[subunix]

You would need to pull out your head unit and see what connections you have, and compare it to the nav unit, i just know when an option isnt ordered from the factory you usaully dont have the required electrical connections. Im thinking if it doesnt work right away you might need a new xm module, possibly onstar module. Ive also been told its a lot easier to just do an aftermarket, but of course if you get deal of the century you can make it happen