i've done it!!!
here is the deal people....if you have a stereo head unit made my fujitsu???....who manufactures the stock radio and cd unit in the VX.....it will most likely work, but still needs splicing the connections....as far as the rest of the head units....it is totally hit or miss...and FROM EXPERIENCE it's mostly miss!!!! the digital reading information used by each manufacturer is different and not a standard format of information when it comes to this type of technology (not like windows on a pc etc etc....)...........good luck with it.....
bottom line is if you are looking for a head unit?...buy the units made by ECLIPSE....THEY ARE "the most" COMPATIBLE with the stock disk changer (ALMOST ALL) BUT YET STILL NOT PERFECT TO ALL DEGREES WITH SOME MODELS.

http://www.eclipse-web.com/index.html

IF ANYONE HAS OR BUYS AN ECLIPSE MODEL UNIT....I CAN FAX YOU THE DIAGRAH FOR THE WIRING BASICS......NO GAR'S IT WILL WORK FOR YOU, BUT IT SURE MIGHT HELP