Hello, I installed a new radio that had a screen. This radio came with a backup camera. This stereo is the Jensen CAR 710-4CAM. I tried wiring the backup camera to the backup light and ground, but it wouldn’t work when put in the backup camera plug on the stereo. When I put it in the AV video in, the stereo said it couldn’t display the signal because my E-brake wasn’t on. What should I do from here? Thanks.