Save £100 By Fixing Your Key Fob

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  1. Save £100 By Fixing Your Key Fob 
    #1
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    yahoo1918's Car Details
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    Hi

    Well as most of us know BMW will have us believe the batteries cannot be replaced and instead have to part with £100 ish for a new key fob.....read on, there is a way of changing the rechargable battery

    First Pic: Original Key

    Second Pic: Take a stanley or xacto knife and basically carefully cut the key open along the seam where the top and bottom joined...Start at the top where the keyring goes through and be careful not to go too deep and damage the insides.

    Third Pic: Next take small chisel and brake the spot welds on the battery that connect it to the rest of the circuit board.

    Fourth Pic: The battery you will need is a Panasonic VL20203v.It is then a simple matter of soldering the new one in and making sure everything fits back together. (remember to put the positive and negative the right way round)

    Fith Pic: Unit superglued back together

    Then reprogramme:

    Put the working key in the ignition. Turn to position 2 for like 1 second then back and remove the key.

    Press and hold the "unlock" button then press the "lock" button 3 times, you should hear all the locks cycle through.

    Now take the non working key and press and hold the "unlock" button then press the "lock" button 3 times.

    Then turn the ignition on and off again to end the programming.

    ##A few things to remember##

    Worth a shot only if its your spare key that is not working, you have nothing to lose (apart from a £6 battery). Would not advise you do it if you only have one key (as you may not be able to use the key at all if you make a mistake).

    Be careful when opening the sealed key not to slice your fingers too much

    Before glueing back together, tightly band the key back together first and test it

    Finally

    I cannot take credit for this instead it goes to Jason 77 in California Big thanks I believe form all of us, its going to save some of us a lot of money.

    This is not guaranteed to work as your fob may be faulty and a replacement battery will not solve this.

    If it is your battery that is the problem and you do it correctly it will work.

    I have a battery on order and will post back in a week or so once I've given it a shot
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    Yeah, I did this a couple of weeks ago with the Sigma system that came with my car. I asked my local BMW dealer directly if the alarm beeper could be re-housed in a new fob shell, and was told no. Unsatisfied with this response, I then came on here and asked what those in the know thought, and was told it COULD be done and would be cheap and easy. £14 and quarter of an hour later, job done. Thank you bimmerforums!

    Good info yahoo1918 & Jason 77 in California.
     
     

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    Great post Yahoo

    That sums up the job nicely and i think it deserves a sticky in the 'How To' forum ??

    What do you guys think?
     
     

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    jays1971 (22-04-2009)

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    Quote Originally Posted by boostist View Post
    Great post Yahoo

    That sums up the job nicely and i think it deserves a sticky in the 'How To' forum ??

    What do you guys think?
    Agreed.
    .
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    De Omnibus Dubitandum
     
     

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    Quick update.......

    Finally got round to giving it a go and guess what.........got a second working key again all for £6 or so

    Did it exactly as described above but would add that when it comes to testing the key put it in the ignition and go for a drive to charge it up. For some reason by leaving it in the ignition without the engine on it wouldn't charge it.

    There are a couple of different batteries out there but I bought this one:

    http://www.cellpacksolutions.com/Sea...ID=VL2020-1HFE
    Last edited by yahoo1918; 05-07-2008 at 21:19.
     
     

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    Quote Originally Posted by yahoo1918 View Post
    Quick update.......

    Finally got round to giving it a go and guess what.........got a second working key again all for £6 or so

    Did it exactly as described above but would add that when it comes to testing the key put it in the ignition and go for a drive to charge it up. For some reason by leaving it in the ignition without the engine on it wouldn't charge it.

    There are a couple of different batteries out there but I bought this one:

    http://www.cellpacksolutions.com/Sea...ID=VL2020-1HFE

    Nicely done mate
     
     

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    tried this as well today ,

    bit fiddly soldering the new batt in but eventually managed ,
    All programmed up and working spot on
    Just need to superglue the 2 halfs back together now

    cheers guys
    Ian
     
     

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    jays1971 (22-04-2009)

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    Quote Originally Posted by bandit890 View Post
    tried this as well today ,

    bit fiddly soldering the new batt in but eventually managed ,
    All programmed up and working spot on
    Just need to superglue the 2 halfs back together now

    cheers guys
    Ian
    Glad to hear it worked.....helped 2 of us so £200 saved so far
     
     

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    Hi guys, just registered on here, to ask how to programme a new key, as we're in the process of buying a spare key on e-bay. Found this thread and will try it...

    Thanks in advance for this advice!!!
     
     

  17. Key Fob for a (E34) 
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    I have a key fob that sends a radio signel its a squre or oblong fob with a red button and a gray one is there anyone out there that knows how to re-set the system. the fob operates the central locking and the alarm.Any help would be very welcome. Thanks
     
     

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