Check to see if your reverse lights come on. If they don't then you blew the fuse that controls the camera, backup lights, and I believe hill assist. That fuse is under the steering wheel and is a green one. If those all work then something else is wrong and you will have to check voltages like the others have suggested.
I have the same issue with my harness from Carbon with the 918ws unit and I am fairly certain something else is wrong with the cable.
|