Originally Posted by
veen
My Dad has an IS 250 with Navi. Someone at his work also has one, and is the tech guy, who hooks my Dad up with all the shiz.. Anyway, my point, the guy disabled it by hitting a series of buttons/spots on the screen, not sure how and it seems a little back door but its possible.
im sure if you do a lil research on the IS boards u can find the trick.