WARNING: This page is about a different car, the 2004 Buick Regal and 2004 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Removing/Installing DLC & Screws
Courtesy of GENERAL MOTORS CORP.
Remove the screws from the data link connector.
Reposition the data link connector from the instrument panel.