Liftgate Glass Release Switch
WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
The liftgate glass release switch is a momentary contact switch that supplies a ground signal to the BCM. When the liftgate glass release switch is pressed, the signal is routed to ground, indicating a request to the BCM to release the liftgate glass latch.