answer for b = would appear it allows HEADPHONES ONLY in the rear to have something that the radio can do like a CD playing WHILE the front still have the radio on.
The RADIO must have this as a function but I have a feeling it MIGHT need to CLASS 2 data stream as well, unsure of that part though.
Answer to c = This small unit sends the DVD rear screen sound to the radio so it can come out on the speakers (really bad way of doing this), it appears the rear DVD and screens are just an add in and no way wire anywhere else to the system (hence the frequency settings for sound so the radio can pick it up).
I'm getting there which is good...
Many Thanks
Ashley
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Many Thanks
Ashley
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