AH! I also have a Japanese Prius - a late 2005 version. It has a Japanese parking sensor system, which speaks Japanese at me when I'm getting close to something. It says something like "Diddy mya des" when a meter or so away, and "Ho Ho Des! (with a sense of urgency), when getting quite close. There are other warnings as well, but I've never asked any Japanese speaking person what any of these warnings actually mean.
