Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: System Description

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Theft Deterrent System / System Description

SYSTEM DESCRIPTION

OUTLINE OF THEFT DETERRENT SYSTEM

  • The theft deterrent system can be set/canceled by locking/unlocking the doors using any of the following operations:
    • Entry lock/unlock operation
    • Wireless lock/unlock operation*1
    • Key linked lock/unlock operation
    • Opening and closing the doors*2
      • *1: Using the remote door lock and unlock is also considered to be a wireless lock/unlock operation. (w/ Lexus Enform Remote)
      • *2: Only when setting the theft deterrent system.
  • The alarm function will be activated when someone attempts to forcibly unlock any of the doors or open any of the doors or the engine hood while the system is in the armed state.
  • In the alarm sounding state, the system illuminates the interior lights and blinks the turn signal lights and the exterior lights. At the same time, the system sounds the vehicle horns and security horn assembly*1 or theft warning siren assembly*2 to deter break-in and theft as well as to warn people around the vehicle.

    HINT:

    The interior lights is illuminated if the interior light door switch in the map light assembly is on.

    • *1: w/ Security Horn Assembly
    • *2: w/o Security Horn Assembly
  • The theft deterrent system has an active arming mode. There are 4 states in this mode; a disarmed state, an arming preparation state, an armed state and an alarm sounding state.

(a) Disarmed state:

  • The alarm function is not operating.
  • The theft deterrent system is not operating.

(b) Arming preparation state:

  • The time until the system goes into the armed state.
  • The theft deterrent system is not operating.

(c) Armed state:

  • The theft deterrent system is operating.

(d) Alarm sounding state:

  • The alarm function is operating.

Alarm time:

Approximately 57 seconds

Alarm Methods

Alarm Method
  • Exterior Lights
    • Low Beams
    • Taillights

Blinking

Turn Signal Lights

Blinking

Interior Lights

Illuminating

Vehicle Horns

Sounding

(Approximately 0.4-second cycles)

Security Horn Assembly*1

Sounding

(Approximately 0.4-second cycles)

Theft Warning Siren Assembly*2

Sounding
  • *1: w/ Security Horn Assembly
  • *2: w/o Security Horn Assembly

FUNCTION OF MAIN COMPONENTS

Component

Function

Security indicator light

Informs driver of theft deterrent system status.
  • Security horn assembly*1
  • Theft warning siren assembly*2

Sounds when attempted break-in or theft is detected.

Low beams

Blink when attempted break-in or theft is detected.

Taillights
  • Blink when attempted break-in or theft is detected.
  • Come on when theft deterrent system has entered alarm sounding state.

Turn signal lights

Blink when attempted break-in or theft is detected.

Interior lights

Comes on when attempted break-in or theft is detected.

Vehicle horns

Sound when attempted break-in or theft is detected.
  • Front door courtesy light switch assembly (for LH/RH)
  • Rear door courtesy light switch assembly (for LH/RH)
  • Back door courtesy light switch

Detects door status (open or closed).

Door unlock detection switch

Detects door status (locked or unlocked).

Engine hood courtesy switch (Hood lock assembly)

Detects engine hood status (open or closed).

Certification ECU (Smart key ECU assembly)
  • Receives wireless door lock/unlock signal.
  • Receives entry door lock/unlock signal.
  • *1: w/ Security Horn Assembly
  • *2: w/o Security Horn Assembly

ACTIVE ARMING MODE

(a) Active arming mode:

This system operates as described in the diagram below when one of the items for each condition is met.

HINT:

  • The term "all doors" used in this section refers to the driver door, front passenger door, rear door LH, rear door RH and back door.
  • Using the remote door lock and unlock is also considered to be a wireless lock/unlock operation.*
    • *: w/ Lexus Enform Remote

Condition

Item

Condition [1]

In disarmed state 1, when the engine switch is turned off, the system state is changed if the following condition is met:

  • With all doors and the engine hood closed, all doors are locked by wireless operation, the smart access system with push-button start or key linked power door lock operation.

In disarmed state 1, when the engine switch is off, the engine hood is closed and all doors are locked, the system state is changed if the following condition is met:

  • All doors are closed when any door is open.

Condition [2]
  • Approximately 30 seconds elapse.

Condition [3]
  • All doors are unlocked by wireless operation, the smart access system with push-button start or key linked power door lock operation.
  • Any door is unlocked.
  • Any door is opened.
  • The engine switch is pushed.
  • The engine switch is turned on (ACC) or on (IG). (Not using the remote start.*1)
  • The battery is reconnected.

Condition [4]
  • The engine hood is opened when it was closed.
  • The battery is reconnected while the engine hood is open or any door is unlocked.
  • Any door is opened when all doors are closed.
  • Any door is unlocked when all doors are locked.
  • When 5 seconds or more have elapsed since the engine switch is pressed, the power source mode is changed from off to on (IG) without pressing the engine switch. (Not using the remote start.*1)

Condition [5]
  • The engine switch is turned on (IG) and the engine is running at 550 rpm for 2 seconds or more.
  • All doors are unlocked by wireless operation, the smart access system with push-button start or key linked power door lock operation.
  • The engine switch is turned on (ACC) or on (IG) within 5 seconds after the engine switch is pushed. (Not using the remote start.*1)

Condition [6]
  • After approximately 27.5 seconds, the alarm stops and the system returns to the armed state.

