The windshield wipers may not work intermittently due to a faulty wiper motor control board. Our technicians tell us that lightly taping on the wiper motor when the fault occurs should temporarily get the wipers working again. Some vehicles were recalled for this problem and some were not. You will need to check with your local dealer to find out if a specific vehicle was included.Google+
Car Problem Reports
Chevrolet Suburban 1500 Windshield Wipers May Fail Due to Faulty Wiper Motor Control Board
Chevrolet Suburban 1500 Problem
Average Mileage: 121,000 mi (35,000 mi - 188,000 mi)
Visitor, 1992 Chevrolet Suburban 1500, 140,000 mi
I have the same problem. They work at times and then just stop working but I can hear the wiper motor running.
Visitor, 1998 Chevrolet Suburban 1500
mine our doing the same but i have found the problem seems to be a bad wiring connection at the motor plug.
Visitor, 1993 Chevrolet Suburban 1500, 188,000 mi
I have two 1993 GMC suburbans. Both have this problem. When turned, wipers randomly do not operate, or will stop when operating, even though it sounds like the wiper motor is operating. If you slap the wiper motor, the wipers immediately start. Its random and I haven't been able to duplicate it for my mechanic