If you have the XM radio connected, it won't work. The radio is capable of using the XM radio. This Phatnoise system plugs in to where the XM box plugs in. You can't have both from what I've been told.

 

I was disappointed as well when I got an Iphone haha, Shopped around and got grom audio ipod box. It hooks up to your stock radio, very easy install btw and plays your songs and also charges your iphone. You can use your wheel controls as well to skip songs etc. Their customer service was great as well when I needed a cord replaced.