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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
The DVD player is it OEM?
When the headphones are plugged up does the sound from the speakers shut off?
Are you using the headphone jacks that are OEM or did your radio come with jacks?
Can I assume there was not a headphone issue prior to the radio swap?
Thanks, ***** ***** confirms there is a compatibility issue with your new radio and the rear control unit and DVD player. I assume the rear control unit wiring was not messed with and its still powering up. The DVD player is partially communicating with your radio but it is not allowing the RCU to make changes to the DVD player. Below is a wire diagram and the Ford diag but that is based on a Ford radio being used.
Thanks for using Just Answer, and rating me so I am compensated, Chris