panasonic touch screen

i don't know what model it is or anything, but this question is for a friend. i have the eclipse 7002 and i just grounded the signal wire so i can play movies while driving. my question is...........how do you do it for the panasonic? i know that all companies have a different way of doing it, but i obviously don't know the panasonic.
thx in adv.
later

I am assuming that you are reffering to the parking brake wire on the unit. Most parking brakes read ground when engaged so I would assume that most sustems look for a ground. Unfortunately I dont know about the panasonic. Put a 1 amp fuse in line with it and ground it. It should blow the fuse if thats not the polarity it likes. Do this at your own risk.