At least in my car (2013 Chevy Volt), the backup camera is on an internal KVM-type switch.
The moment I switch into reverse the camera forcibly takes over the infotainment screen. You can occasionally see the signal flicker when the switch happens.
But also… a backup camera is hardly critical equipment. It’s there for situational awareness (and a good idea), but doesn’t replace the mirror. And since nobody drives in reverse at high speed, stopping is always an option if it malfunctions.
The moment I switch into reverse the camera forcibly takes over the infotainment screen. You can occasionally see the signal flicker when the switch happens.
But also… a backup camera is hardly critical equipment. It’s there for situational awareness (and a good idea), but doesn’t replace the mirror. And since nobody drives in reverse at high speed, stopping is always an option if it malfunctions.