I have a JVC KW-M750BT it is installed and most of it is working fine. The reverse camera wire is connected into my reverse light wiring and when I put car into reverse it activates the camera BUT the screen is black. There is the parking sensor wire that I have not connected yet and did read that it needs to be connected for any video display to work. How am I going to reverse with the park brake on, is this how this wire connection works or does the Head Unit just want to know it has been connected. I read another thread people suggest just earth out the wire, I haven't tried this yet. It seems a bit strange to need a park brake connected just to view reverse camera! Manual: http://www33.jvckenwood.com/pdfs/B5A-2850-00.pdf - see page 89 for the PRK SW Unit: http://au.jvc.com/car/av_receivers/kw_m750bt/ All this is into a VT Commodore. I have searched for a diagram showing this type of installation but no luck, old images not available etc. Any help Edit: I found this video it looks like it might be the answer. Still if you have done this or know it is all that is needed please comment.