WARNING: This page is about a different car, the 2006 Pontiac Torrent and 2006 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
Connect the electrical connector to the heated seat module.
Fig 1: View Of Front Heated Seat Control Module
Courtesy of GENERAL MOTORS CORP.
Install the module with the retainer to the seat pan.