FWIW - I have an aftermarket radio/CD/DVD unit installed with a flip up screen in one of my Crossfires. As a safety feature the unit will not play a DVD while driving - makes sense. It will only play a DVD if the emergency brake is applied. Although, you can bypass this safety feature if you install a switch similar to the one the OP posted that fools the unit thinking the e-brake has been applied. For those curious, no I do not watch DVD's while driving, although it's a nice option to have.