Preliminary Checks
- Check harness connection at wiper motor and switch. Wiper motor and switch must be securely grounded. Check fuse. If connections and circuits check out, operate wiper in all modes. If system does not operate correctly, continue to step two.
- Disconnect wiper motor connections and operate wiper motor with jumper wires (see illustration). If motor operates correctly after by-passing switch and harness, test system with motor on car. If motor does not operate, continue to step three.
- Disconnect wiper linkage from motor crank arm and try jumper wire test again as in step two. If motor operates, check linkage for binds. If motor fails, remove motor and test motor circuits.
Courtesy of GENERAL MOTORS COMPANY