DIY: Replace rechargeable battery in Key FOB

TTGator · 10-22-2019, 03:15 PM

Replaced the rechargeable battery in a 2014 E84 (non-comfort access) and made a DIY. The lock/unlock buttons still do not work after this, but the key will start the car. Looking for suggestions from others on how to get this functionality back. I've tried several things I've read online with no success so far...

https://youtu.be/ZGdyGKCn0R0

Roch M4 · 10-22-2019, 08:38 PM

Check the connections between the buttons on the keyfob and the circuit board, these can get dirty and the small buttons on the key fob may no longer work. Try to activate them manually without the keyfob. I don't understand why they stop functioning after replacing the battery

Roch M4 · 10-22-2019, 08:42 PM

Check the antenna, it's maybe the cause of your central locking problem

TTGator · 10-22-2019, 09:12 PM

Tried the buttons manually. Nothing. I have a second FOB that works fine so not the antenna

YoungJM · 02-02-2021, 08:51 AM

Needing to replace the battery on an E84 non comfort grip fob but don't want to open the fob until the battery is ordered (since the key is still working). I'm understanding that it needs to be a VL 2020, but sites (Amazon, Ebay, etc) don't list E84 as a compatible match. Can anyone tell me if this is the correct battery?

10-22-2019, 03:15 PM	#1
TTGator Banned 246 Rep 282 Posts Drives: 2015 BMW M4 Dinan S3 Join Date: Oct 2013 Location: Kernersville, NC iTrader: (0)	DIY: Replace rechargeable battery in Key FOB Replaced the rechargeable battery in a 2014 E84 (non-comfort access) and made a DIY. The lock/unlock buttons still do not work after this, but the key will start the car. Looking for suggestions from others on how to get this functionality back. I've tried several things I've read online with no success so far... https://youtu.be/ZGdyGKCn0R0
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10-22-2019, 08:38 PM	#2
Roch M4 I /// M FAN 424 Rep 427 Posts Drives: M4 SS/SO 2016 / X5M C 2023 Join Date: Sep 2016 Location: Montreal iTrader: (0)	Check the connections between the buttons on the keyfob and the circuit board, these can get dirty and the small buttons on the key fob may no longer work. Try to activate them manually without the keyfob. I don't understand why they stop functioning after replacing the battery
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10-22-2019, 08:42 PM	#3
Roch M4 I /// M FAN 424 Rep 427 Posts Drives: M4 SS/SO 2016 / X5M C 2023 Join Date: Sep 2016 Location: Montreal iTrader: (0)	Check the antenna, it's maybe the cause of your central locking problem
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10-22-2019, 09:12 PM	#4
TTGator Banned 246 Rep 282 Posts Drives: 2015 BMW M4 Dinan S3 Join Date: Oct 2013 Location: Kernersville, NC iTrader: (0)	Tried the buttons manually. Nothing. I have a second FOB that works fine so not the antenna
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02-02-2021, 08:51 AM	#5
YoungJM Registered 0 Rep 1 Posts Drives: 2013 BMW X1 Join Date: Feb 2021 Location: Arkansas iTrader: (0)	Which battery to use? Needing to replace the battery on an E84 non comfort grip fob but don't want to open the fob until the battery is ordered (since the key is still working). I'm understanding that it needs to be a VL 2020, but sites (Amazon, Ebay, etc) don't list E84 as a compatible match. Can anyone tell me if this is the correct battery?
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