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Old 08-18-2011, 01:01 AM
ilhb ilhb is offline
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Location: Europe
Join Date: Aug 2011
Posts: 1
Mein Auto: 530d

Originally Posted by bluebee View Post
For cross reference, a DIY thread opened up today which shows how to convert the old (1996 to 2000) square key to a diamond key.
- DIY - easy way to make a brand new diamond key work in your older car (96-00)

In that DIY, you remove the rechargeable battery and replace it with a standard coin battery:
  • 3 volt Panasonic VL 2020 lithium coin cell battery (rechargeable)
  • 3 volt Walmart CR2016 (non rechargeable)
You also remove the charging coil (and reputedly a hidden transponder underneath all those wraps of wire).

If anyone has an old key they can do an autopsy on, it sure would be nice to figure out if there really is a hidden transponder underneath all those coils of copper wire!
- Is there a "transponder" underneath the copper wire in the diamond key inductive coil

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.
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