iPod Connection Stopped Working

[Gasser]

Without warning, the iPod connection in my X1 stopped working. The iPod itself is still working fine on its own and connects in my wife's car through the USB, and her iPhone works in the X1 using the USB, so I can't figure out where the breakdown is occurring. The car display recognizes that the USB connection has been made to the iPod, but is otherwise completely unresponsive. Can anyone recommend a solution?