Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
There are some tests that can be done to pinpoint the problem. Let me give you the diagram as well.
Windshield Wiper/Washer (With Cruise Control)
Windshield Wiper/Washer (Without Cruise Control)
Check continuity following Fig. 13 , then apply battery voltage to motor and first grounding terminal A, then terminal C. Motor should operate at Hi and Lo speeds respectively. If not, repair or replace motor as necessary.
Refer to Fig. 14 for wiper switch diagnosis.