Range Rover Vogue L322 Reversing Camera 55 plate

Good Evening All
recently purchased a l322 vogue 55 plate Supercharged, love the car and got a fantastic deal and Warranty with the car?
i have been using the car and had no problems but the reversing camera is not working just get the black screen? yes i know what some of you are thinking? like use the 2 big black things hanging off the doors? or the one hanging from the windscreen? well yes i guess that would be the easy way to ignore the screen but i would like to get it working?
took the car back to the garage and they fitted a new camera (still not working)?
on another note i have a venture cam in the car and that works so i guess its not the head unit?
any ideas? i have had a look around the wiring but couldn't see any problems?
does anyone have a wiring diagram? or had the same problem?
many thanks

Thought you said it had a warranty take it back.

i have they are happy to look at the car but they are at a loss?
so was just asking the question?

You didn't ask a question, you asked 14.

The warranty? is what it is? and it's for exactly this problem? Take it back?

Excellent warranty if the first issue you have is beyond them. They can get a proper mechanic to fix it (at their expense).