do the escalade navs even play dvds at all? my freinds dad has a 02 Lexus es 300 with nav, and we tried puttin a dvd in adn it gave us an error message sayin it wasnt a map disc. Im starting to think not all of them paly dvd. the navs on the dts, and sts both have a ''dvd'' button on them. to switch to dvd mode.
