Wipers Inoperative In All Modes

Turn ignition on. Using test light, check for battery voltage between White wire at wiper switch and ground. If voltage exists, proceed to next step. If voltage did not exist, check for defective fuse or open in White wire between fuse block and wiper switch.
If voltage exists, remove electrical connector from wiper motor. Using test light, check for battery voltage between White wire of wiper motor connector and ground.
If voltage exists, proceed to next step. If voltage did not exist, check for defective connection at wiper motor or open in White wire between fuse block and wiper motor connector.
If voltage exists, place wiper switch in LO position. Using voltmeter, measure voltage between Gray wire of wiper motor connector and ground.
If battery voltage exists, proceed to next step. If battery voltage did not exist, check for open in Gray wire between wiper switch and wiper motor. If wiring circuit is okay, replace wiper switch.
If battery voltage exists, place wiper switch in high speed. Using voltmeter, measure voltage between Purple wire of wiper motor connector and ground. If battery voltage exists, proceed to next step. If battery voltage did not exist, check for open in Purple wire between wiper switch and wiper motor. If wiring circuit is okay, replace wiper switch.
If battery voltage exists, measure voltage between Purple wire and Black wire of wiper motor connector. If voltage exists, proceed to next step. If battery voltage did not exist, check for open in Black wire from wiper motor connector to ground.
If battery voltage exists, check for defective connections at wiper motor. If connections are okay, replace wiper motor.