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brake switch replaced, shift now stuck ??

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by culpeper, Jan 7, 2013.

  1. culpeper

    culpeper Active Member

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    :(

    Hi there
    My wife’s car 1999 C180 had a break light fault and was on all time. This normally is break light switch, so ordered new and replaced. Now cannot shift auto box from P.

    BAS & ESP came on and off and are now off

    Replaced with old switch to check not faulty switch same problem now with old unit installed, no gear shift, checked all fuses all look ok.

    I have not taken car of drive but also noticed that there is no P on dash and when using pen to unlock shift there is no dash indicator as to gear selected.

    Any ideas.
    Many thanks cheers

    How about this one, my C240 flywheel sensor failed, stopping when hot then ok when cool for short time. Spent 4 hours getting to local garage who said could do it with verbal quote; 4 days later said could not do job, 4 hours to get home. Ordered part and did job my self after ordering correct tools but took 4 days as is a pig to get out and replace plus wrecked hands doing it. LOL :lol:
     
  2. television

    television Always remembered RIP

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    Did you set the switch correctly as the speed signal is now missing or killed somewhere
     
  3. OP
    culpeper

    culpeper Active Member

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    ???? set switch. please explain as all i could find when doing job was remove and replace switch. Cheers:rolleyes:
     
  4. television

    television Always remembered RIP

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    Hard to explain but make sure the switch part is not in to far.

    Colin from MBS explained this very well somewhere on here
     
  5. OP
    culpeper

    culpeper Active Member

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    ok will look for infomation, could not see any setting on switch so must be at peddle will look again. asumed it was a simple push and twist 1/4 turn ani clock wise :D to lock
     
  6. television

    television Always remembered RIP

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    Colin will be online tonight with luck
     
  7. OP
    culpeper

    culpeper Active Member

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  8. mersum1es

    mersum1es Senior Member

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    The probe of new switch must be extracted before installing; it will self adjust when pressing pedal. I think now the sensor does not detect that brake is pushed, and it is not releasing shifter.
     
  9. Alex Crow

    Alex Crow Senior Member

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    Nothing to link the lack of display with the BL switch, more like a selector module failure, which is not uncommon.
    Or, possibly, you have somehow blown the fuse for the module...
     
  10. EmilysDad

    EmilysDad Senior Member

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    Was it from MB? I ask, because the BRAKE light switch for EmilysMum Smart (it's the same switch as some Mercs) came with fitting destructions!
     
  11. OP
    culpeper

    culpeper Active Member

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    How does emilys come with fitting destructions ???
     
  12. OP
    culpeper

    culpeper Active Member

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    Checked fuses but will look again as not sure were it is.
     
  13. EmilysDad

    EmilysDad Senior Member

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    On a piece of A4 ;);) ...... but obviously no idea if it's for the same switch as yours :confused:


    [​IMG]

    [​IMG]
     
  14. OP
    culpeper

    culpeper Active Member

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    Thanks. Mine is spring loaded so asume self adjusted, also lights work when brake used where as before they were on all the time.
     
  15. television

    television Always remembered RIP

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    Just read it again from post 1 and I see that you have no P in the dash.

    The gear sector needs to know the info from the speed signal, the brake lamp switch also relays this info, now I wonder if the faulty brake lamp switch has blown the selector ECU.

    I will take a look to see what is on there
     
  16. television

    television Always remembered RIP

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    I wonder now if the system has just locked up with a fault code, its going to need STAR now anyway
     
  17. television

    television Always remembered RIP

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    Do double check fuse 55
     
  18. Alex Crow

    Alex Crow Senior Member

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    Sorry to correct you Malcolm, and risk the wrath, but...

    The selector does not need a speed signal to display the letter on the dash.
    Yes, it needs a speed signal for the R/P lock and probably other functions, but no reason to look for a speed signal fault here - this is a stuck selector.

    The brake lamp switch definately does not relay any information about speed signals.

    A faulty brake light switch cannot blow the selector, possibly a fuse, but not the selector module.
     
  19. OP
    culpeper

    culpeper Active Member

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    Update:

    Checked all fuses again could find none faulty, as said previous tried pen in slot to unlock shift, however, doing this before I did not try to move car just went through gears. Today decided to drive car by unlocking shift and then found no reverse just seems to pull the revs down but no movement, forward seems to pull but as front is against a wall have not tried driving forward yet, will need to push back to allow me to drive out.

    Have to assume selector gone, shame as car v good nick for 1999 C180 car and was purchased from member on this site 9 months ago.

    Left car for about 10 days having removed old wile waiting for new and cannot believe changing brake light switch caused problem :shock:


    Am I correct selector or any other possibilities ??

    Will look for used or new if cheap enough to replace unit and look at doing my self as I don’t consider large bill from garage to be value for money.

    Many thanks all
     
    Last edited: Jan 9, 2013
  20. Frontstep

    Frontstep Senior Member

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    I'm sure I once found a picture breakdown on fixing a gearbox selector and posted it on here
     

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