Humm, maybe I need to see if they have 11.1 for the 2006...
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Sorry for the old-thread bump but has anyone tried gen 2/3 12.1 update? available here, though possibly sketchy, especially the first one which it looks like someone is burning and selling, but if it works.......
http://www.ebay.com/itm/Lexus-Toyota-Navigation-DVD-Gen-2-3-12-1-U07-WEST-2012-2013-FREE-SHIPPING-/190834374050
http://www.ioffer.com/i/u07-2013-toyota-lexus-gps-navigation-dvd-v12-1-gen-2-3-475445404
I think if you look under the front passenger side seat, the navigation unit dvd drive is there. I had to loosen my passenger seat to get the plastic cover off that protects the nav unit.
There should be a button that you push and the old DISC should eject out. You replace that with the new DVD drive.
Will search to find the thread with pictures. I did have to take my nav unit out and drain the onboard battery for it to read the new nav DISC dvd since there was a firmware update on the disc.