Morning
As I understand/remember it the door lock has to match the key and using the key in the door lock sync's the key with the EWS
As for registering the key sometimes they can be uncooperative little so and so's. As you don't have the keys already registered can you clear the memory and start again ?
I have a document covering the Central Body Electrics and comm's digging for it now, Just reading it looks like a max 4 keys if I understand it you have to clear some space for the new keys491496552_Tab7CentralBodyElectronicsZ.pdf
Hope this helps
Dave
491496552_Tab7CentralBodyElectronicsZ.pdf