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Home >> Lexus >> 2017 >> RC 350 Base, RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Theft Deterrent System - Diagnostics & Circuit Tests >> Theft Deterrent System >> System Description [09/2014 - 11/2017] >> System Description [09/2014 - 11/2017]
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System Description [09/2014 - 11/2017]

  1. OUTLINE OF THEFT DETERRENT SYSTEM 
    • The theft deterrent system can be set/canceled by locking/unlocking the doors performing any of the following operation:
      • Entry lock/unlock operation
      • Wireless lock/unlock operation*1
      • Key linked lock/unlock operation
      • Opening and closing the doors*2
        1. *1: Using the remote door lock and unlock is also considered to be a wireless lock/unlock operation. (w/ Lexus Enform Remote)
        2. *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, the engine hood or luggage compartment door 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. *1: w/ Security Horn Assembly
      2. *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.
    1. Disarmed state:
      • The alarm function is not operating.
      • The theft deterrent system is not operating.
    2. Arming preparation state:
      • The time until the system goes into the armed state.
      • The theft deterrent system is not operating.
    3. Armed state:
      • The theft deterrent system is operating.
    4. Alarm sounding state:
      • The alarm function is operating.

      Alarm time

      Approx. 57 seconds

      ALARM METHODS AND TIME

      Alarm Method
      1. Exterior Lights
        • Low Beams
        • Clearance Lights
        • Taillights
      		 Blinking
      Turn Signal Lights Blinking
      Interior Lights Illuminating
      Vehicle Horns Sounding
      (approx. 0.4-second cycles)
      Security Horn Assembly*1 Sounding
      (approx. 0.4-second cycles)
      Theft Warning Siren Assembly*2 Sounding
      Alarm Time Approx. 57 seconds
      1. *1: w/ Security Horn Assembly
      2. *2: w/o Security Horn Assembly
  2. 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
    • Clearance lights
    		 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) 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).
    Luggage compartment door lock assembly Detects luggage compartment door status (open or closed).
    Door unlock switch sub-assembly Detects luggage compartment door lock key cylinder status (unlocked).
    Certification ECU (Smart key ECU assembly)
    • Receives wireless door lock/unlock signal.
    • Receives entry door lock/unlock signal.
    1. *1: w/ Security Horn Assembly
    2. *2: w/o Security Horn Assembly
  3. ACTIVE ARMING MODE 
    1. 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 appropriate service information refers to the driver door and front passenger door.
      • Using the remote door lock and unlock is also considered to be a wireless lock/unlock operation.*
        1. *: w/ Lexus Enform Remote
      GTY318862Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Condition Item
      Condition [1] In disarmed state 1, when the engine switch is turned off, the system state is switched if the following condition is met:
      • With all doors, the engine hood and luggage compartment door 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 turned off, the engine hood and luggage compartment door are closed and all doors are locked, the system state is switched if the following condition is met:

      • All doors are closed when any door is opened.
      Condition [2]
      • Allow approx. 30 seconds to 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.*)
      • The battery is reconnected.
      Condition [4]
      • The engine hood is opened when the engine hood is closed.
      • The luggage compartment door is opened when the luggage compartment door is closed.
      • The battery is reconnected.
      • 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.*)
      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.*)
      Condition [6]
      • After approx. 57 seconds, the alarm stops and the system returns to the armed state.
      Condition [7]
      • The luggage compartment door is opened by wireless operation, the smart access system with push-button start or key linked power door lock operation.
      Condition [8]
      • The luggage compartment door is closed when the engine hood is closed.
      • The engine hood is closed when the luggage compartment door is closed.
      Condition [9]
      • Any door is unlocked when all doors are locked.
      • Any door is opened.
      • The engine switch is pushed.
      • The engine switch is turned on (ACC) or on (IG). (Not using the remote start.*)
      • 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 [10] In disarmed state 1, when the engine switch is turned off, the system state is switched if the following condition is met:
      • With all doors closed and the engine hood and the luggage compartment door 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 turned off, the engine hood and luggage compartment door are open and all doors are locked, the system state is switched if the following condition is met:

      • All doors are closed when any door is opened.
      Condition [11]
      • The engine hood is opened.
      • The luggage compartment door is opened.
      • The luggage compartment door is opened by wireless operation, the smart access system with push-button start or key linked power door lock operation.
      1. *: w/ Lexus Enform Remote
  4. FORCED DOOR LOCK CONTROL 
    1. 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.
  5. ALARM MEMORY FUNCTION 
    1. 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.

  6. PANIC ALARM CONTROL 
    1. 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/luggage open) is pressed.
        • The panic alarm ends (approx. 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.
  7. THEFT WARNING SIREN ASSEMBLY (w/o Security Horn Assembly) 
    1. 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.
    2. 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 communication interruption between the theft warning siren assembly and main body ECU (multiplex network body ECU) continues for 70 seconds or more while the theft deterrent system is in the alarm sounding state, the theft warning siren assembly stops sounding.

      2. Open circuit alarm control

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

        GTY503298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        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.

        The intermittent sounding will stop when either condition is met:

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

        2. The open circuit is returned to normal.

        GTY458499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. SECURITY INDICATOR LIGHT OUTPUT 
    1. 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.

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