Replacing a blank

Discussion in 'Electronics' started by Scorcher, Sep 27, 2008.

  1. Scorcher

    Scorcher Hardcore MB Enthusiast

    Messages:
    203
    Joined:
    Mar 26, 2008
    Location:
    South Croydon
    Car:
    2004 E55 AMG
    Can I replace this blank with a button?

    [​IMG]


    If so, any ideas on a part number and or cost?

    Thanks!
     
  2. whitenemesis

    whitenemesis MB Club Veteran

    Messages:
    15,832
    Joined:
    May 7, 2007
    Car:
    Lexus RC300h F-Sport 2019
    If the E is anything like the 203 those buttons come as a set. You can't buy them individually :crazy:

    I have a couple of blanks in mine but would have to get a complete new switch bank @ £164
     
  3. corned

    corned Hardcore MB Enthusiast

    Messages:
    3,894
    Joined:
    May 2, 2008
    Location:
    Living in error with Maude at Cap Ferrat
    Car:
    car
    Depends on what the problem is?

    Are you concerned about the look of the switchpack - i.e. something looks to be 'missing'? Or do you have a purpose to which a switch could be put?

    I've got the estate, so this blank is filled with a rear wash/wipe switch. You could always rig up some rear wash/wipe installation on your saloon... :)
     
  4. OP
    OP
    Scorcher

    Scorcher Hardcore MB Enthusiast

    Messages:
    203
    Joined:
    Mar 26, 2008
    Location:
    South Croydon
    Car:
    2004 E55 AMG
    I have a use for it - next major mod needs to be switchable :cool:
     
  5. whitenemesis

    whitenemesis MB Club Veteran

    Messages:
    15,832
    Joined:
    May 7, 2007
    Car:
    Lexus RC300h F-Sport 2019
    Intresting....;) :)

    But as these switches are coded (I think so any way) it might be difficult to use one for another purpose?
     
  6. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
  7. Nibbo

    Nibbo Hardcore MB Enthusiast

    Messages:
    594
    Joined:
    Mar 22, 2005
    Location:
    Gloucestershire
    Car:
    C180K Estate
    Ooooh... lets all play guess the mod

    Nitrous?

    Ejector Seat?

    :D
     
  8. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    Hope he remembers to order the one for Right hand drive.
     
  9. OP
    OP
    Scorcher

    Scorcher Hardcore MB Enthusiast

    Messages:
    203
    Joined:
    Mar 26, 2008
    Location:
    South Croydon
    Car:
    2004 E55 AMG
    Nope!
     
  10. Diesel Benz

    Diesel Benz Hardcore MB Enthusiast

    Messages:
    4,064
    Joined:
    Feb 3, 2006
    Location:
    Europe
    Car:
    222.132 & 221.122 & 213.050 & 906.633
    I'm afraid I'm equally pessimistic as whitenemesis that this would work. I believe the blind switch is for the rear window blind. All of these are anyway most likely read by a switch reading matrix by the control unit, then if the switch is pressed, the blind is operated through a CAN bus message to the rear SAM.

    If the switch was built to directly power some individual target, it would be easier to access the switch poles. Now there must be a printed circuit board with buttons on a matrix and it may be impossible to cut the wires for this switch as that would cut the connection to the next switch. Some cutting and jump wires could make it, unless the circuit board is a multilayer board.

    The switch would not handle high currents but you don't mention if your application would manage with a control signal only. If you are very lucky, it could even work but likely needs a lot of effort.

    But if you build a CAN bus decoder and code the rear window blind existing on the car, you would get the switch info "easily" by tapping to the correct CAN bus.
     
  11. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    The switches are probably built up as part of a matrix with different resistances feeding and returning different voltages to the controller.
    As you say the power will pass through an individual switch, but there's no reason a flylead couln't be added to either the switch or the return line and onto a suitable low voltage control.

    It needs investigation.
     
  12. richard

    richard Authorised Forum Sponsor Authorised Forum Sponsor

    Messages:
    6,018
    Joined:
    Jun 10, 2002
    Location:
    Berkshire, UK
    Car:
    MY04 SL55, MY18 GLC63s
    The switch pack is basically only on the car's CANbus, so all buttons send signals (that the SAMs pick up) and then turn on/off the appropriate outputs of the SAM etc

    As Diesel Benz says, the switch is for the rear blind, which connects to the rear SAM.

    So, why not use the Rear SAM outputs for the rear blind to control whatever needs controlling ? Rear SAM/ EIS may need telling there is an electric blind from star to enable them though.

    The rear blind is controlled with 2 outputs (pin 1 and 2 on connector 25) a 7.5A fuse (Fuse 20) and ground - Outputs 1 and 2 feed a relay pair for the rear screen blind for up and down. (as the motor needs to be powered one way round or the other for up/down). The relay pair is probably in one single relay block and I dont know where exactly it is but its not in the SAM itself.

    The rear screen blind wiring harness is A211 540 41 06 (about £38) and i'd start with that as it will have the correct connectors on it for the rear SAM and give you a useful 7.5Amp power feed since you dont want to rely on the SAM outputs providing much power.

    Also, i would deconstruct the switch block to see whether the switch mechanism is there and the button only needs tweaking to make it into a button as suggested.

    The switch pack ("upper control panel") at the front are probably different between LHD and RHD so be careful if ordering a replacement switch pack.

    Richard
     
  13. OP
    OP
    Scorcher

    Scorcher Hardcore MB Enthusiast

    Messages:
    203
    Joined:
    Mar 26, 2008
    Location:
    South Croydon
    Car:
    2004 E55 AMG
    I just bought this on eBay.com to cannibalize :D

    [​IMG]

    Think I'll get the basic wiring done by my mechanic to the switch provided, in a temporary location and then get a nice man in Woking to do the tricky bits :D
     
  14. Nibbo

    Nibbo Hardcore MB Enthusiast

    Messages:
    594
    Joined:
    Mar 22, 2005
    Location:
    Gloucestershire
    Car:
    C180K Estate
    Please tell me what will the switch do?
    I can't sleep until I know.
     
  15. verytalldave

    verytalldave Hardcore MB Enthusiast

    Messages:
    3,595
    Joined:
    Aug 26, 2007
    Location:
    Bromley, Kent
    Car:
    W203 C200K Cubanite
    PS..............Note to self.........

    Must buy some screen wipes (!)
     
  16. OP
    OP
    Scorcher

    Scorcher Hardcore MB Enthusiast

    Messages:
    203
    Joined:
    Mar 26, 2008
    Location:
    South Croydon
    Car:
    2004 E55 AMG
    It's a frosted finish :D
     
  17. Smatt

    Smatt Hardcore MB Enthusiast

    Messages:
    1,192
    Joined:
    Jul 2, 2008
    Location:
    Norfolk
    Car:
    2011 E350Cdi Cab Auto, 2011 E350Cdi Estate Auto
    This has been investigated by a member on one of the american sites in some depth for a facelft W203, even getting a replacement switch specially injected & made with a choice of his own symbol on
     

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.