Hi can anyone help on this problem please. I have a 2005 e91 which stopped working on the central locking via the key about a year ago. Finally got round to trying to do something about it and fitted a diversity anntena amplifier unit, unfortunately it's exactly the same. central locking works using the key in the traditional way and also via the button on the dash but not remotely via the key. Does the pcb charge the key and might I need to build a bit more charge in it, does it need coding?.Driving me nuts any help appreciated.