WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
Connect the electrical connector to the rear seat audio.
Install the rear seat audio to the overhead entertainment console.
Press the rear seat audio until to locks into place.
Fig 1: Connecting Electrical Connector To Rear Seat Audio