OK i got one of these. If the unit looses power, it will stay closed, its like a default. If you keep power to the unit and only disconnect the ACC you should never have a problem. But if you unhook the power feed to the monitor, it will default to closed the next time you use it. I discovered this when I disconnect my battery to work on my car. Its normal, but as long as the power feed never loses power and you opened it once, it should work fine as long as the ACC is hooked up right.