Posted April 12, 2022. There is only one pump for the front and rear screen. It is controlled by the Body Control Module (BCM). You need to get to the wires on the actual pump which is located on the side of the screen wash tank. Then use a meter to check if any voltage is getting to the pump when you operate the screen wash. The web page explains the common causes of windscreen washer system malfunction on Ford Fiesta, such as clogged nozzles, blown fuse, pump failure, leaking hose or blocked hose. It also provides simple steps to diagnose and replace the nozzles, pump or hoses if needed. The web page does not mention screen wash not working as a specific problem. yCgRD.