I have a Vectra 1.8 and for some reason the car alarm has suddenly stopped working, but the central locking works ok. I have changed the battery in the remote control for the alarm. Is there a special code or something i can do to reset the alarm and get it working again. Because i have heard that in some cars if you keep pressing the remote the alarm needs resetting, i dont know how true this is. If any one can offer any help i would be eternally grateful. TIA Ron