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Is there a back up cam (or adapter) that will work with the factory Nav unit?
Who is the factory Nav made by?
Factory NAV is made by Denso.
There is no provision for a backup cam in the head. There's a company that will solder in an RCA connection that would let you do that, but you'd have to pull it and trust them to not mess up the head unit. Not sure who it is that does it, been a long time since I heard of anyone having it done. Somebody in NYC.