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How To Electrical :: How to make a replacement key fob for cheap

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How To Electrical :: How to make a replacement key fob for cheap

  #76  
Old 02-12-2019, 10:01 PM
MiniMeep
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Originally Posted by jrmotorsports55 View Post
So, I’ve been messing with this, and researching RFID chips, and I don’t think the copper wound part is the complete chip, only the antenna, which I think is what is causing my issue. I unwound the one that came from my donor key, and it appears to just be a small magnet underneath. I think the actual chip is part of the board, and the coil wires on the antenna connect to it when mounted. For those that have converted non remote keys by popping off the antenna and installing a stand alone chip in it’s place, the stand alone chip is taking over for the board chip which no longer broadcasts its signal without an antenna. Just my theory based on my findings, but I am determined to make this work.
The small 'magnet' that is wound in the copper coil is the chip that you want, when I did my key that is all I transferred across (I think I had to break the coil and did not use it in donor key, that's on my R52 key)
 
  #77  
Old 02-13-2019, 02:33 AM
jrmotorsports55
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Thanks for the reply. What I am saying is that I tried to swap the coil wound part from one remote board to another remote board, and it did not work. I googled RFID chip images, and from what I can tell, the coil wrapped part is just an antenna for the actual chip that has the code and is part of the board. Removing the antenna from the donor board effectively renders that boards chip useless, so adding the sealed chip from a non remote key in its place works. I think there are 2 ends of the coil that connect to the board to connect to the actual chip, as I tried to reinstall my original coil to my original board that started the car before, and it does not work now. I’m going to try to reconnect the wires to the terminals, and see if that works. That will verify if I am on the right track or not.
 
  #78  
Old 02-13-2019, 02:40 PM
jrmotorsports55
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OK, I now feel pretty comfortable in saying that I have proven my theory. I took the good remaining copper wound part and reinstalled it on my original circuit board, this time with the two wire ends contacting the metal holders at each end, low and behold, the key started the car. I did the same thing in the donor chip, it didn’t start the car. This solidified my thought that for the remote keys, the actual chip that has the code is in the board, and the coil wrapped part is just an antenna that connects to the actual chip. Bummer for me as now I have to swap the unlock switches between boards to fix mine, as well as glue the antenna back in and make sure it stays connected. Glad I figured this out.
 
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  #79  
Old 02-17-2019, 08:20 AM
jrmotorsports55
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​​​​​​So, after properly reinstalling the RFID antenna, I started to mess with the broken unlock key. I tried to swap the two known working switches from the used key I bought, and it still does not work. I am starting to think it is a deeper issue and I need to throw in the towel on this remote. I think i’m going to order a new non remote key, and another $9 used remote key, and make a working remote key. I like the idea of this better than buying a new remote key as it is $100 cheaper, plus if the remote fails, I can always swap the contained RFID chip to another used board down the road, whereas the remote keys have the RFID built in and cannot be easily removed. Heading to the dealer tomorrow to place my order.
 
  #80  
Old 02-17-2019, 09:25 AM
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valvashon
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Here's an exploded diagram of the BMW Diamond key, which is essentially what the flat, three button MINI keys are. You will note that the EWS transponder is a board mounted device with 8 pins, unlike the ID44 device in the non remote key. Also, the wire wrapped thing is the EWS pickup and battery charge coil. While pulling that will disable the EWS system, it also disables the induction charging system for the rechargeable battery, so pulling that is not a good idea. If you do a bit of web searching you will find which pins on the EWS to unsolder to render it useless- that's the correct way to disable it if you are going to slip in an ID44 chip from a non-remote key. I remember seeing this somewhere on a BMW board but can't find it at this point.

Val

 
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  #81  
Old 02-17-2019, 09:30 AM
jrmotorsports55
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Thanks! That is a big help!
 
  #82  
Old 02-18-2019, 07:09 AM
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Mineeee
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Do I have it right that if you disable the on board chip and go with a different ID44, you are then in a world of pain to get that particular chip matched to the EMS, unless you buy it direct from Mini and already factory customized to your VIN?
 
  #83  
Old 02-18-2019, 08:28 AM
jrmotorsports55
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It is my understanding that you need to get a programmed chip from mini that matches one of the 10 codes in your on board “reader.” The only way around is if you have the software/tool to reprogram the on board security programmer to input your own codes.
 
  #84  
Old 02-22-2019, 01:27 PM
jrmotorsports55
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Has anyone successfully transplanted their programmed RFID chip from one remote circuit board to another? Wondering if I can just do that to replace the broken remote key that I have that still starts the car.
 
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