I just bought a AVH-P4900DVD and I got told by the salesman to regiter on this site to find how I can have a movie playing while driving.

Hopefully this is enough information.

Thanks for the help.

Eric

You need a toggle switch. One side of toggle switch goes to ground. The other side of toggle switch goes to green parking brake wire of 4900 harness. Turn switch on about 5 seconds after the unit itself turns on. Turn off switch when you turn off car. 1 bypassed 4900.