If all 3 cameras are not working the multiplexer probably has a loose power red wire), ground (black wire), or monitor trigger (green wire) connection to it.
You will find the multiplexer under the dash to the left of the steering wheel, its a small silver box about the size of a deck of cards.
Is the monitor showing a blank screen or no video message, or is it not changing from the radio screen?
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2021 Newmar Baystar 3401
2019 Jeep Cherokee Trailhawk toad
2017.5 Forester 3051S Traded 7/2020
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