SEAT WARMER SYSTEM

• The seat warmer system warms the front seat cushion and front seat back using the seat warmer unit.

• The seat warmer unit warms the seat cushion and seat back by supplying power to the built-in filaments.

• The seat warmer unit can adjust the temperature between 3 levels.

• The temperature level of the seat warmer unit changes each time the seat warmer switch is pressed.

am3uun00003306

• The seat warmer control unit supplies power to the seat warmer unit and increases the temperature around the seat back and seat cushion up to the average temperature which is applied to the temperature level.

Switch display	Temperature level	Average temperature around seat warmer unit
Switch display	Temperature level	Seat cushion side	Seat back side
	0	—
	3	Approx. 42 °C {108 °F}	Approx. 47 °C {117 °F}
	2	Approx. 40 °C {104 °F}	Approx. 42 °C {108 °F}
	1	Approx. 37 °C {99 °F}

• The seat warmer control unit detects:

• When the seat warmer control unit detects that the average temperature around the seat warmer unit (seat cushion side) has decreased below the specified temperature based on a signal from the thermostat, power is supplied to the seat warmer unit again to increase the temperature up to the specified temperature.

Temperature level	Average temperature around seat warmer unit (seat cushion side)
	Cloth type		Leather type
	Increase start temperature	Decrease start temperature	Increase start temperature	Decrease start temperature
0	—
3	Approx. 40 °C {104 °F}	Approx. 42 °C {108 °F}	Approx. 50 °C {122 °F}	Approx. 52 °C {126 °F}
2	Approx. 28 °C {82 °F}	Approx. 30 °C {86 °F}	Approx. 32 °C {90 °F}	Approx. 34 °C {93 °F}
1	Approx. 20 °C {68 °F}	Approx. 22 °C {72 °F}	Approx. 20 °C {68 °F}	Approx. 22 °C {72 °F}

• The seat warmer control unit maintains a constant average temperature around the seat warmer unit by continuing to supply power to the seat warmer unit.

• The seat warmer switch is built into the indicator unit.

• The seat warmer unit is sewed into the front seat back trim and the front seat cushion trim.

• The seat warmer control unit is located on the bottom of the passenger-side front seat.

am3uun00003311

1. The indicator unit determines (1) the average increase temperature of the seat warmer unit by operating the seat warmer switch (driver-side).

2. The indicator unit sends (2) the temperature level "3" signal for the seat warmer unit to the CPU of the seat warmer control unit.

3. When the CPU of the seat warmer control unit receives the operation level "3" signal from the indicator unit, it supplies the base current to the transistor built into the seat warmer control unit (3), and the gate voltage is applied to the FET simultaneously (4).

4. If the base current is supplied, the transistor supplies collector current to the relay coil (5).

5. If collector current is supplied, the relay coil energizes and turns on the relay switch (6).

6. When the gate voltage is applied, the FET completes the circuit between seat warmer control unit terminal A and ground (7).

7. When the relay switch built into the seat warmer control unit turns on and the FET circuit is completed, the driver-side seat warmer unit circuit is completed (8) and the driver-side front seat cushion and seat back warm up.