Central locking hi i have an 03 freelander with central locking problems i can only open the driver door with the key the key fob won't open the doors but will set the alarm, i can't open the other doors with the switch inside either or by pulling the internal door handel which would normally unlock them any idea whats gone wrong please help

Turn key twice when opening, ie turn right. once drivers door will unlock, turn twice passengers doors will unlock, and locking is turn anti clock wise once will lock all doors, turn twice will set door dead locks.dead locks will stop openand lock internal button working and handle from opening door. the same actions can be applied to the remote one press drivers door, two press passenger doors, press and hold unlock button for 5 seconds and rear window will open.