After much searching and trial and error I was finally able to programming the central locking buttons on a new key! I couldn't find the exact instructions anywhere but this hybrid, of the ones that I did find, worked for me. (NB: After I did this I swapped the blade and transponder into the new key from the spare key - the one that doesn't have buttons).
NB: Complete the following in under 2 minutes
1- Ensure Ignition is in the OFF position
2- Open Driver’s door
3- Switch the ignition ON and OFF.
4- CLOSE and OPEN the driver’s door TWICE – so door ends up in the OPEN position.
5- Switch the ignition ON and OFF.
6- CLOSE and OPEN the driver’s door TWICE – so door ends up in the OPEN position.
7- Close the Driver’s door
8- LOCK the door using the door lock button on the door.
9- Switch the ignition ON and OFF xTWICE
10- UNLOCK using the door lock button on the door - the doors will then lock and unlock twice to indicate that the car is now in programming mode
11- On the new remote key, that you want adding, press the LOCK button twice - the doors will then lock and unlock to confirm
12- On any existing remote key, that you still want to use, press the LOCK button twice - the doors will then lock and unlock to confirm
13- Switch the ignition ON and OFF to finish
The new key's buttons should now work.
As far as I'm aware this procedure has no effect on the transponder so, even if you get the new blade cut, the new key won't start the car unless you swap in a transponder from a working key - like I did.
I hope this helps someone. If it does, please post the vehicle details.
If you think it could be clearer, please feel free to advise. Thanks
