With Intelligent Access
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.
When the exterior liftgate switch is pressed, the RFA module activates the power liftgate Intelligent Access (IA) feature. If the conditions allow, the RFA module sends a signal over the MS-CAN to the LTM which opens the liftgate.