Adding usb port to 2010 gen3

I’m assuming that you want a USB port that accesses the onboard computer, not just for charging. If so, you need to remove the existing auxiliary port/usb connector and splice the 4 existing wires (power, gnd, +data, -data). Next solder in wires that will lead to the new usb port. Personally I then either cover the solder joints with liquid electric tape, or heat shrink, or both. Then solder the other end of the new wires to the new USB port. Mount the new USB port where you want it, and reassemble any of the things you disassembled to get access to the aux port, and you should be done. It’s pretty simple. You can find instructions on disassembling your glove box for aux port removal on YouTube most likely.