SEAT WARMER SYSTEM

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

• The seat warmer system is controlled by the seat warmer control unit.

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

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

• The seat warmer control unit detects the seat warmer unit (seat cushion side) temperature by the thermistor built into the seat warmer unit.

• The seat warmer control unit maintains a constant temperature around the seat warmer unit by continually supplying power to the seat warmer unit according to the temperatures in the following table detected by the thermistor.

• 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.

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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.