my family got use harrier also recond japan.. manual is in japanese.. as well as da LCD language including aircond control n buttons.. we juz do trial n error. after few months, used to it already.

however, u can always change to new head unit. i think alphard HU can be easily changed compared to harrier..

yeah, there r lots of functions. but does it includes air cond control? if got ac control, i think u cannot change. if for ICE only, u can get aftermarket 2din HU. Can also get those wiv malaysian gps.. try n search in mudah.my, i think i came across alphard replacement HU (english)