Here's a look at the connector on the back of the radios:
The aux connector goes in the top row to the far left. The pins right next to it (middle six) look exactly the same - is it possible to run a second aux jack there and would the radio know what to do with it if you could?
I'm not sure about factory radio, but on my Pioneer a have two AUX IN.
One is regular, and second AUX IN connected thru CDRB-10 IP-Bus adapter.
One of the inputs is soldered to the factory AUX jack in the glove box, and second is connected permanently to my portable XM radio Dock.
nope. the plugs on the back of the smarts are from vw's. the only aux is the yellow plug. the other 2 plug colors would be blue and green. one is for a changer and i forgot what the green one was. only seen all 3 plugs on vw's audi's.