Use this manual if you want to connect a reversing camera to an aftermarket radio. First check whether the radio has a camera input, usually this is indicated by "CAM" or "CVBS in" and check whether the radio is a signal wire, usually a signal wire is indicated by "BACK" "REVERSE".
A signal wire can be emit an aftermarket radio with CANBUS power, and with a radio without CANBUS you have to supply this signal wire with voltage, and drain this voltage via the reverse row lighting. As soon as the signal wire receives 12V voltage, the radio will switch to Camera view.
Here you have a video that can help during installation. In this video we show how you can connect a camera from us to an aftermarket rns look radio.