noisy central locking

[parcelman]

this fault has just come on today,i have a rapier 2002 saloon,when i go to lock the car the loud machine gun noise coming from the passenger door is unreal,since this problem has occured the car wont lock properly,i have to lock the front passenger door manually(still making noise)and the rest of the doors with the key fob.
ive had the door card of and the noise is coming from what i call the motor with a 9 pin connector on it,it sounds like a bloody tommy gun,firstly what is this part called,are they easy to fit,is this a common fault.any advice on this problem would be appreciated

[PeterN]

The noise is probably the door locking and unlocking in quick succession, this is often caused by one of the locks sticking, make sure they all move freely and squirt a drop of oil in them if they don't.

Peter

[markw]

Does your car have 'Total Closure'? ie...you deadlock it and any windows that are open will automatically close.
Perhaps the teeth on the regulator in the driver's door are knackered and it's that noise you hear when locking as the motor tries to close the glass.

[Puggy2]

What happens if you use the key in the passenger door to open/close the car

[parcelman]

when i lock the passenger door with the key it locks but makes that loud machine gun noise,it does sound like the teeth on the motor are grinding or jumping,ive used wd40 as advised but no joy

[Rolebama]

I would advise removing door card and having a proper look at mechanism. As said above the noise is central locking going on and off in the door, and usually indicates a mechanical fault.