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muted

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    Audio 20 Always muted when turned on (New Merc Owner)

    Hi Everybody, Just picked up my 2005 C180K Sport with the Audio 20 headunit. I don't have the cd changer or the phone pre-wiring. My problem is whenever the Audio 20 is turned on, there is no sound, and the volume wheel doesn't work (neither do the steering wheel controls). Pressing the...
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