this is not possible as there is not any AUX connections on the back of the radio. The only AUX input is on the front of the radio. The way Uconnect sends the AUX audio signals to the radio is that it sends a CAN signal for the radio to go into an AUX mode then Uconnect sends an analog audio signal to that AUX input. So you would need to build a CAN simulator that would send the message to the radio. Basically a no go for the way you want to do it.
Originally Posted by Nicky-D
I would prefer to just add an extra AUX and an Extra 12V plug in to the upper dash. This would allow me to solve a ton of problems. I am really wondering if there is a way I can tie in to the AUX port from behind the dash to possibly split it off and run it up in to the upper dash cleanly. Adding a hidden 12V plug should be the easy part. I just hate all the dang wires plugged in to the front of dash.