Theory Of Operation
WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Heated Seat Module (HSM) provides a variable Pulse Width Modulation (PWM) signal to the Heated Seat element in each seat cushion and seat back. The HSM provides a power and return to a thermistor in order to monitor and regulate Heated Seat element function.