I can't for the life of me figure out how to use this AUX cord. I'm thinking it might be busted. It's just a simple black aux cord coming straight out of the bottom of the center console. I've tried every source: cd, fm/am stations etc. I've pulled out the back of the radio to check for loose connections and nothing. I've checked in the back by the dvd nav unit and found nothing. although, is it possible that it's plugged into the back of the dvd nav unit somehow? Anything else I should try or is it a loss?