24-08-2020, 03:50 PM
Welcome to the club! 
A 1999 phase 3 306 will have the RF (radio) controlled remote central locking rather than the earlier IR (infra red) system. I have never had to deal with an RF system so don't know much about them. I'm sure there will be quite a bit on the web though. This might help https://www.306oc.co.uk/forum/showthread.php?tid=32561
Keep us updated on any fix or any info you find.
A 1999 phase 3 306 will have the RF (radio) controlled remote central locking rather than the earlier IR (infra red) system. I have never had to deal with an RF system so don't know much about them. I'm sure there will be quite a bit on the web though. This might help https://www.306oc.co.uk/forum/showthread.php?tid=32561
Keep us updated on any fix or any info you find.