SLK R170 Mod to drop windows when door opens

Discussion in 'Electronics' started by techcareuk, Jan 18, 2014.

  1. techcareuk

    techcareuk Member

    Messages:
    51
    Joined:
    May 13, 2009
    Location:
    Nr Wigan, UK
    Car:
    S500L (2002) W220 / SLK230k (1999) R170 / SLK280 (2007) R171 / E320 CDi sport (2007) S211
    Hi all,
    I'm trying to design a mod that will drop the window a couple of mm when the door is open the close it again when its shut!

    the end stops that are glued to the window behind the door card keep falling off which allows the window to raise slightly too high and fouls the door seal when the door is closed, this mod will do away with the need for the glued on stops and will drop the wndow when the door is opened alowing the door to be closed with the window lowered a couple of mm and raise it again once the dooris closed, much like the later SLK's and CLK's already have from manufature.

    I have designed a simple relay circuit that will take the GND signal from the door switch and send momentory open and close signals at the correct timing to operate the windows.

    My problem now is that i'm trying to work out where I can tap into to operate the windws without the IGN being on? my first thought was to tap into the window switches but they are not operational without the IGN switched on?

    I've tried t get hold of a circuit diagram of the R170 window system but cant find any copies?
    I feel their must be somewhere i can tap into because mods like the smarttop give the function of raising and lowering the windows remotely with the IGN off.

    any help much apprieciated!

    Mark
     
  2. martyz

    martyz Hardcore MB Enthusiast

    Messages:
    2,390
    Joined:
    May 14, 2011
    Location:
    New Forest
    Car:
    ClK240 209,190E 201.
    Take a permanent live feed from the battery and fuse it in line,won't your idea of taking a
    signal from the door switches be too late as the door will be opening? how about taking a signal from the door handle by a micro switch on the door release rod?
     
  3. E270 Owner

    E270 Owner Hardcore MB Enthusiast

    Messages:
    1,672
    Joined:
    Dec 23, 2012
    Location:
    S E London
    Car:
    Anything I get my hands on.
    My XKR uses a micro switch on the door handle to lower the window and the door pin switch to raise it.












    .
     
    Last edited: Jan 18, 2014
    1 person likes this.
  4. OP
    OP
    techcareuk

    techcareuk Member

    Messages:
    51
    Joined:
    May 13, 2009
    Location:
    Nr Wigan, UK
    Car:
    S500L (2002) W220 / SLK230k (1999) R170 / SLK280 (2007) R171 / E320 CDi sport (2007) S211
    Thanks Martyz for your idea, but my problem is not where to get a supply its where to apply the signal to raise and lower the windows that will work with the IGN off!
    The car disables the signal at the switches when the IGN is off so i dont think i can use the switch connections?

    the window only gets in the way of the seal when the door is being closed so it wont be a problem opening the door before it has time to send the window down a fraction! as long as the window is dropped a fraction when the door is being closed it will work!

    Mark
     
  5. martyz

    martyz Hardcore MB Enthusiast

    Messages:
    2,390
    Joined:
    May 14, 2011
    Location:
    New Forest
    Car:
    ClK240 209,190E 201.
    Not perfect,but drop the window a touch before getting out,when closing the door use the remote and hold lock button so full closure kicks in and shuts the window.
     
  6. OP
    OP
    techcareuk

    techcareuk Member

    Messages:
    51
    Joined:
    May 13, 2009
    Location:
    Nr Wigan, UK
    Car:
    S500L (2002) W220 / SLK230k (1999) R170 / SLK280 (2007) R171 / E320 CDi sport (2007) S211
    yep thats what i do when i drive the car!
    But its my wifes car and she cant be bothered so windows always get forced onto the outside of the door seals and doors get slammed shut, therefore I've designed this circuit before she comes home and tells me the ****** window has smashed when she closed the door! ;)
     
  7. IanA2

    IanA2 Hardcore MB Enthusiast

    Messages:
    4,535
    Joined:
    Sep 17, 2003
    Location:
    East Mids
    Car:
    SL60 AMG, GES300, Lexus GS 430
    I'm surprised it doesn't do it already. My '97 SL does the window drop dance :D
     
  8. flying haggis

    flying haggis Hardcore MB Enthusiast

    Messages:
    277
    Joined:
    Nov 8, 2011
    Location:
    A house in Norfolk
    Car:
    E class sport est with AMG/Brabus package SWMBO has B class
    my mates Freelander does exactly as you propose when he opens the rear tailgate.
     
  9. Howard

    Howard MB Club Veteran

    Messages:
    18,624
    Joined:
    Apr 23, 2004
    Location:
    Toad Hall
    Car:
    CLS 500 / A 150
    can you not just fit a module from a later car ?
     
  10. IanA2

    IanA2 Hardcore MB Enthusiast

    Messages:
    4,535
    Joined:
    Sep 17, 2003
    Location:
    East Mids
    Car:
    SL60 AMG, GES300, Lexus GS 430
    That would seem to be a sensible suggestion :thumb:
     
  11. OP
    OP
    techcareuk

    techcareuk Member

    Messages:
    51
    Joined:
    May 13, 2009
    Location:
    Nr Wigan, UK
    Car:
    S500L (2002) W220 / SLK230k (1999) R170 / SLK280 (2007) R171 / E320 CDi sport (2007) S211
    yes most other models and makes (e.g 3 series BMW coupe has had this included for years) already have this but for some reason Mercedes did not include this on the SLK until the R171 (mine is the R170).

    as far as i know in the later models that have this such as the R171 the dropping windows operation is performed by the main CPU of the car (eg the N10-3 in the case of the R170) so for obvious reasons retro fitting a module from a later car isnt feasable!

    I have already designed and built the circuit to perform the operation and testing shows it will work well ........I just need to know where i can connect my modules outputs to operate the windows with the IGN off?

    my last resort is to cut the wires to the motors and design a more complicated relay circuit to insert between the motor and the cars CPU to disconnect the motor and drive it directly from my module and have a relay re make the motors connection to the CPU when my module has completed its function, but I really would rather not take that route as it will not be ideal and involve a greater intrusion to the cars wireing and be a lot more messy.

    Mark
     
  12. OP
    OP
    techcareuk

    techcareuk Member

    Messages:
    51
    Joined:
    May 13, 2009
    Location:
    Nr Wigan, UK
    Car:
    S500L (2002) W220 / SLK230k (1999) R170 / SLK280 (2007) R171 / E320 CDi sport (2007) S211
    Circuit Diagram

    can anyone help with a copy of the cars circuit diagram? i could trace how to connect my module then?

    Mark
     

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.