LexusSC430

I cant seem to find an answer to this, any help is appreciated. I Have a friend, their 08 Navigation works, but it doesn't. What I mean is....
None of the buttons work, radio, AC, whatever...
The weird part is though, if you are on the map, you can put your finger on the screen and it will scroll to that spot, but seems like it may just scroll right when you do that.
Any thoughts or suggestions?