So I replaced one radio with another, no real reason, I just thought one looked better than the other, anyway, Aux didn't work on the old stereo and obviously doesn't work with the new one. Pulled the console and verified the plug under the cup holder was connected.
I'm using an iPhone 5S, would that make a difference? The first pic is my old radio, 2nd pic is "new" radio, 3rd pic is the wiring for the radio, any idea what the one connector that goes nowhere is for? I can't figure out why Aux doesn't work, has the button on the front
of the radio, SWC all work (including mode). Mine has the iPod connector in the center console, along with the aux and power plug, but I don't have an old iPod lying around to test it. The power plug works.

 

Disregard, figured out I have to have the phone plugged in and charging before it works. Ordered me up one of those loop thingys to fix that.