The 'AUX' button in the deck is actually the same hardware button as the CD button, you just keep pressing it until you get to from CD to 'AUX', just like the AM/FM button. That 'AUX' button can only be used by a GM auxiliary cassette or CD player however... (They go in the console/lower dash on some S-series trucks/full sizes)Nice. Will do soon, but can this be done for the aux button on the deck? This set up has to have a cd running, right?
But basically, any CD will do. Just insert it, make sure its not on RDM (random), and it will just play without audio while you have your AUX cable playing. There is no audio leakage once both ends of the AUX cable are connected.