Liftgate Glass Release Switch
WARNING: This page is about a different car, the 2016 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.