grom audio adds usb aux and ipod and runs off cd1 on back of oem hu.....they also have one that does bluetooth. might find used one on ebay cheaper than new. have them in tacoma, xb and mazda 323f and they work great. audio is great. up to 32gb thumb drive.....isn't 1805 the color changing 6 disc? i am running the single disc color changing hu t1806. also made a steering wheel control harness and swapped in spiral cable with connections and scored a 2006 wheel with stereo controls. Love the wheel and having st whl audio controls in my 2004. the st wheel controls also work the usb stick changing songs and between the 6 virtual discs set up on the drive. i made a thread on adding the oem st whl controls. used tc harness parts and spiral cable out of junkyard. they are not available to buy....harness between stereo and wheel.
oh yeah....just ran aux, usb leads into left hand part of glovebox to keep stuff out of sight but cables are long enough to reach driver, passenger or cupholders or top of glovebox flat area.