Possible Causes

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

Open in circuits 28 (BK/PK), 941 (BK/WH) or 1205 (BK).
Inoperative wiper switch.
Inoperative washer pump motor.
Inoperative windshield wiper motor.
Inoperative rear window wiper motor (Freestyle only).