AIR CONDITIONING SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Combination Meter Assembly Sends the passenger side occupant detection signal to the air conditioning amplifier assembly.
    Air Conditioning Amplifier Assembly

    • Receives various information, sets a seat heater level*1 or climate control seat level appropriate for the target outlet temperature and controls the seat heater system*1 and climate control seat system.

    • Receives various information, sets a steering wheel heater level appropriate for the target outlet temperature and sends it to the steering wheel heater control assembly.*2
    Ambient Temperature Sensor (Thermistor Assembly) Detects the ambient temperature and outputs it to the air conditioning amplifier assembly.
    Integration Control and Panel Assembly Allows operation and adjustment of the air conditioning via switches.
    Multi-display Displays the settings screen.
    Radio Receiver Assembly Sends function customization information from the multi-display setting screen to the air conditioning amplifier assembly.
    Room Temperature Sensor (Cooler Thermistor Assembly) Detects the internal temperature inside the cabin and outputs that data to the air conditioning amplifier assembly.
    Steering Wheel Heater Control Assembly*2 Controls the steering wheel heater according to the steering wheel level received from the air conditioning amplifier assembly.

    *1: Models with seat heater system

    *2: Models with steering wheel heater system

  2. SYSTEM CONTROL


    1. Seat Heater System (Models with Seat Heater System) and Climate Control Seat System Operation


      1. With Lexus Climate Concierge control, the seat heater level*1 and climate control seat level are changed in steps based on the ambient temperature and target output temperature for the driver side and front passenger side so that the levels are optimized constantly.

      2. Lexus Climate Concierge control is performed in 9 steps: 5 steps for the seat heater level (Lo1, Lo2, Medium1, Medium2 and Hi)*1, 3 steps for the climate control seat system and 1 step for OFF.

      3. For the front passenger side, the seat heater system*1 and climate control seat system perform automatic operations when a passenger is detected by the occupant detection system. The seat heater*1 system and climate control seat system stop the AUTO operation when the occupant detection system judges that there is no passenger in the front passenger seat. The AUTO operation is resumed when the occupant detection system is operated again and judges that there is a passenger.*2

        Tech Tips

        *1: Models with seat heater system

        *2: Occupant detection system is not performed if the seat heater system and climate control seat system perform automatic operations with the AUTO switch on the SEAT/STEERING screen.

        A004DL9E03

    2. Steering Wheel Heater System Operation (Models with Steering Wheel Heater System)


      1. With Lexus Climate Concierge control, the steering wheel heater level is changed in steps based on the ambient temperature and target output temperature of the driver side so that the level is optimized constantly.

      2. Lexus Climate Concierge control adjusts the steering wheel heater level in 3 steps (Hi, Lo and OFF).

        A004DEAE02

  3. FUNCTION


    1. When the air conditioning system, seat heater system*1, climate control seat system and steering wheel heater system*2 are operating in AUTO mode, the air conditioning amplifier assembly comprehensively controls the systems to achieve a comfortable space in the cabin.

    2. When the system is in heater mode, the air conditioning amplifier assembly operates the seat heater system*1 and steering wheel heater system*2, and when the system is in cooler mode, the air conditioning amplifier assembly operates the climate control seat system. The air conditioning amplifier assembly operates the systems according to the ambient temperature and cabin temperature. Also, the seat heater system*1 and climate control seat system are combined to reduce the load on the air conditioning system, improving fuel economy without sacrificing passenger comfort.

    3. A Lexus Climate Concierge monitor is used, making it possible to check the operation conditions of the air conditioning system, seat heater system*1, climate control seat system and steering wheel heater system*2.

    4. A Lexus Climate Concierge switch is positioned on the Lexus Climate Concierge monitor and used to make it possible to set the air conditioning system, seat heater system*1, climate control seat system and steering wheel heater system*2 to AUTO mode*3 all at once.

      Tech Tips

      *1: Models with seat heater system

      *2: Models with steering wheel heater system

      *3: AUTO mode can be set individually for each system.

      Figure 1. Lexus Climate Concierge Monitor

      A004DILC01
      *1 Lexus Climate Concierge (LCC) Switch - -
      *a The illustration shown are example only. - -

      Figure 2. Option Display

      A004DS7C02
      *1 Lexus Climate Concierge (LCC) Switch - -
      *a The illustration shown are example only. - -