Hi, 

 

I had an issue with my passenger door lock and had it serviced and everything worked till a few days when my driver side started to do the same. But after service it seems like it isn't mechanical more electrical but once I lock the door it locked but just 2 seconds later unlocks back. I though faulty sensor but nothing has a problem only issue is for the driver side. Confused if I have to buy a new actulator or it's something else. Please do advice.

Not sure could it be the small micro switch within the lock who tells if doors are closed or not. Does the interior light stay off?