The pump is under the trunk mat and covered in a form block. Check if there is any signs of water in the pump well and around the foam by sliding a piece of paper down the sides of the foam.
Getting to the pump is a major operation and not worth the effort if not required. The pump is responsible for more than just opening and closing the door locks. It times out the lights inside the cabin and the outside lights when the ignition is turned off when the lights have been on.