What are the common problems with bmw e30 central locking?

My BMW E30 central locking has stopped working. I have checked the fuse and it is ok. What can i do next?What are the common problems with bmw e30 central locking?Check the microswitch for the drivers door lock. These can sometimes fail.What are the common problems with bmw e30 central locking?check the courtesy light switches in the door pillars if they break the locking system thinks a door is still open and will not lock