Hey Im sure this has been done before but I figured I'd post a pic of what I did in case anyone is wondering how to keep their stock USB and AUX but be able to use them with an aftermarket HU. All I did was desolder the stock connectors from the circuit board and add a couple male connectors so that they'll plug into the HUs cable. I am using this with a Pioneer AVIC-X940bt and it works great. The best part for me is that if I want to return everything back to stock I can simply solder the stock connectors back in and be good to go. Let me know if you have any questions.