Condition [7]
  • The back door is closed when the engine hood is closed.*2
  • The engine hood is closed when the back door is closed.*2
  • The engine hood is closed when it was open.*3

Condition [8]
  • Any door is unlocked when all doors are locked.
  • Any door is opened.
  • The power back door stops or operates in the reverse direction during a closing operation, or any of the doors are opened during a power back door closing operation.*2
  • The engine switch is pushed.
  • The engine switch is turned on (ACC) or on (IG). (Not using the remote start.*1)
  • The battery is reconnected.
  • All doors are unlocked by wireless operation, the smart access system with push-button start or key linked power door lock operation.

Condition [9]

In disarmed state 1, when the engine switch is turned off, the system state is changed if the following condition is met:

  • With all doors closed and the engine hood open, all doors are locked by wireless operation, the smart access system with push-button start or key linked power door lock operation.

In disarmed state 1, when the engine switch is off, the engine hood is open and all doors are locked, the system state is changed if the following condition is met:

  • All doors are closed when any door is open.

Condition [10]
  • The engine hood is opened.
  • *1: w/ Lexus Enform Remote
  • *2: w/ Wireless Reservation Power Back Door Lock Function
  • *3: w/o Wireless Reservation Power Back Door Lock Function

FORCED DOOR LOCK CONTROL

(a) The forced door lock control prevents the vehicle from being tampered with. Immediately after a door is unlocked (armed state), all doors are forced to lock by a forced door lock signal.

(1) If the following conditions are met, the forced door lock control is operated.

  • The theft deterrent system is in the armed state.
  • Any door is unlocked.

ALARM MEMORY FUNCTION

(a) If the alarm is set off (tampering is detected) while the theft deterrent system is in the armed state, it will be stored by the alarm memory function. Whenever the theft deterrent system is canceled, the alarm memory function causes the taillights to light up for 2 seconds in order to inform the user that the alarm has been set off.

(1) Condition that cause the taillights to light up for 2 seconds:

The theft deterrent system has entered the alarm sounding state (tampering has been detected) at least once.

HINT:

Active arming mode: See Active Arming Mode.

PANIC ALARM CONTROL

(a) Panic alarm control makes it possible to voluntarily set off the panic alarm by pressing the panic switch on the electrical key transmitter sub-assembly.

(1) Conditions that cause panic alarm control to set off the panic alarm:

The panic switch on the electrical key transmitter sub-assembly is pressed under the following conditions:

  • The engine switch is off.
  • The theft deterrent system is not in the alarm sounding state.

(2) Conditions that cause the panic alarm control to shut off the alarm:

Any of the following conditions is met during panic alarm control operation:

  • The engine switch is turned on (IG).
  • The panic switch is pressed again.
  • Any of the switches on the electrical key transmitter sub-assembly (lock/unlock/power back door open) is pressed.
  • The panic alarm ends (approximately 57 seconds have elapsed).
  • The theft deterrent system switches to the alarm sounding state. Under this condition, the theft deterrent system controls the alarm rather than the panic alarm control. In order to cancel this alarm, refer to the theft deterrent system alarm sounding state cancellation procedure.

THEFT WARNING SIREN ASSEMBLY (w/o Security Horn Assembly)

(a) The theft warning siren assembly has an internal battery. If power to the theft warning siren assembly is interrupted or the communication line is open, the theft warning siren assembly detects it and sounds the alarm using the internal battery.

(b) The theft warning siren assembly has the following alarm controls: normal alarm control and open circuit alarm control. Under normal alarm control, the alarm sounds based on instructions from the main body ECU (multiplex network body ECU) whereas under open circuit alarm control, the theft warning siren assembly judges current security conditions and sounds the alarm by itself.

(1) Normal alarm control

The theft warning siren assembly sounds when the theft deterrent system is in the alarm sounding state and does not sound when the system is not in the alarm sounding state.

HINT:

If the communication between the theft warning siren assembly and main body ECU (multiplex network body ECU) is continuously interrupted for 70 seconds or more while the theft deterrent system is in the alarm sounding state, the theft warning siren assembly will stop sounding.

(2) Open circuit alarm control

The theft warning siren assembly changes between the disarmed state and armed state in accordance with the change of the theft deterrent system between the disarmed state and armed state. If the power source, ground or communication line becomes open while the theft warning siren assembly is in the armed state, the theft warning siren assembly will sound.

During the open circuit alarm sounding state, the theft warning siren assembly sounds intermittently for 27.5 seconds and then stops for 5 seconds. This pattern repeats a maximum of 9 times.

This intermittent sounding will stop when either of the following conditions is met:

1. The theft warning siren assembly changes to the disarmed state.

2. The circuit returns to normal.

SECURITY INDICATOR LIGHT OUTPUT

(a) According to the state of the theft deterrent system, the main body ECU (multiplex network body ECU) outputs a signal to turn the security indicator light on. However, some of the actual lighting conditions of the security indicator light are different from the output signals of the main body ECU (multiplex network body ECU).

Output

State of Theft Deterrent System

Security Indicator Light

Output Signal from Main Body ECU (Multiplex Network Body ECU)

Actual Lighting Condition

Disarmed state (1), (2)

Off
  • Off (Immobiliser system unset)
  • Blinking (Immobiliser system set)

Arming preparation state

On

On

Armed state

Off

Blinking

Alarm sounding state

On

On
Blinking Cycle

Time

Security Indicator Light

0.125 sec.

On

1.875 sec.

Off

HINT:

When the immobiliser system is set, the security indicator light blinks during both the disarmed state and the armed state due to output signals from the immobiliser system.

    System Diagram
    SYSTEM DIAGRAM ...

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