2003 sl350 comand black screen?!

Discussion in 'Electronics' started by SL350_SWINDON, Sep 14, 2011.

  1. SL350_SWINDON

    SL350_SWINDON Hardcore MB Enthusiast

    Sep 14, 2011
    SL350 2003
    Hello friends! I have just purchased an SL350 and have a few little issues with it so im sure you'll see my name popping up a bit!

    I have a problem with my comand unit on my SL350, my previous job role was electrical engineer so im quite handy and understand most things relating to this.

    when i press the on button for the comand unit the back light comes on and i can hear the disc spin - No sounds can be heard and no graphics at all are shown on the display - not even the mercedes logo.
    It will allow me to eject the nav disc in the unit but that is all.
    I have a bose system with cd changer in the storage compartment behind the passenger seat.

    I have removed the unit and checked the 10amp fuse which is ok. I have also done the fuse reset by removing the fuses behind the drivers seat storage compartment for 5 mins and reinserting them.

    When i have all leads in the back of the unit except the fibre optic i cannot see a red light (send signal) coming out of the unit.

    The only thing i know is that the secondary battery went flat and was replaced and now comand not working.

    I also know the comand unit was replaced back in 2007 under warranty.

    Please can anyone help?

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