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I just did an install of a Metra kit on an RX300. This has the capability to include backup camera, navigation, and of course the climate control is also included. The deftails are in this video. We went with Metra because it is a known name in this space - not some AliBaba special. They produce similar kits for other Lexus vehicles with similar setup of climate control/navigation/stereo.

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.