In the back of the car you'll see a cubby door on the left, pull it down and out and you'll find the jack. If you look closer you'll see a shiny box with 3 plugs going into it, the far right ones (white) are what you're looking for. This is the OnStar module... simply pull the plugs out and plug them into your Bluestar 2010 and you're ready to pair your phone.
Took me 5 minutes including the time it took to open the box, by far the easiest install I've ever done.