My central locking system does not work anymore, i can see the red light flashing on the key but nothing happens. I cannot even lock my doors manually with the key and if i lock all doors from inside I am unable to open the doors unless i open the boot to gain access to the car and the alarm goes on and i must put the key in the ignition for the alarm to stop. As a result my car stays unlocked, but recently when i open my doors the alarm goes on and it does not stop even when i put the key on the ignition.