I hope this isn't a really stupid question. The 2009 comes "pre-wired" for satellite radio and the stereo system has a button that says SAT. I thought this means that all I have to do is subscribe for satellite service and that the hardware is already in the car. Is that right? I called Sirius and was told I needed to give them an ESN number and to get it I should tune in to channel "0". When hit the SAT button though, nothing happens. The radio stays on the FM channel. Am I being stupid and I actually still need to buy a satellite radio? If so, what does "pre-wired satellite ready" even mean? Any suggestions for how to make this happen? Thanks.