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W220 COMAND Not Working

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by The Barge, Jun 24, 2017.

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  1. The Barge

    The Barge New Member

    Messages:
    5
    Likes Received:
    4
    Joined:
    Jun 23, 2010
    Location:
    Exeter
    Your Mercedes:
    1999 W220 S430
    Hi folks, I've recently bought an early W220 but the Stereo/Nav/CD/Phone isn't working. It is the early version of COMAND, so far as I can tell the fuses are OK however the fuse diagrams are missing.

    Head unit/phone/nav - not working at all.
    CD changer - eject button tries to eject CD cassette but appears broken. However this suggests there is at least power going to the unit.

    I pulled the head unit from the dash and found that there is power on both the switched feed and permanent feed. Therefore I'd guess the problem is in the head unit itself?

    Any help would be much appreciated, I'd very much like to have the system working!
     
  2. OP
    The Barge

    The Barge New Member

    Messages:
    5
    Likes Received:
    4
    Joined:
    Jun 23, 2010
    Location:
    Exeter
    Your Mercedes:
    1999 W220 S430
    New head unit fitted, which works well.

    Unfortunately it's now revealed the next issue, which is no sound. The Bose amp and CD changer are damp so I can only guess these have both failed. There is power to both but nothing coming out of them.
     
  3. ansta1

    ansta1 Senior Member

    Messages:
    297
    Likes Received:
    58
    Joined:
    Jul 28, 2015
    Location:
    Northampton
    Your Mercedes:
    s500LWB/2002
    Possible fibre optic circuit failure, try removing devices from the ring with af/o connector till it works.
     

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