RAM 2500 Truck 4WD V8-5.7L VIN D (2005)
Seat Heater Sensor: Description and Operation
The heated seat temperature sensor is a Negative Temperature Coefficient (NTC) thermistor. One temperature sensor is used for each seat. This
temperature sensor is located in the seat cushion heating element on all models.
The heated seat temperature sensor cannot be repaired or adjusted and must be replaced if inoperative. The heated seat temperature sensor is part of the
heated seat cushion element and must be replaced as an assembly.
When the temperature of the seat cushion cover rises, the resistance of the sensor decreases. The heated seat module supplies five-volts to one side of
each sensor, and monitors the voltage drop through the sensor on a return circuit. 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.
