This is my earlier post, when I had a problem that turned out to be water vapor in the camera. It was replaced under warrantee:
I have a 2011 Sunseeker with a backup camera. It is not Zone Defense and there is NO indication of the company on the user manual. It is titled:
In-car TFT LCD Monitor. The monitor model is DS-Z8. Google that and it seems to be a Chinese company. There is NO indication of the camera itself, which is white and round.
My camera was not sealed well and moisture collected inside. I just had it replaced under warantee. The new camera is still white and round but has a little hood on top which hopefully will keep rain out. However the camera mount has little holes for positioning rather than an open track, so exact vertical positioning is not possible.