Wipers Run At Low Speed Only Test: Corvette
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 1991 Pontiac Grand Prix, 1991 Pontiac Grand Am, 1991 Pontiac Firebird, 1991 Pontiac Bonneville, and 1991 Pontiac 6000. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect wiper motor module connector C3. Turn ignition switch to RUN or ACCESSORY position. Move wiper/washer switch to HI position. Connect a test light between C3 terminal "A" and ground. If test light is on, repair or replace wiper motor module. If test light is off, check for open circuit No. 92 (Purple wire). If circuit is okay, replace wiper/washer switch.