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Sony Ericsson Car Handsfree Mute wire

Discussion in 'Hobby Electronics' started by Spanky, May 11, 2004.

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  1. Spanky

    Spanky Guest

    I don't have an oscilliscope and I haven't put the DMM on it yet but can
    anyone tell me what output the 'music mute' wire supplies in a Sony Ericcson
    car handsfree system? Does it go low, high or does it pulse?
  2. Spanky

    Spanky Guest

    So when there is no call the mute wire should be floating and when a call
    comes in the mute wire should go to earth?
  3. The mute wire puts out a constant earth.
    Depending on the model of phone and car kit it is usually the following
    red - +12V ACC
    yellow- +12V Constant
    Black- Earth
    Green- Mute

    *** If it puts out a constant earth,then how does it do anything except
    connect something else constantly to earth???????????????????????????

    Brian Goldsmith.
  4. Spanky

    Spanky Guest


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