I've never owned a sedan, but on my wagon I just push the button on the door and it just cycles, and then I go out back to pop the latch/open it.
Is the sedan different? are you expecting it to open on its own?
Is the mechanism not working at all? Have you tried just lubing up the parts with some grease?
2008 9-5 Aero-1995 900T 'vert