Heated Seat Sensor: Operation

The temperature sensor is a NTC thermistor. The heated seat module supplies a five-volt current to one side of each sensor, and monitors the voltage drop through the sensor on a return circuit. When the temperature of the seat cushion cover rises, the resistance of the sensor decreases. The heated seat module uses this temperature sensor input to monitor the temperature of the seat, and regulates the current flow to the seat heating elements accordingly.