WARNING: This page is about a different car, the 2005 GMC Yukon XL and 2005 GMC Yukon. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Shift Control Module Electrical Connectors
Courtesy of GENERAL MOTORS CORP.
Disconnect the shift control module electrical connectors.
Fig 2: Shift Control Module
Courtesy of GENERAL MOTORS CORP.
Unsnap and remove the shift control module from the bracket.