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System Description
 
 
SYSTEM DIAGRAM
ComponentFunction
A/C amp.A/C amp. receives the switch operation signals transmitted from the A/C switch assembly via LIN communication and transmits the switch operation signals to the seat heater via LIN communication.
Seat heaterRefer to Seat Heater.
A/C switch assembly (front seat heater switch)
  • Front seat heater switch is integrated in the A/C switch assembly and is used to activate/deactivate the driver's seat and passenger seat heaters and set the temperature (Low, Mid, or High).
  • A/C switch assembly receives a switch indicator signal, it illuminates the indicator light on the front seat heater switch or rear seat heater switch.
Rear seat heater switchRear seat heater switch is used to activate/deactivate the rear seat heaters and set the temperature (Low, Mid, or High).
 
 
DESCRIPTION
  • Heated seat system is activated by seat heater switch while engine is running.
  • The seat heater temperature can be adjusted at 3 levels (Low, Mid, High) respective to the heating function by operating the seat heater switch.
  • The operation status of the heated seat system can be checked by checking the indicators of the seat heater switch.
 
 
OPERATION DESCRIPTION
  • When the front seat heater switch is operated, the A/C switch assembly recognizes switch operation.
  • When the rear seat heater switch is operated, the A/C switch assembly receives a switch operation signal from rear seat heater switch.
  • The A/C switch assembly transmits a switch operation signal to A/C amp. via LIN communication.
  • When A/C amp. receives a switch operation signal, it operates the heated seat system.
  • A/C amp. operates the heated seat system and simultaneously sends the switch indicator signal to the A/C switch assembly via LIN communication.
  • When the A/C switch assembly receives a switch indicator signal, it illuminates the indicator light on the seat heater switch.
 
 
Heating Control
  • The seat cushion heater is integrated with the heat sensor that detect the seat temperature. The heat sensor transmit the seat temperature as the heat sensor signal to CPU integrated with the seat cushion heater.
  • The CPU recognizes the seat temperature from heat sensor signal. It adjusts the seat temperature by stopping operation when the seat temperature reaches the operation stop temperature , and starting operation when the seat temperature reaches the operation start temperature .
    Preset temperatureTemperature °C (°F)
    Temperature at operation stopTemperature at operation start
    Low38.5 (101.3)35.5 (95.9)
    Mid 40.5 (104.9)37.5 (99.5)
    High42.5 (108.5)39.5 (103.1)