Actually it is one of the easiest nav installs there is. And it is all plug and play.
Greetings dcfish, saw this conversation, I have a 98 ES300 in great condition, looking to keep a while longer, and VERY interested in this. I can get a 2002 Nav unit, but am unclear about what else I need to do. Can you provide me with any information. Your reply stated it was "plug and play." Any info is appreciated