^ Exactly! I laughed my ass off when I learned some aftermarket manufacturers were using a wire to tap into the E-brake. This would insure that only "parked cars" could play movies! OMFG. As a few of you have figured it out, all you need to do is ground that wire, and you're good to go.
Pioneer got tricky though by using the GPS signal (in their high end units) to sense if the vehicle was in motion....and if it was, the DVD wouldn't play on the head unit. Go Jenson Go!
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1993 Camry LE 5SFE AT, 2006 Nissan Armada LE 4x4, 1971 Cadillac Coupe DeVille "pimp juice"
Toys: 2007 Coachmen 19FLB, 2007 Regal 1900 V6
I'm the biggest boss thatchu seen thus far! Baby, that's muh wi'zzard!