Theory Of Operation
WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The Anti-lock Brake System (ABS) Module monitors the Normally Open and Normally Closed Brake Switch status from the Body Control Module (BCM) over the CAN BUS. The Normally Open switch should always activate before the Normally Closed switch.