SEAT HEATER SYSTEM DETAILS

FUNCTION OF MAIN COMPONENTS

1. The main components in the rear seat heater system have the following functions:

   Component	Outline
   Seat Heater	Sewn into the internal surfaces of the seat cushion and the seat back, and warms up the seat surfaces using the heat caused by electrical resistance.
   Rear Climate Control ECU Assembly	Controls the system based on signals from the seat heater sensor and the seat heater switch.
   Air Conditioning Amplifier Assembly	Sends ambient temperature and air conditioning temperature signals to the climate control ECU assembly.
   Rear Power Seat Switch - Rear Seat Heater Switch LH - Rear Seat Heater Switch RH	The operation signals of the rear seat heater switch are input into the climate control ECU assembly in order to adjust the seat heater temperature.
   Seat Heater Sensor	Detects the surface temperature of the seat cushion.

OPERATING CONDITION

1. When all of the following conditions are met, the quick seat heater control operates after the power switch is turned on (IG):

   Condition
   1 second or more has elapsed since the power switch was turned on (IG). The ambient temperature is 20°C (68°F) or less. The temperature of the seat surface is 20°C (68°F) or less. The seat heater system has been set to the manual control by using the seat heater switch or by automatic control.

2. When any one of the following conditions is met, the quick seat heater control is canceled and the seat heater system operates normally:

   
   

   • Except when the seat heater system has been set to the manual control using the rear seat heater switch or by automatic control.

   • When the quick seat heater control reaches the end of its timer*1 sequence.

   • When the temperature of the seat surface increases to a certain degree as shown in the following table:

     Seat Heater System Control*2		Temperature of Seat Surface
     Manual	Automatic	-5°C (23°F) or Less*3	Between -4°C (25°F) and 10°C (50°F)*3	11°C (52°F) or More*3
     Max	Max	50°C (122°F)	47°C (113°F)	40°C (104°F)
     -	Mid3	48°C (118°F)	43°C (109°F)	38°C (100°F)
     Mid	Mid2	45°C (113°F)	40°C (104°F)	35°C (95°F)
     -	Mid1	42°C (108°F)	37°C (99°F)	32°C (90°F)
     Min	Min	40°C (104°F)	35°C (95°F)	30°C (90°F)

     Tech Tips

     *1: The settings of the timer can be customized. For details on customization, refer to the Repair Manual.

     *2: Operation conditions of the seat heater system while the quick seat heater control is in operation

     *3: Temperature of the seat surface while the quick seat heater control is in operation

FUNCTION

1. The following functions are used for the seat heater system:

   Component	Outline
   Automatic Control	Automatically adjusts the temperature of the seat heater in 6 stages (off, min, mid 1, mid 2, mid 3 and max) in accordance with the ambient temperature, the rear seat air conditioning target airflow temperature, the time elapsed after the power switch is turned on (IG), etc., when the automatic switch is on.
   Quick Seat Heater Control	Temporarily increases the power of the seat heater in accordance with the ambient temperature, seat surface temperature, etc., after the power switch is turned on (IG), and quickly warms the seat heater. Once the timer reaches 180 seconds, this control operates normally.*

   Tech Tips

   *: The settings of the timer can be customized. For details on customization, refer to the Repair Manual.

CONSTRUCTION