Hello everybody. Here is the way to connect your Stock Toyota rear view camera to an aftermarket radio.
Follow directions on your 6 volt resistor module and connect to rear view camera +
located the + trigger for your aftermarket radio (usually labeled "back") and connect to the reverse + trigger from your car harness.
you need this step so you can trigger the screen of your aftermarket radio to switch to viewing the reverse cam image. If you are using an aftermarket camera, you will not need this because it has its own trigger wire.