because its a safety issue.It can play DVDs but only music, not video. Makes no sense though.... why make a touchscreen without dvd playback capabilities lol
It's not the motion safety issue, the unit itself just doesn't support video playback lol. It does have a safety disabling setting up time or bluetooth settings while driving though.because its a safety issue.
try with the car parked and the ebrake up. some manufactures added a safety feature to only allow you to watch anything when the car is stationary with the ebrake applied. some make will even prohibit setting up the navi while the vehicle is in motion.
most aftermarket unit has a safety wire that must be tapped to the ebrake. almost every unit iv messed with, the safety wire must be grounded but pulsed. meaning if the wire is already grounded and you turn the unit on, it wont let you view any motion pictures. a way to bypass it without using the ebrake method is to utilize a switch. you just take a switch and ground one end, then connect the unit's safety wire to the other end of the switch. you then simply flip the switch on to make a complete path for grounding and all your movies/videos will play. once the unit or vehicle is turned off, you will have to reset the switch again once the vehicle or unit is turned back on.
as for the law and safety concerns, viewing motion pictures while driving is illegal.