unplug the antenna for the xm in your trunk and it will solve your problem, mine did the exact same thing, it will say check antenna when you first start it up but then it goes away.I got to work. I couldn't use just the auxilary. I had to use the av to auxilary. When i did that And now i got it to work but it isn't working correctly. It will play music from my phone and it will play what it is receiving from the xm radio at the some time.