if the red light is flashing on the good fob then VVVVVVVV Unlock car. Sit in drivers seat, shut door. Put key in the ignition, turn key to on then off 3 times. Remove key and press the button on the new keyfob. Central locking should operate. Put the key back in the ignition and turn on/off again 3 times. Once again remove and press the new keyfob button Central Locking should operate again.