Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: System Description

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Start Function) / System Description

SYSTEM DESCRIPTION

SYSTEM FUNCTION

Function

Outline

Push-button start function

When the electrical key transmitter sub-assembly is brought into the vehicle and verified, this function changes the power source or starts the engine when the engine switch and brake pedal are operated.

HINT:

If an emergency stop was performed (the engine switch was pressed quickly three times or more, or pressed and held for 2 seconds or more) while driving, the engine can be started again if driving at more than 5 km/h, by moving the shift lever to N and pressing the engine switch.

Transmitter battery saving function for key

If a switch on the electrical key transmitter sub-assembly is depressed and held, this function stops transmission of the signal after approximately 20 seconds to save transmitter battery power.

Transmitter battery saving mode function
  • If the unlock switch of the electrical key transmitter sub-assembly is pressed twice while the lock switch is being pressed, the electrical key transmitter sub-assembly LED blinks 4 times and enters transmitter battery saving mode.
  • The smart access system with push-button start does not operate while in transmitter battery saving mode.
  • If a switch of the electrical key transmitter sub-assembly is pressed, transmitter battery saving mode will be canceled.

Key cancel function

Cancels the smart access system with push-button start when certain operations are performed.

Immobiliser function

Allows the engine to be started only by registered electrical key transmitter sub-assemblies to prevent an unauthorized engine start.

Automatic power off function
  • With the shift lever in P and the engine switch on (ACC) (the engine is not started and the vehicle is not moving), the power automatically turns off when the vehicle is left as is for 20 minutes or more.
  • With the shift lever in P and the engine switch on (IG) (the engine is not started and the vehicle is not moving), the power automatically turns off when the vehicle is left as is for 60 minutes or more.

Remote service function (remote engine start)*

Sends remote air conditioner with remote start operation signals requested by the user using an electrical key transmitter sub-assembly or application to the certification ECU (smart key ECU assembly).
  • *: w/ Lexus Enform Remote

REMOTE ENGINE START AND STOP FUNCTION (w/ Lexus Enform Remote)

(a) Remote engine start and stop function (start operation)

(1) When using the electrical key transmitter sub-assembly:

  1. Point the electrical key transmitter sub-assembly at the vehicle and press and release the lock switch twice. Immediately press and hold the lock switch.

HINT:

The engine can be started start by the remote engine start and stop function when all of the following conditions are met:

  • All of the doors are closed.
  • The engine hood is closed.
  • The engine switch is off.
  • The electrical key transmitter sub-assembly is not in the vehicle.
  • The battery voltage is 11 V or higher.
  • The cumulative engine running time after being started by remote engine start and stop is less than 15 minutes.
  • All of the doors are locked.
  • The engine has not already been started by remote engine start and stop.

(2) When using the application:

Click here

(b) Remote engine start and stop function (stop operation)

(1) When using the electrical key transmitter sub-assembly, perform either of the following operations:

  1. Press the unlock switch.
  2. Press and hold the lock switch.

HINT:

The engine will stop when any of the following conditions is met:

  • Any door is opened.
  • The engine hood is opened.
  • The engine switch is pressed.
  • A stop request is received from the electrical key transmitter sub-assembly or Service Center.
  • The theft deterrent system enters the alarm sounding state.
  • The battery voltage drops to less than 11 V.
  • 10 minutes elapse after the engine is started.
  • The cumulative engine running time after being started by remote engine start and stop is 20 minutes or more.
  • The shift lever is moved to a position other than P.
  • The vehicle speed is 5 km/h or more.
  • The stop lights illuminate or its condition cannot be determined.
  • Any door is unlocked.
  • The engine speed is more than 3000 rpm for 0.2 seconds.
  • The engine speed is 0 rpm for 0.2 seconds.
  • The engine is malfunctioning.
  • The fuel level warning is displayed on the multi-information display in the combination meter assembly.

(2) When using the application:

Click here

(c) Remote air conditioner system

Click here

DETECTION AREA

NOTICE:

  • Depending on the vehicle body shape, the electrical key transmitter sub-assembly may not operate in certain locations.
  • Even if the electrical key transmitter sub-assembly is in the vehicle interior detection area, it may not be properly detected if it is on the instrument panel, in the glove box or on the floor.
  • Depending on the way the electrical key transmitter sub-assembly is held, the electrical key transmitter sub-assembly may not operate properly.
  • The key detection area may reduce in size or the electrical key transmitter sub-assembly may not be properly detected under the following conditions:
    • The transmitter battery is depleted.
    • There are TV towers, electric power plants, broadcasting stations, gas stations or other facilities that generate strong radio waves or electrical noise nearby.
    • Electronic devices such as cell phones, etc. are carried with the electrical key transmitter sub-assembly.
    • The electrical key transmitter sub-assembly is covered by or in contact with a metal object.
    • A radio wave type keyless entry system or wireless remote is operated nearby.
    • The electrical key transmitter sub-assembly is placed near high-voltage equipment or equipment that emits electrical noise.

(a) The vehicle interior detection area is formed and the electrical key transmitter sub-assembly is detected when any of the following conditions are met: 1) The driver door is opened and closed, 2) the brake pedal is depressed, 3) the engine switch is operated, 4) the conditions required for various warnings are met, or 5) an entry door lock operation is performed.

(b) The vehicle interior detection area when starting the engine can be customized through a customize setting.

Click here

    How To Proceed With Troubleshooting
    CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the smart access system with push-button start (for Start Function). *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGH ...

    Operation Check
    OPERATION CHECK NOTICE: Make sure that the smart access system with push-button start (for Start Function) has not been canceled before performing this inspection. Click here OPERATION DESCRIPTION ( ...

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