Diamond key replacement batteyr DIY (NO 56K)

To BMC350i. Your prob has nothing to do with your repair (congratulation btw for a successful DIY).
What you need is to recode your Car/Key memory using NCS Expert.

Originally Posted by ilhb

WARNING!
What you get with this is that you wont be able to start your car next time your key runs out of battery.
This coil is used to get energy to the rfid that unlocks the electronic blocking system. When you plug in the key, a signal is sent to the key by the car and the key sends a signal back to the car using part of the energy contained in the signal sent by the car. This energy is collected using, correct me if I'm wrong that shame coil you are removing.

Thanks for the post.

Everything what you said will be correct ONLY for cars after 2000! but I`ve made this DIY for cars from 1996-2000 !!! My key still working great and it was already over 2 years!!!!!!!!!!!!!!! + when battery will die I`m will replace battery with new one easy and quick

Here is a composite that I made from the information in this and other threads, expressly to help explain the diamond key replacement particulars for others, long after we're gone.
(Let me know if it's missing any critical detail.)

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EDIT: Removed pointers and screenshots to www.bmwgm5.com/KF_WoS.htm as per PM from scottjoh.

Hi,

New here, first post of hopefully many.

First question -

Purchased a second hand 318 with no working remote.

The key was all taped up, and once cutting through it all I can see why it doesn't work (picture).



I am in the UK and this is a 433.92 MHz key.

Looking back through this thread I can see that a previous post stated the component (on the left as you look at the picture), is a 22nH coil for a 315MHz key. The post is specific as to the key frequency, so does anyone know what it would be for a 433.92 MHz key?

The component on the right looks to be a capacitor, but what value?

Also the battery was floating around and two of the micro-switches don't work, so they really buggered this one up.

Finally, will this pcb board work in a new key if I get one cut (it's really knackered looking), or is there anything within the plastic molding which assists with the immobilizer?

Thanks all for any advice.

Originally Posted by seventysix

The component on the right looks to be a capacitor, but what value?

You might do well by sending the key off to Scott at http://www.bmwgm5.com/key_repair.htm

Originally Posted by bluebee

You might do well by sending the key off to Scott at http://www.bmwgm5.com/key_repair.htm

unfortunately this is my only key! and being in the UK...

Just need to know the values of the inductor and the cap, I've looked for circuit diagrams but have had no luck

Originally Posted by seventysix

Just need to know the values of the inductor and the cap, I've looked for circuit diagrams but have had no luck

Well, looking at the pictures on this thread, after zooming, I can't even tell 'what' they are (neither looks like an inductor, for example).
Both seem to be connected to the antenna; however, circuit boards can be many levels deep, so all we can 'see' is the top trace.