Nik P

Hi,
I have an issue where the central locking doesn't want to lock. Unlocking I can hear the locks trying but nothing on lock. The alarm is set when you press the fob as alarm activates when you open the door.
At the moment I can lock the passenger door with the pop up button on the door sill, then lock the drivers door with the key before pushing the lock fob button.
When the fob button to lock is pressed the indicators give their normal three flashes.
I have tried another fob and same thing. So unlikely to be fob or battery related as the car starts fine, immobiliser seem ok etc.
The door handles work fine internal and externally.
Boot lid lock seems ok.

I don't want to take the door cards off yet, but try to find a likely issue.

I have looked on the PSCAN and have the following:-
Door Key Switch= off
Drivers sill down= Active
Drivers door sill up= Active
Bonnet switch = closed
Tailgate switch= closed
Passenger door switch= closed
Drivers Door switch= closed

So when I switch the ignition on the only change appears to be the Drivers sill down start changing from Active to in active and back again etc

What is the standard conditions for these readings?
Is the Door sill down changing from Active to in active normal?

I have tried the PSCAN locking function when pressed the locking on status tries the mechanism and after thirty seconds and the "machine gun" affect takes place before I switch to the locking off setting and it returns to normal. The pop up sill buttons don't move.?

Any ideas would be gratefully received.