It depends on what signal the video player is looking for
also it may not even be looking for the signal from the E brake
it may be looking for the speed sensor ect
but firstly what you do is
-get a voltmeter and detach the wire from the E brake to the radio
on the end that connects to the brake (brake>>> wire end) connect the voltmeter to the wire and then the other side to the metal point on a car (negative
apply the brake then take it off
what do you see when the brake is on
it will be either 12v or 0v
if the brake is 12v when it is engadged then
get the wire from the radio that attaches to the brake wire
and connect this wire to 12v temporarily and test it out and see if it works while driving
and its the oposite thing if it is 0v but make sure the tempory positive wire is detached
if E brake has no voltage change then its going to b trickier to do this
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