No, it wouldn't. Chances are you either have a bad ground or the Dietz is causing interference. Make sure the Dietz and radio are grounded to the same spot.
I had the same issue, do your best to keep power lines and RCA lines from DVD and Dietz seperated when you tuck th em in the dash
I had the same issue, do your best to keep power lines and RCA lines from DVD and Dietz seperated when you tuck th em in the dash