WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Release the defroster grille (2) retainers using a small flat-bladed tool.
Remove the grille (2) from the instrument panel (I/P) upper trim pad (1).
Fig 1: Removing Grille From Instrument Panel (I/P) Upper Trim Pad (Pontiac)