Hello, I bought this camera: https://www.rcd330.com/product/vw-passat-jetta2012-tiguan-dynamic-track-parking-line-handle-rear-view-camera-for-rcd330g-plus/ after installing all the wiring, I tested the camera and it is just showing a black screen. Any ideas for why this could be happening? I have a 2014 Jetta Sportwagen btw