I got the VW unit to work with the Mazda supplied cable (from Mazda's install kit) and a Mazda DMS, but am in need of the firmware upgrade for the VW box to Mazda specs, or a way to clear the VW info from the VW DMS. I know it'll work, but will require someone more knowledgable than I to get it perfect. I'll keep you posted. If anyone has any ideas, please jump in anytime.