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Home › Lexus › 2005 › SC 430 › Repair and Diagnosis › Body & Frame › Door Locks › Theft Deterrent System - Diagnostics › System Description

System Description

  1. THEFT DETERRENT SYSTEM DESCRIPTION 

    The theft deterrent system is designed to deter vehicle break-ins and theft. If an attempted break-in or theft is detected, a vehicle horn and security horn will sound; room lamps will illuminate; and hazard warning lamps, taillamps and headlamps will begin flashing. The system uses these cues to detect an attempted break-in or theft: 1) vehicle is forcibly entered, 2) engine hood is forcibly opened, 3) doors are unlocked without the use of a key, or 4) the cable from the negative (-) battery terminal is disconnected and then reconnected.

    If the system enters the alarm sounding state, any unlocked doors will automatically lock. The system has 2 modes: active arming mode (see On-Vehicle Inspection, step  2) and passive arming mode (see On-Vehicle Inspection, step  3). Passive arming mode can be toggled ON and OFF (see On-Vehicle Inspection, step  4).

    Each mode has 4 states: disarmed state, arming preparation state, armed state and alarm sounding state.

  2. FUNCTION OF MAIN COMPONENT 
    FUNCTION OF MAIN COMPONENT

    Function Outline
    Security indicator Informs driver of theft deterrent system status
    Security horn Sounds when attempted break-in or theft is detected
    Headlamp Headlamp begins flashing when attempted break-in or theft is detected
    Taillamp Taillamp begins flashing when attempted break-in or theft is detected
    Map lamp Map lamp begins flashing when attempted break-in or theft is detected
    Hazard warning lamp Hazard warning lamp begins flashing when attempted break-in or theft is detected
    Vehicle horns Sounds when attempted break-in or theft is detected
    Door courtesy lamp switch Detects door open status (open or closed)
    Door lock position switch Detects door lock status (locked or unlocked)
    Engine hood courtesy switch Detects engine hood open status (open or closed)
    Luggage courtesy switch Detects luggage compartment door open status (open or closed)
    Unlock warning switch Turns on when key is inserted into ignition key cylinder and turns off when no key is inserted into ignition key cylinder
  3. SYSTEM FUNCTION 
    1. Disarmed state:
      • The alarm function is not operating.
      • The theft deterrent system is not operating.
    2. Arming preparation 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 (60 +/- 5 seconds).
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