Xm radio I just bought a 2007 Hyundai Sonata with factory installed XM. When I hit the XM button it says "XM Loading". But it doesn't do anything else. I called XM and they don't know what to tell me. I am trying to subscribe to the service but without the radio ID I can't.

It might be the signal is out of range gotta love xm signals once detects the signal things should go back to norm
find xm antenna try to follow back to unit see if it just came loose from bumping it

a good reset way is disconnect from power let set for a minute or 2 and then plug back in

radio id should be xm compliant the sterio your using to push the sound you need that id

We had the same problem with our 2007 sonata, it is actually hapening again now. We took it to the dealer the fist time and they had to repace the xm unit (under car somewhere) apparently when it rains really hard the unit gets wet. I guess we have to take ours back again, it started acting up again after a recent rain.