I just installed a JVC AVX810 DVD system in my 2004 F150 Lariat. all I did was install a switch inside my center armrest storage bin. one side to the light green wire the other to a near by ground. When the switch is off and I play a dvd while the truck is running the "Parking Brake" warning comes on. Flip the swith and it's movie time. BUT that for my JVC and that hint came from a YouTube video and alot of google- ing..Just google your make and model stereo bypass..... good luck.. post your result..