enigma9o7
Member
Most head unit with a screen want this wire, and will only let you play videos when handbrake wire is grounded (handbrake/e-brake engaged), as a safety "feature". If you leave that wire unconnected/floating then it wont play video. Of course many self-installers will just hook it up to a hard ground and thus can play videos whenever....
edit: sorry, I see this was already answered
