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Thread: F10 key fob battery replacement

  1. #1
    Join Date
    Jun 2021
    Location
    iceland
    Posts
    10
    My Cars
    BMW E34 540i 1994

    F10 key fob battery replacement

    Hello
    I got a 2016 f10 and the car came with the warning to replace battery in key
    now I’ve tried two different types of battery and the car still tells me to replace battery
    what could be wrong?
    I have two keys and both comes with this error message

  2. #2
    Join Date
    Sep 2010
    Location
    Victoria, B.C., Canada
    Posts
    49
    My Cars
    2015 535i M-Sport
    BMW key fobs are specific for their battery --- CR 2032 --- and this is what most car key fobs use. What did you install? I also assume you put them in correct side up.

  3. #3
    Join Date
    Jun 2021
    Location
    iceland
    Posts
    10
    My Cars
    BMW E34 540i 1994
    There was cr2450 in the key fob so I used the same, bought two different types of battery and neither did a thing, and yes correct side up

  4. #4
    Join Date
    Jun 2021
    Location
    iceland
    Posts
    10
    My Cars
    BMW E34 540i 1994
    I’ve tried to hold the key fob against the steering column, still get the error message
    ive tried to clean and push the pins a little bit up, still get the error message
    the key does work, it opens the car and closes, and starts
    just get the really annoying error for a few secs in the dash and HUD, no error in the check control
    the error message only comes when I get in the car and start it, then goes away and then comes back when I turn the car off

  5. #5
    Join Date
    Sep 2010
    Location
    Victoria, B.C., Canada
    Posts
    49
    My Cars
    2015 535i M-Sport
    How to Reset a BMW Key Fob

    • Stick your key in the ignition.
    • Turn it to the on position.
    • Then, turn it off.
    • Next, remove the key.
    • Finally, hold the unlock button on your key fob as you press the BMW logo button 3 times. Then, let go of the unlock button.


    Or said another way:

    Take the BMW key fob you wish to program and hold down the unlock button while pressing the BMW logo 3 times before releasing the unlock button. Once again the doors should lock and unlock. When this happens, you are all set!






  6. #6
    Join Date
    Jan 2004
    Location
    (northeast) Indiana
    Posts
    19,321
    My Cars
    15 650ix GC & 14 X5 50i
    Quote Originally Posted by trian View Post
    How to Reset a BMW Key Fob

    • Stick your key in the ignition.
    • Turn it to the on position.
    • Then, turn it off.
    • Next, remove the key.
    • Finally, hold the unlock button on your key fob as you press the BMW logo button 3 times. Then, let go of the unlock button.


    Or said another way:

    Take the BMW key fob you wish to program and hold down the unlock button while pressing the BMW logo 3 times before releasing the unlock button. Once again the doors should lock and unlock. When this happens, you are all set!


    The OP has a 2016 5 series…his car doesn’t have an ignition to insert a key.


    The instructions posted in the quote is for keys that look like this:


    To the OP, what battery brand are you using? Make sure there ins’t a protective covering on the back of the battery…or a sticker that tastes nasty to prevent small children from eating them as if they were a piece of candy.

    Last edited by Qsilver7; 01-10-2023 at 06:38 PM.
    Become a BMW CCA member! Click HERE to join and feel free to use my BMW CCA member #191509 as a referral.

    2015 650ix GC (Moonstone/Cohiba Brown) <<~>> 2014 X5 50i (Space Gray/Mocha)

  7. #7
    Join Date
    Jun 2021
    Location
    iceland
    Posts
    10
    My Cars
    BMW E34 540i 1994
    The key fob had a CR2450 battery, I bought that. I also have 2032 but it’s to small for the key fob

  8. #8
    Join Date
    Mar 2006
    Location
    Gig Harbor, WA
    Posts
    342
    My Cars
    2001 740i Sport, 1995 M3
    For what it's worth, my research has shown that our cars of different years have had both 2450 and 2032 batteries in them. I popped our key open to replace the battery and was surprised to see the 2032. Put a new 2032 in and it works perfectly. I was confused at first as a web site I found clearly said the key should have a 2450 in it. Not possible as a 2450 is much bigger than a 2032.
    Aaron

    Current
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    '10 - 128i Convertibel - sold
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