W215 window opens when ignition started. Huh?

Discussion in 'Electronics' started by growlygrowler, Mar 22, 2014.

  1. growlygrowler

    growlygrowler Active Member

    Messages:
    62
    Joined:
    Aug 20, 2009
    Car:
    1990 500SL
    Hi

    I've recently acquired a W215 for a knock down price as a fixer-upper. I think I've now sorted the ABC issues, but there's one vexing issue: When I start the ignition, the passenger window opens fully. WTF? This is like Alfa Romeo electrics.

    I've replaced the motor as I had a spare, but the issue is unchanged.

    Replace to door control unit? Has anyone seen this before?

    cheers

    Dave
     
  2. jaymanek

    jaymanek Authorised Forum Sponsor Authorised Forum Sponsor

    Messages:
    16,333
    Joined:
    Nov 29, 2002
    Location:
    Nuneaton Warwickshire
    Car:
    Lots of Mercedes!
    HAve you synced them? Ignition on, up and down 3 times holding at each end for a few secs.
     
  3. OP
    OP
    growlygrowler

    growlygrowler Active Member

    Messages:
    62
    Joined:
    Aug 20, 2009
    Car:
    1990 500SL
    I think so. 3 times? I'll try it right now
     
  4. OP
    OP
    growlygrowler

    growlygrowler Active Member

    Messages:
    62
    Joined:
    Aug 20, 2009
    Car:
    1990 500SL
    OK, just to prove to myself that it's not something stupid, I've tried resetting it and it's still the same. Start the engine and the left window goes down.
     
  5. m2287

    m2287 Hardcore MB Enthusiast

    Messages:
    2,658
    Joined:
    Jan 27, 2010
    Location:
    cambridge
    Car:
    Bentley Continental GT
    The window control unit is under the drivers side rear seat (take the seat base off, then rip the foam and you will see the rectangular black box) it has two plugs going into it, try unplugging both of them then plugging them back in.
     
  6. OP
    OP
    growlygrowler

    growlygrowler Active Member

    Messages:
    62
    Joined:
    Aug 20, 2009
    Car:
    1990 500SL
    OK thanks. I'll give that a go. I thought that unit just controlled the rear windows? But I'll take your word for it
     
  7. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

    Messages:
    18,315
    Joined:
    Feb 8, 2007
    Location:
    Horndean, Portsmouth, Hampshire, Southsea
    Car:
    C43 AMG with a 55 engine and supercharger, MK1 Caddy, S500, etc
    That control unit is for the rear windows.

    Check the loom in the door hinge. They tend to chafe.
     
  8. m2287

    m2287 Hardcore MB Enthusiast

    Messages:
    2,658
    Joined:
    Jan 27, 2010
    Location:
    cambridge
    Car:
    Bentley Continental GT
    I'm not sure to be honest, I had problems with all 4 of my windows, replaced that and it was all good after!
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.