Circuit/System Description
WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
The rear differential pressure sensor is used for closed-loop control of the hydraulic pressure. The sensor is a three wire circuit that consists of a 5 V reference, low reference, and signal low circuit and outputs a voltage that represents the physical pressure within the hydraulic circuit piston cavity. It also includes an integrated temperature sensor.