So I got an avh-8400bh installed in my 98 Lexus ls400 and the video from a DVD is not working I can hear sound but no video. Yes I know I got to bypass the ebrake etc but with this do I bypass it grounding it or actually by getting a signal from the ebrake itself? I had this guy install the hu for me and he put a relay but I think he may have just plug the wires incorrectly. So can anyone help out and let me know if I by pass by grounding it or to signal itself?