Not sure I can help you but reminds me of when I replaced the radio in my daughters ford tempo. When I was done, it would come on when the passengers door was opened.
So I’m guessing the system powers up to activate the camera. What happens when you turn on the parking lights. Kinda sounds like there would be 2 power inputs 1 - camera and 1 - camera and their tied together.
BTW, welcome to JOF.
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2019 Pinnacle 36 FBTS
2016 Silverado 3500 CC SRW DuraMax/Allison
1975 Corvette for the sunny days n dry roads
2017 RZR for the rainy days n muddy roads
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