I never tested it personally but I'm assuming that its tested and working because I bought from someone sells bmw parts. I couldn't tell you if it has those lines to guide you when backing up. I know its hard to buy something that you don't know much about but I bought it because I thought it is a nice feature to have on my X5. I will try one day to go to a stereo shop to see if I can get it tested also to find out if it has those lines and I'll let you know