I'm not sure, but I should know later this weekend as I'm installing a new headunit and aim to keep it functional.
From reading threads in the audio forum, someone mentioned that there is a mini usb molex connector in the dash near the headunit. Unfortunately there weren't any pictures, so I don't know if it's male/female or has any requirements for sizing of the outer shielding. My hope this weekend is that I plug a mini USB cable from that to the new headunit, done.
I expect to find a solution, just may take a couple days to get the right combo.
Just in case, I bought a 10 ft USB extension, that plan to route into the console.
You could rewire that from a USB charger, but it's some hacking to get to a completion stage. At least the lighter plug power is a couple feet away for easy wiring.