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Single button Key Fob W210 E200

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by molly, Oct 15, 2012.

  1. molly

    molly Senior Member

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    They say lightning doesnt strike twice - Well believe me it does. My Key fob has stopped working on my E200 hence arming the immobiliser.(I have changed the batteries - Still no good)

    This happenend to me few years back and I ended up buying a new keyfob from the main dealer pretty expensive at the time few hundred I do recall.

    I have taken the key fob case apart to have a peep at the pcb and there is no signs of anything loose so I dont believe there is an easy DIY fix.

    What I would be interseted to Know is - Is there any way of disarming the immobiliser - If I could get the car started I Would use the flip key to open door/boot etc and not bother with FOB ?

    Also - I see there a Key Fobs for sale on ebay obviously the key blade would have to be changed but would there be a problem programming the key ?

    :(
     
  2. television

    television Always remembered RIP

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    The tracking can go open circuit that stops the fob from working, if it is working you will see the beam in a camera.

    The circuit board use through hole plating and these can fail, it is possible to find the breaks with an ohmmeter, the track that leaves the battery contact pad also goes open circuit
     

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  3. OP
    molly

    molly Senior Member

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    Thanks Malcolm - I can confirm that I can see the beam through a camera.

    I can also see the beam through the camera even when the button on the fob is NOT pressed - Is this normal ?
     
  4. Dec

    Dec Senior Member

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  5. television

    television Always remembered RIP

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    If the key is sending without a button pushed that is not right and it will flatten your battery in the key, it must be assembled wrong, what year is the car please
     
  6. OP
    molly

    molly Senior Member

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    1996
     
  7. television

    television Always remembered RIP

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    So a single button with the flip out key, and no transponder circuitry,,, yes now I know what key you have, this one can drift off tune, and a new one is the only way, they cost about £175 from MB
     
  8. OP
    molly

    molly Senior Member

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    Thanks DEC

    My Ignition is like the second Picture - Interesting point about the solder joints I will try that Tomorrow and see what that brings - When Ive the circuitboard in my hand with only the 2 batterys connected without pressing the switch I am getting a light - This should not be
     
  9. Dec

    Dec Senior Member

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    Correct, should be no light if not pressed, I think one of the two keys in that video has the same fault as yours as the light is on all the time.
    It seems to me that the button has failed while the car was in the locked state and therefore the car is immobilised… so getting the button to work just one more time (inside the car and pointed at thee receiver) should release the immobiliser.

    If you do get it started, don’t use the remote again until you get the remote fixed properly, use the key blade to lock/unlock the car.

    That key almost certainly can be fixed by someone experienced in soldering or by the likes of a TV/Computer repair shop.

    Dec

    Edit; See also, Fob Repair here… http://forums.mercedesclub.org.uk/showthread.php?t=26895

    [​IMG]
     
    Last edited: Oct 15, 2012
  10. OP
    molly

    molly Senior Member

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    Luckily this morning ater much manipulation with the fob I disarmed the Immobiliser Phew ! At least I am mobile and lock doors with Key as suggested



    I will not deploy the fob from here on - but is there any chance that the Immobiliser could recactivate itself back to having the imobilsier on again which is my biggest fear - Undecided whethet to buy a new fob or not Quoted €400 this morning
     
  11. television

    television Always remembered RIP

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    Why not let someone fix the key properly, it is a flip flop circuit from the remote
     
  12. Dec

    Dec Senior Member

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    That proves that… in the right hands… the remote is repairable, the Tactile switch is most likely stuck on, it can be replaced, in the mean time keep the batteries out of the fob and do any testing/repairs well away from the car so you don’t enable the immobiliser again until you are sure the remote fob is working properly and reliably.
    I don’t think it can reactivate again, not until someone presses the remote button once again with the batteries in the remote.

    Tactile switch examples... http://www.google.com/search?q=tact...YBQ&biw=1311&bih=841&sei=ASl9UKi4CtKRhQfKo4BQ


    That £400 is definitely not right, check else where, I’ve heard around £180/£190 for a flip out key, mind, it is a good idea to have a spare.
    Key Fobs for sale on eBay cant be programmed for your car, the are sometimes useful for spare parts or for there shell/case.

    Dec
     
  13. television

    television Always remembered RIP

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    I paid about £175 for a 3 button flip out, the older one should be a tad cheaper
     
  14. OP
    molly

    molly Senior Member

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    Many thanks gentlemen for endeavouring to ease my pain - I will attempt to have it repaired by someone more qualified than I and also seek a new quote for a new fob.
     
  15. EmilysDad

    EmilysDad Senior Member

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    Indeed! :rolleyes: Molly is in Ireland & the quote was 400 Euros ;);)
     
  16. Dec

    Dec Senior Member

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    Thanks, I thought the €400 was pounds and didn’t spot that its Ireland so it won’t surprise me if €400 is correct.
    Its just ridicules here the cost of that key compared to the UK, €400 is about £320. It will be interesting to know what the best quote is, let us know the outcome.

    Get the tactile switch replaced as the existing one is too unreliable.

    Dec
     
  17. toby1

    toby1 Senior Member

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    That's an obscene price. MB should be ashamed
     
  18. nekomata

    nekomata Member

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    Hi Molly
    I appear to have a similar problem to yourself and was wondering if you found any particular techniques for getting the remote to trigger.

    Thanks for any tips you can give,
    Stu
     
  19. OP
    molly

    molly Senior Member

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    Sorry to hear your in trouble.

    In order to dis arm my immobiliser I just kept pressing on/off on/off with the fob pointed towards the rear view mirror until the central locking popped. As outline in Dec's post Its most likely that the tactile switch is malfuntioning in mine because the infra red beam is on 100% of the time which is incorrect - It should only appear when the buttom on the fob is pressed.

    I assume that You have looked at all the replies on this thread as there are very good replies by Dec and Malcolm (Television) .

    Good luck - Hope You make progress
     

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