WARNING: This page is about a different car, the 2007 Saturn Ion Red Line, 2007 Saturn Ion 3, and 2007 Saturn Ion 2. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Mirror Applique
Courtesy of GENERAL MOTORS CORP.
Remove the retaining screw from the mirror applique.
Remove the mirror applique from the roof applique by sliding the mirror applique downward.