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I don’t know to do either.
Start with canbus debugging, if it’s not connected to headunit then it should only miss video but if canbus is missing / wrong then you don’t get any communication at all.
Just check all the wires from BDC to R3 and from R3 to camera. According the diagram ignore colors, focus on the pins.
But also check if you have not mixed up R3 with R2.
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