Heated Seat Sensor: Operation
WARNING: This page is about a different car, the 2003 Dodge Intrepid, 2003 Chrysler Intrepid, 2003 Chrysler Concorde, and 2003 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
When the temperature of the heated seat element rises, the resistance of the heated seat sensor decreases. The memory heated seat/mirror module supplies five volts to one side of each sensor, and monitors the voltage drop through the sensor on a return circuit. The module uses this temperature sensor input to monitor the temperature of the seat, and regulates the current flow to the seat heating elements accordingly.