Hi all back again (run away.... :blink: ), droped in to see bmw delalers today and the model i have does not have a alarm fob it has a chip built into the key wich acts as imobliser and works when turning into ignition. BMW EWS System. But forgot to as about central locking Doh.... so reading haynes manual it talkes about an arming system that works when you lock the doors and after digging around found that all this is running through a ZKE IV unit. This seems to run everything elec windows, central locking, sunroof. As all cental locking and alarm is dead i just wonder if there is a problem with this unit and if so is it coded to the car or is it easy to interchange?