Sirius - No Audio

[welsh dragon]

I have a 2007 Explorer w/ factory radio w/ sirus w/o nav. Worked fine until one day the radio didn't even let me change the input to SAT. I turned off the car and turned it back on and everything worked fine.
Yesterday when I was driving I switched to SAT and the display made it look like everything was fine, however I had no audio. I have perfect audio on all other inputs.
Any suggestions or known issues with this?
Thanks.

 

[Infinity08]

Deep behind the passenger side kickpanel is the factory Sirius tuner. Check connections (especially the antenna, the connector is ****). Otherwise, sounds like the tuner went **** up (went through 2 Ford and 2 DEI-made Kenwood units on my 2008).