System Block Diagram
WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
The base grade regulator (driver's and passenger's seats) or the regulator for other than the base grade (all seats) is equipped with a control module that controls the operational speed. It is connected with the body integrated unit via LIN communication. Operation is performed using individual switches. Only the seat equipped with the control module uses PLS signals of motor for auto-reversing and controlling operational speed.
NOTE:
The following diagram varies depending on the equipment and grades.