Wipers Do Not Operate In Any Mode
- Disconnect wiper switch connector. Connect test light between chassis ground and Yellow wire terminal of wiper switch connector. Turn ignition switch to RUN position. If test light is off, replace fuse and/or repair open wire.
- If test light is on, reconnect wiper switch connector. Disconnect all 3 connectors from wiper motor. Connect test light between chassis ground and Gray wire terminal of connector C2. See Fig 1
. If test light is on, go to next step. If test light is off, check for open Gray wire. If Gray wire is okay, replace wiper switch.
- Connect test light between chassis ground and Light Blue wire terminal of connector C2. Turn wiper switch to LO position. If test light is on, go to next step. If test light is off, check for open Light Blue wire. If Light Blue wire is okay, replace wiper switch.
- Reconnect wiper motor connectors C1 and C2. Leave connector C3 disconnected. Leave wiper switch in LO position. Connect test light between chassis ground and Yellow wire terminal of connector C3. If test light is on, go to next step. If test light is off, check for open Yellow wire. If Yellow wire is okay, replace wiper motor.
- Connect test light between chassis ground and Purple wire terminal of connector C3. Turn wiper switch to HI position. If test light is on, go to next step. If test light is off, check for open Purple wire. If Purple wire is okay, replace wiper switch.
- Check for open or short to battery voltage in Black wire between connector C1 and ground. If Black wire is okay, replace wiper motor.
Courtesy of GENERAL MOTORS CORP.