Liftgate Release Switch
WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The exterior power liftgate switch is a momentary contact switch that supplies a ground signal to the RFA module.
When the exterior liftgate switch is pressed, the RFA module activates the power liftgate Intelligent Access (IA) feature.