Thanks for the response, I am using the one brown one, it's the one that has the yellow tag on which says reverse camera in if I remember, it has a small amount of cable which comes out the HU. I also tried it in the secondary yellow AV input which is just the socket, then set the setting to 2nd camera input use as reverse which also didn't work. Really am at the end of my teather as I'm all out of ideas.