Selectable Drive Modes (SDM)
WARNING: This page is about a different car, the 2023 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
The driver can select system modes using the (SDM) rotary dial. When a mode is selected, the VDM regulates the PWM signal to the valve solenoids to keep the suspension "feel" relational to the selected mode.