i switched from the Ipod to the Sirius today and the Sirius is stuck on channel 24 but with no sound. I try to change the channel but it wont work. Then when I change back to the Ipod, its somehow muted. Ill put the volume all the way up and you can barely hear it. But if I turn the truck off then on again, the volume is restored for the ipod, but the sirius still wont work. How do I fix this??