The DVD Nav unit does not have the MPEG 2 decoder chip needed to play DVD video, and it can't be added after the fact. (quote taken from another forum)
You can use the NAV screen to play movies and/or video games but you'll need a video source and an adapter box similar to the AV Electronics NAV-TV unit. I have a PS2 mounted in my trunk, a NAV-TV unit and then a cordless controller to watch DVDs.
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