I removed both circuit boards from my existing key and the one sent to me, by CitroJim, prior to reprogramming.
An Emergency Key is simply a key blade which will start the car. If you are lucky enough to have one, then you do not need to remove the circuit boards out.
Either way, here is the official factory manual procedure. Copyright Automobiles Citroen. I have added additional descriptions so it is more obvious.
The information emitted by transmitter '9' (key fob) is amplified by receiver '8' (Roof Console IR receiver module) then decoded by locking control unit '1'. (Central door locking control unit).
A locking control unit can be programmed to recognise 1 or 2 remote control transmitters.
Programming and re-programming procedure:
- the vehicle is unlocked
- set the emergency key (simply your key that turns the ignition) to the 'plus accessories' position (ie the first position the key rotates to when turned)
- within the following 10 seconds, press key 'A' of a transmitter, positioning it against the receiver
- within the following 10 seconds, a second transmitter can be programmed; press key 'A' of the second transmitter, positioning it against the receiver.
WARNING: a programming cycle cancels the previous one.
There appears to be no need to hold the button down for 10 seconds as the remote sends the signal within 0.7 seconds ie once the light has gone out, you can put that key (or circuit board down) and pick up the one which needs programming/reprogramming. After 10 seconds, then the second transmitter can be programmed. I am not sure if you can press one button on one key within the first 10 seconds and again on the second key also within the first 10 seconds and still achieve the same result. I followed the exact official factory procedure and it worked. I know a fair few have managed it before and a fair few haven not.
Hope someone finds this useful.