It is completely plug and play! The unit cost me right around $300 dollars on eBay from some Lexus dealer. It took me a little over an hour to install. The installation was not hard at all. I can't believe I actually paid the dealer almost $800 to have it installed when I bought my wife's ES350. Here is a link with detailed instructions and pics that I used: http://my.is/forums/f126/sat-radio-is350-w-nav-ml-system-347356/
It will be like the last post on that page and divided into two parts.
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