lexusaudio

no not the screen the navigation computer in the trunk ,it is the computers part number
that will tell which generation you have. if the 2003 3rd genration computer broke under warranty they could have replaced it with a 4th generation computer.

OneOfOne

as someone said earlier., just go to sewell lexus [lexus-parts.com] and they will hook you up. I took advantage of the sale earlier and mine is an 01 too.