2012 suburban lt 1500 stock head unit, was listing to Sirius and all of a sudden it just quit on me, am/fm/aux and cd all work buttons all work for it, but when you go to select a Sirius station it won't let you can't even go to channel 1, subscription is good and I tried the touching the cables together nothing also tried refreshing it nothing. Also rear ac/radio unit on back of center console not working also songbird turn on and I tried too get into it with my snap on scan tool for rear ac but says no communication. fuses good, not sure if it ties in with the Sirius or not either. Anyone got a good guess?