Hello. My name is Brian and i'm located in Czech republic. At this time, i do not own any LS model, but i hope it will be very soon....
Not sure if my post would be helpful or not, but i was today at our Lexus dealer here to look-over some 460's. While i was there, i asked the sales manager about the lockout, if they are able to deblock the Navigation/DVD function. His answer was: "Yes, no problem. We can do it for free at our shop" I also asked if they are using some aftermarket units like VAIS(if i'm not wrong) or so and the last thing he said was that they work only with OEM tools.
On my opinion, every US/CAN dealer is able to unlock the features above. So probably, the "problem" is with Lexus USA. Just a thought.
My English is not of the best ones and i'm sorry for that!