You either have a faulty central locking motor or the wiring harness may be damaged.
Remove the door panel and check if you have a live feed to the central locking motor when you use the fob to lock or unlock. If you have power, then it will most likely be the motor that is at fault.
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How are you trying to open the door , button on key fob ? With this system you can pull up on the drivers handle an it activates
Antennas in the external side door handles (C30/C70 front doors, S40/V50 rear doors)
Antennas in the passenger compartment and cargo compartment
An antenna in the rear bumper
Quick lock motors in the lock units in the side doors
The remote keyless entry (RKE) receiver receives a signal from the key
The switch in the clutch pedal (manual transmissions) or a signal from the brake pedal switch via the central electronic module (CEM) (automatic transmissions)
Switch in door handle and lock button on handle .
If a door handle is pulled outward, a switch closes that wakes up the system and activates the antennas in the handles on the side where the handle has been pulled out. If a valid key is within a radius of approx. 1.5 metres from the handle, the relevant door will open and the vehicle will unlock one or several doors. Which doors are unlocked depends on the settings for the system. The vehicle can also be unlocked if the handle is affected on the tailgate.
Try this trick, push the lock button once your in the car to unlock first then lock then unlock again, your kill switch is activated as anyone could unlock the door with a key, but to be linked together via bluetooth remote is exclusive and good practice if you choose to stop a thief
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.
Had same trouble with my 406, fixing no problem, with new battery in fob, insert into ignition, turn key, BUT DO NOT START ENGINE, hold button for about 10 seconds release button and remove key from ignition, then try and see if doors lock on remote, if not try again, had to do this a couple of times, and it worked, sorry to say that now my key fob button has completely fell apart, through ware and tare
Its dirty, rusted or the rivets are coming loose. Open up clean and spray a little oil. If that does not help. Take a hammer and after removing the whole lock resecure the rivets with the hammer. IT MAY ALSO BE THAT YOUR BATTERY IS NOT STRONG ENOUGH ANYMORE AND SHOULD BE CHECKED.
Happened to me after first purchasing my 850 - check the fuse for the CLS, as mine (for some reason) was too narrow, and was jostling about. Once I changed it out for a new fuse, no problems at all (I performed this fix a year ago, and no problems since).