W212 Heated mirrors on all the time

Discussion in 'Electronics' started by Pottsy, Jul 22, 2011.

  1. Pottsy

    Pottsy Active Member

    Messages:
    90
    Joined:
    Nov 15, 2009
    Location:
    Leics, UK
    Car:
    W212 E220 CDI SE
    I have an E220 CDI Bluefficiency and it's good. :D

    One oddity is that it's not very economical in cold weather, and very economical in warm weather. This is on long (1.5 hour) journeys, and I am fully versed in all the usual discussion about the performance of diesels in the cold.

    However...

    I discovered that my heated mirrors are on nearly all the time. Even with the switch off. It transpires that if the outside temperature drops below 15°C then the mirrors heat up the passing atmosphere until the temperature rises all the way up to 18°C at which point they turn off.

    For a car that claims to have LED rear lights to save energy it seems odd to have two dirty great electric heater elements pointlessly switched on in the airflow. But MBUK have confirmed that this is how it's meant to work.

    The question is: car someone with the MB magic interface turn this "feature" off, so I can just turn the mirrors on and off with the switch? One element has already burnt out, and I guess more failures are to follow.

    Thanks..
     
  2. GP801

    GP801 MB Enthusiast

    Messages:
    2,906
    Joined:
    Jun 18, 2010
    Location:
    Sussex and Tuscany
    Car:
    2003 W209 CLK, 2005 R171 SLK in UK, 1995 S124 E280 in Italy
    I thought they came on just for a set time. Thats how they seem to be on our cars but they are rather older vehicles than yours.
     
    Last edited: Jul 22, 2011
  3. OP
    OP
    Pottsy

    Pottsy Active Member

    Messages:
    90
    Joined:
    Nov 15, 2009
    Location:
    Leics, UK
    Car:
    W212 E220 CDI SE
    Yes, it's odd. I have had them on for 3 hours continuous (very hot to the touch) because it was less than 15 when I set off and it never got about 18.
     

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