Well, neither Lexus or my local dealer was any help at all. My service centre found an aftermarket kit that will do the job. It fits right into the dash and connects to the raio to use the indash controls, so as it would have worked had Toyota installed it in the factory.
I have learned a disappointing lesson in this about Lexus. They are a bit too exlusive for my tastes, and frankly,not that much better in the build department to warrant it.
Sadly, older, and wiser.
Dave