The 12v battery died in my 06 Prius. After batt replacement, when i press Map button on steering wheel,console reads something like CANNOT LOCATE PROGRAM. SEE DEALER. How to bring back GPS and maps.
that's weird. I would try to remove and reinsert the nav disc (under lf seat) and see if that helps before I paid the dealer to check it.
There is a reset button accessed through a small hole in the DVD player. I cannot find the original link "if it still exists", but it is there. John (Britprius)