1992 R129 drivers window

Discussion in 'Electronics' started by 056bob, Aug 20, 2017.

  1. 056bob

    056bob New Member

    Messages:
    13
    Joined:
    Feb 19, 2014
    Location:
    Cornwall
    Car:
    300SL 24
    I lowered my driver window and it would not go back up I checked the fuse it was OK. I raised the centre consul,no loose wires, so I changed the connections over and the passenger window worked on the drivers switch and the passenger switch the drivers window did not work on either. I have changed the window motor as it was faulty but now I can,t get any power to the window and the front roof latches will not open but will close again if I first open them manually.
     
  2. RichardF

    RichardF Hardcore MB Enthusiast

    Messages:
    527
    Joined:
    Aug 24, 2013
    Car:
    Sl 320
    Maybe worth looking @ the roof module (under the rear bench seat) controls windows and roof, it contains various relays etc.

    1st though check ALL your fuses are scrupulously clean, some people change them to brass/copper and find this more reliable. I just use some switch cleaner to seat them.
     
  3. OP
    OP
    056bob

    056bob New Member

    Messages:
    13
    Joined:
    Feb 19, 2014
    Location:
    Cornwall
    Car:
    300SL 24
    Thanks that was my next move, I wonder if the power to the windows is constant and the switch earths it to operate the window or does the switch send power to the window for it to function
     
  4. RichardF

    RichardF Hardcore MB Enthusiast

    Messages:
    527
    Joined:
    Aug 24, 2013
    Car:
    Sl 320
    I think it will reverse polarity for up/down.
     
  5. RichardF

    RichardF Hardcore MB Enthusiast

    Messages:
    527
    Joined:
    Aug 24, 2013
    Car:
    Sl 320
    Another thought.

    The 1st part of the roof opening sequence is for the windows to drop, if they don't then the roof latches won't release.
     
  6. OP
    OP
    056bob

    056bob New Member

    Messages:
    13
    Joined:
    Feb 19, 2014
    Location:
    Cornwall
    Car:
    300SL 24
    Thanks for that, I'll remember that when I return to work on it what has thrown me is the window wound down and would not then move, the window motor was faulty I tested it twice, I changed the motor and now have no power to that window so it appears that 2 faults occurred at exactly the same time
     
  7. OP
    OP
    056bob

    056bob New Member

    Messages:
    13
    Joined:
    Feb 19, 2014
    Location:
    Cornwall
    Car:
    300SL 24
    I sent the roof module to BBA REMAN Telephone 01634 687222 they picked up the unit and returned it fully working in 6 days for £260. I think that it is excellent service and would recomend them if you have a roof problem
     
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