks or unlocks the door.
  • Built-in unlock detection switch detects the door status (locked or unlocked) and outputs a signal to the main body ECU (multiplex network body ECU). This switch turns off when the door is locked and turns on when the door is unlocked.

Back door lock assembly

Built-in motor locks or unlocks the door.

SYSTEM FUNCTION

(a) This system is controlled by the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) outputs signals to each door lock motor. The power door lock control system has the following functions:

Function

Outline

Manual lock and unlock function

This function can lock or unlock all doors by the door 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 performed.

Manual unlock prohibition function

When the condition below is met, unlocking the vehicle using the door control switch will be prohibited:

  • The doors are locked using a key-linked operation, wireless key operation or entry operation with all doors closed.

Key lock-in prevention function

When the key is in the vehicle, performing the door lock operation will not lock the door.

Key-linked 2-step unlock function

Unlocks only the driver door by turning the key cylinder once and unlocks all doors by turning it twice.

Collision door lock release

If the SRS has been deployed and the main body ECU (multiplex network body ECU) has detected the signal that is output from the airbag ECU assembly, the main body ECU (multiplex network body ECU) will unlock all doors.

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.
  • Power switch is on (IG).
  • With the shift lever in P, the shift lever is moved to any position other than P.
  • Any of the doors is unlocked.

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 of the doors is unlocked.

Shift-linked automatic door unlock function

When the conditions listed below are met consecutively, this function causes all doors to be automatically unlocked:

  • Power switch is on (IG).
  • With the shift lever in any position other than P, the shift lever is moved to P.

Driver door-linked automatic door unlock

All doors are unlocked automatically when the driver door is opened within approximately 43 seconds of the power switch being turned from on (IG) to off.

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