Another E46 nackered key post - sorry!

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  1. Another E46 nackered key post - sorry! 
    #1
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    Hi guys, been a while since I was on here, but I've just got back into BMW ownership! I've got a lovely 51 plate 320d with 105k on it. Love the car but it has come with a few niggles. The most annoying being the dreaded key fob issue! I only have 1 remote key and 1 normal key, and someone has tried to fix the remote one by cutting it open and replacing the rechargeable battery with a standard one. I don't know if they tried reprogamming it or not, but needless to say it didnae work!

    I've tried replacing it with a new rechargeable battery but with no success.

    So my question is, can I buy a second hand key off of ebay and fit the circuit board to my blade then reprogram it so that it'll work in my car?

    I've looked over a few forums but can't find a definitive answer.

    Thanks in advance.

    P.S. The drivers door central locking actuator doesn't work either, would that make a difference to trying to reprogram the key I have?
    Victory is mine!!!
     
     

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    Have you tried the syncing procedure?
    If the synchronisation is lost, it'll need redoing. You won't be able to just just another key innards unless you unsolder and swap a small chip inside that holds the EWS immobiliser data.
    The Immobiliser and the central locking parts are two separate parts of the keys job.
     
     

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    basskove (22-10-2012)

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    Tried synching with no joy. It seems kaput. Thanks for the info though, looks like I need a new one from the stealers. Or just put up with using a key to get in.
    Victory is mine!!!
     
     

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    Does the remote one work and start the car?
    If it does, you can get a used inner PCB, and find someone who will be able to swap the chip containing EWS data, any place that would do mobile phone repairs, or laptop repairs would be able to swap the chip over which would be a decent saving over a brand new key.
     
     

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    sounds like the last owner had a issue with it not working and tried to replace the battery, bit of a error as these keys charge when in the ignition. The stealer will charge you £98 all in for a new key, they order them direct from the factory and are pre-programmed to your cars ecu, they just perform a simple procedure to get the car and key to work together. If you go down this route go straight to the parts department in the dealership don't bother with service they will try and tell you they need it in to code the new key, they don't the guy from the parts desk came out to my car and did it in a minute.
     
     

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    The remote one will start the car, so I might get myself a second hand one. Trouble is I live on an island and I don't think anyone here does anything like that. I do go to the mainland a lot though, so will give it a go. Thanks again!
    Victory is mine!!!
     
     

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    10030A.jpg

    Clcik to expand - that's the chip that holds your EWS immobiliser data, so if you can swap that into a used but working PCB, it'll then start the car, and you'll then be able to sync the remote part too.
     
     

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    That's great stuff. Thanks a lot! I am kinda confused as to A- how the car charges the battery in the remote key as I can't see any contact points from the blade, and B- Does my non remote key have a chip in it as well. These are just out of curiosity. I like to know how things work
    Victory is mine!!!
     
     

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    That copper coil is an induction loop. The pickup ring around the ignition barrel induces a current which will power the EWS chip and recharge the battery.
     
     

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    Quote Originally Posted by TheEnd View Post
    Attachment 42449

    Clcik to expand - that's the chip that holds your EWS immobiliser data, so if you can swap that into a used but working PCB, it'll then start the car, and you'll then be able to sync the remote part too.
    as TheEnd said this is the chip that will work with your ews. unsolder and resolder onto a used pcb board and reprogram for locking.

    Quote Originally Posted by basskove View Post
    That's great stuff. Thanks a lot! I am kinda confused as to A- how the car charges the battery in the remote key as I can't see any contact points from the blade, and B- Does my non remote key have a chip in it as well. These are just out of curiosity. I like to know how things work

    you see that copper wirer thing thats is what chargers the key, car send small charge to key , copper thing picks it up and chargers battery. if your none remote key starts the car then yes, but it will be something like a id44 chip. i can unsolder the chip and replace it onto a used pcb for you , also do you a whole new key programmed to your ews. TheEnd this is why im learning about the ews m8 in another post. im able to make new keys programmed to the ews so no need to pay bmw prices
     
     

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