2002 Ford Windstar windshield wipers

Check the fuses. Check the pump is getting power and is working and the pipes are not clogged

Principles of Operation
The front wipers and washer are controlled by the front electronic module (FEM). The front washer/wiper portion of the multifunction switch is hardwired to the FEM. When the switch is moved to the desired position, the FEM processes this information and outputs the appropriate command(s) to one of several hardwired relays which control the front wiper motor speeds or front washer pump actuation. Fault management of the front wiper provides limited front wiper functionality in the event of a failure of the front wiper/washer switch or an ignition switch failure transmitted by the instrument cluster module.
The front washer pump is hardwired to the FEM which will actuate the pump when the front wiper/washer portion of the multifunction switch is moved to the wash position.
The rear wiper and washer are controlled by the FEM. The rear wiper/washer portion of the multifunction switch is hardwired to the FEM. When the switch is moved to the desired position, the FEM processes this information and outputs the appropriate command(s) to a hardwired relay which controls the rear wiper motor speeds, and rear washer pump actuation.
Inspection and Verification
Verify the customer concern by operating the wiper and washer.
Visually inspect for obvious signs of mechanical and electrical damage.