Theory Of Operation

The Comfort Seat Module (CSM) can also be identified as Left or Right (Comfort Seat (L/R) Front Module) provides a variable Pulse Width Modulation (PWM) signal to the Heated Seat element in each seat cushion and seat back. The CSM regulates the heated seat element temperature by monitoring a signal from the temperature sensor located within each seat heater element. As the temperature of the sensor decreases, the sensor resistance increases producing a higher voltage on the signal circuit. As the temperature of the sensor increases, the sensor resistance decreases producing a lower voltage on the signal circuit. The CSM provides a sensor ground and a low current, 5-volt signal circuit to the Temperature Sensors.