PIONEERSUBY was last active on this forum on Aug 24 2014 so I doubt that he will see your request.I doubt that an OEM navigation system from 2002 would be desirable since annual map updates for the generation 2/3 system were discontinued in 2013.
IMO, a portable GPS unit like a Garmin provides better navigation and Bluetooth hands free phone that even the newest Toyota/Lexus systems.
If you really want an in-dash nav, aftermarket is the way to go but it will cost far more than a portable Garmin.
I agree that an aftermarket solution would probably be better. The thing I can't get past is that this RX300 I just bought (2002, 65K miles and miiiiiiiiiiiiiiiiint) is so pretty. I hate to sully it up with an aftermarket GPS. That being said, it might be my only choice.