Shaggy, its helps if you tell us what radio and model you have. If its a Sony, then you will likely have to buy another piece of hardware to make it work. MY sony says it is XM ready, but the cost and availability of a the XM hardware makes it a non starter. Go buy a Pioneer.
2004 Newmar Kountry Star Diesel Pusher, Chevy Tracker, Kizzy, Desi,Rosie, Red Ryder and Trek our Vizsla's