Remote Keyless Entry (RKE) Liftgate Glass Release
WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The RKE feature provides liftgate glass release function independently of key position. The liftgate glass release button must be pressed twice within 3 seconds for the liftgate glass to release.