You have the same Rear View Safety Switcher as me. The simplest, least damaging way is look at the 3 camera inputs on the Switcher. Using trial and error, just unscrew the camera inputs for the left and right cameras.
If that doesn't work, go to
https://www.rearviewsafety.com/ and look for the pin diagram for the Switcher box.
There is a "trigger" wire for each side camera and the rear camera.
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