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  1. #1
    Join Date
    Mar 2018
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    Default Grundig line in Aux Line in Adapter for Smart Fortwo 450

    I purchased this item from ebay: Aux Line in Adapter for Smart Fortwo 450 1997-2007/MP3 0 1/8in Jack and it does not work! There is no button on the grundig Smart cassette radio. The connectors on the line in adapter fit the radio but no signal is detected and there is no way to select the Aux in feature. I got a refund. Is there a way to utilse the line in port?

    Availbel at :https://www.ebay.co.uk/itm/Aux-Line-...72.m2748.l2648
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    Last edited by Pocetsize; 8th March 2019 at 13:43.

  2. #2
    Join Date
    Jul 2005
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    Default Re: Grundig line in Aux Line in Adapter for Smart Fortwo 450

    It won't auto-detect the signal and switch inputs, the cassette head unit wasn't that clever


    Are you pressing the CD/CC button ?
    fq101.co.uk

  3. #3
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    Default Re: Grundig line in Aux Line in Adapter for Smart Fortwo 450




    If the Head unit won't change to CD changer input (CC) then it may be because CD BUS isn't able to communicate with a changer microprocessor.... obviously because you don't have a cd-changer installed in the car.


    I can't remember if you need to pull it down to 0volts with a pulldown resistor to trick the headunit.
    fq101.co.uk

  4. #4

    Default Re: Grundig line in Aux Line in Adapter for Smart Fortwo 450

    On the CD-version of the headunit you need a strap on the blue connector
    in order to enable AUX-mode. I assume that the same is neded for the Casette drive ?
    The strap should be between pin 13 (upper left pin on the previous shown drawings),
    and pin15 (middle left pin = ground)).
    Then push the CD button to select.
    Bjorn

  5. #5
    Join Date
    Feb 2006
    Location
    Hampshire
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    1,089

    Default Re: Grundig line in Aux Line in Adapter for Smart Fortwo 450

    I have used the aux in on many of the cassette units. As said, plug into the correct part of the mini-iso socket, then select CD.
    You'll get a message on the display saying "NO COMMU" but press play on your external unit and you'll hear the sound.

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