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If you have checked all the fuses etc as you say and they are fine - you need then to check the connections at the rear of the audio unit and in the circuit-
You likely have a bad / faulty connection in the AV circuit to be found... Sometimes you can get a damaged loom too so check for that.
You can also try rebooting the system by disconnecting the battery for an hr and then re connect.
I trust this answers your question for you - Let me know though if you need anything more -
~>>~~>>~ Meanwhile now at this point- Please do click on the "Exc / Ok rating" for me at this time.. "Thank you" in advance for that ... Note that you can get back to me anytime at all after doing the rating - it doesn't close you out --Best Rgds, MIKE