My AVIC D3 unit has been installed in my 2006 Kia Sorento. When i either shift into reverse, I get a screen that says the image may be reversed instead of getting any video from the camera. I checked connections to the back of the D3. There appears to be good. Power, ground and video connections all seem good. How can i test to see of the camera is blown? I suspect this is the problem. But i test another camera and i get same problem. Would like to know for sure before i go ahead and order a new one. Thanks.