I have sirius in my prius, but i know that xm also has head units that dont need any hook up at all,basically you buy the head unit and figure out where you want to mount it. run the supplied antenna wire however you want, put the magnetic antenna on the roof and plug the unit into a lighter plug in the car. Then you need to tune the radio and the head unit to the same radio station (they will give you options) ie; 97.9 103.5 etc. and enjoy. I have like i said a sirius and the head unit is a Blaupunkt sr-4 it works great and you dont have to tear apart the dash, or hook anything to the radio nav etc... good luck. Dean