It's only a guess but I would have thought they maybe are connected to the kbus at some point being as they dim when you put the lights on.
The best one I had was the first one I imported direct from China think it was the same time as Picky bought his, never gave me any problems sometimes I wish I'd never upgraded and kept with that first unit.
Did have a Kenwood before that one but it was about £1200 when I bought that, it did just work though with no problems at all.
Sorry I can't be of more help.
Andy
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2002 White Gold 75 Connoisseur SE CDT manual.
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