This is illegal to do in many states so it is not recommended that you bypass the saftey feature and can result in you being ticketed and fined. On this unit, for testing purposes, you would ground the parking brake wire and the screen should come on and stay on.
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here is what you need to do is, get a toggle switch and hook one side to a ground and the other side to the parking brake wire on the unit.
use the switch as a brake because you have to set brake for a few seconds then release and set again but keep it on this time.
you will have to do this every time you start the car.
I ran across of alot of lcd head units that requiers the parking brake wire connected so it will show the video, (usually just audio if parking brake not on). But if you connect that wire to a proper ground (screen always on) or a grounded switch so you can control it maually (turn it on or off when you choose)
Yes, there is a way to watch a movie without the parking brake engaged. The parking brake safety mechanism is there for a reason, and I do not suggest that you disable this sytem so that you can watch movies while driving. With that said, the simplest way to bypass the parking brake system is to take the parking brake wire from the head unit, run a wire to a chassis ground point, and then put a toggle switch inline so that you can flip it on and off. This will simulate the engaging/disengaging of a parking brake.
Again, I do not condone or recommend watching movies while driving. There are enough distracted people driving on the roads.
On the parking brake under the dash is a switch at the top that actuates the parking brake light. On most vehicles most are two wire switches, but some are one wire switches. If you have a two wire switch then you can unplug it and use a test light with the ignition turned on without starting the vehicle and test the wires to see which is the hot wire and then connect to the one that has no voltage on it because it is the ground for the switch. The wire is used to detect the parking brake position as engaged before it will allow viewing of the DVD player when the vehicle is not moving. When the brake is off the DVD player will not play DVDs, this is a safety measure so the driver will not be distracted while driving. Good Luck, RAC