HVAC Control Module
WARNING: This page is about a different car, the 2022 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.
The HVAC control module contains the heated seat control buttons. The HVAC control module monitors the seat cushion temperature sensor and supplies heater current to the seat cushion and backrest heater mats until the desired setpoint temperature is reached. Once the setpoint temperature is reached, the HVAC control module cycles the heater circuits on/off as required to maintain the setpoint temperature.