I have an 08 Impala with a dash mounted sirius receiver. I've been using the aux input to listen to it. Everything had been going fine, until recently. Now the aux input rarely recognizes the Sirius receiver, and when it does, it'* only for a few seconds before switching back to the FM modulator. At first I thought it was the audio cord, so I replaced it. When that didn't work, I got a new receiver, but i am still having the same problem. Oddly enough when I disconnect the cord from the receiver, the aux automatically kicks in. Anyone have any ideas????