Lexus NX manuals

Lexus NX: System Description

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

SYSTEM DESCRIPTION

WIRELESS DOOR LOCK CONTROL SYSTEM

The wireless door lock control system can be used to lock and unlock all doors from a distance. The system is controlled by an electrical key transmitter sub-assembly which sends radio waves to the door control receiver. The certification ECU (smart key ECU assembly) performs an ID code identification process and operates the door lock control.

MULTI CHANNEL FUNCTION

The wireless door lock control system has a multi channel function. Each time the switch on the electrical key transmitter sub-assembly is pressed, the channel is switched alternately between 2 different frequencies and the signal is sent to the door control receiver.

FUNCTION OF MAIN COMPONENTS

Component

Function

Electrical key transmitter sub-assembly
  • Has the lock, unlock, back door open* and panic switches.
  • Transmits weak radio waves (recognition codes and function codes) to the door control receiver.
  • Illuminates the indicator light (LED) during transmission.

Door control receiver

Receives weak radio waves from the electrical key transmitter sub-assembly and sends them to the certification ECU (smart key ECU assembly).
  • Front door courtesy light switch assembly LH/RH
  • Rear door courtesy light switch assembly LH/RH
  • Back door courtesy light switch assembly
  • Turns on when a door is opened and turns off when it is closed.
  • Outputs door status signals (open or closed) to the main body ECU (multiplex network body ECU).
  • Front door lock assembly LH/RH
  • Rear door lock assembly LH/RH
  • The built-in motor locks or unlocks the door.
  • Transmits the door lock position of each door to the main body ECU (multiplex network body ECU).

Certification ECU (Smart key ECU assembly)

Sends wireless door lock control signals in response to the code data from the door control receiver and signals from each ECU.
  • *: w/ Power Back Door System

SYSTEM FUNCTION

The electrical key transmitter sub-assembly has lock, unlock, back door open* and panic switches. Operating these switches activates each function.

The wireless door lock control system has the following functions:

HINT:

Part of these functions can be customized.

Click here

Function

Operation

All door lock

Pressing the lock switch locks all doors.

All door unlock

Pressing the unlock switch unlocks all doors.

All door unlock

(Unlock 2 operation)

Pressing the unlock switch twice within 5 seconds unlocks all doors after the driver door is unlocked.

Back door open*3

Pressing the back door open switch of the electrical key transmitter sub-assembly for longer than about 0.8 seconds opens or closes the back door.

Automatic lock

If none of the doors is opened within 60 seconds after they are unlocked by the wireless door lock control, all doors will lock again automatically.

Answer-back (Hazard warning light)
  • When the doors are locked by wireless operation, the hazard warning lights flash once.
  • When the doors are unlocked by wireless operation, the hazard warning lights flash twice.

Answer-back (Wireless door lock buzzer)
  • When the doors are locked by wireless operation, the wireless door lock buzzer sounds once.
  • When the doors are unlocked by wireless operation, the wireless door lock buzzer sounds twice.
  • When the back door is opened or closed by wireless operation, the wireless door lock buzzer sounds*3.

Panic alarm

Pressing the panic switch of the electrical key transmitter sub-assembly for longer than about 0.8 seconds causes the following alarms to activate:

  • Sounds the vehicle horns and security horn.
  • Blinks the hazard warning lights.

While the panic alarm is operating, pressing any switch of the electrical key transmitter sub-assembly cancels the alarm operation.

Door ajar warning

The buzzer sounds when the lock switch is pressed when any of the doors are ajar, and it sounds for 5 seconds continuously. The buzzer stops when all doors are closed or the unlock switch is pressed.

Illuminated entry

When all doors are locked, pressing the unlock switch causes the interior lights to come on simultaneously with the unlock operation.

Self-diagnostic mode

If the door control receiver receives normal radio waves from the electrical key transmitter sub-assembly when the system is in diagnostic mode, it sounds the wireless door lock buzzer in a normal pattern that corresponds to the function of each switch.
  • *: w/ Power Back Door System

READ NEXT:

 How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: The wireless door lock control system troubleshooting procedure is based on the premise that the power door lock control system is operating properly. Check the power

 Operation Check

OPERATION CHECK NOTICE WHEN CHECKING FOLLOWING (a) Wireless door lock/unlock function: This wireless door lock control function operates only when the following 3 conditions are met: (1) The power swi

 Customize Parameters

CUSTOMIZE PARAMETERS CUSTOMIZE WIRELESS DOOR LOCK CONTROL SYSTEM HINT: The following items can be customized. NOTICE: When the customer requests a change in a function, first make sure that the fun

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 Power Steering Warning Light Circuit

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 Components

COMPONENTS ILLUSTRATION *A w/ AVS - - *1 FRONT SKID CONTROL SENSOR WIRE LH *2 FRONT SPEED SENSOR LH N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *A w/o AVS - - *1 FRONT SPEED SENSOR LH - - N*m (kgf*cm, ft.*lbf): Specified torqu

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