Heated Wiper Park Overview
WARNING: This page is about a different car, the 2018 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
When the rear window defrost button (integral to the FCIM) is pressed, the FCIM activates the heated wiper park relay (located in the BJB). When the heated wiper park relay is active, the heated wiper park grids are energized.