People with the stock 6 disc radio, Turn your radio to Line In and without any cable connected to the Aux input, turn the volume up all the way or just shy of max. Can you hear a faint radio station or strange interference noises?
I can. I hear a radio station that my radio is not tuned to. Strange.
Berry - I expected you to see some other responses. My stock is gone also, but I do remember that when I added the PIE adapter - when it was not playing, there was a lot of feedback and tuning of other stations. I think that they just have so many things crammed in to that little box, there is overlap. Kind of like when I use to do car audio - we tried to run power down one side and audio down the other. That was well before tv's and navigation in cars though.
I just tried this, and all I hear is static at Max volume. Nothing that sounded like a station or anything. I have the factory 6 disc/Sirius system in my '07 XLT. I did this while the truck was off though, is yours on while making the noise?