WARNING: This page is about a different car, the 2004 GMC Yukon XL and 2004 GMC Yukon. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect the shift control module electrical connectors.
Fig 1: View Of Shift Control Module Electrical Connectors
Courtesy of GENERAL MOTORS CORP.
Unsnap and remove the shift control module from the bracket.