WARNING: This page is about a different car, the 2006 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Decklid Opening Weatherstrip
Courtesy of DAIMLERCHRYSLER CORP.
Open the decklid.
Remove the decklid opening weatherstrip (2) from the decklid opening flange (1) by carefully puling outward on the weatherstrip.