Wiper Motor: Testing and Inspection

CAUTION: Do not handle the windshield wiper motor abusively when diagnosing the wiper operations. Failure to follow this caution may result in damage to the motor magnets and will make the windshield wiper motor inoperative. Rough handling of new replacement windshield wiper motors may also damage the motor magnets.







Use the Alternator, Regulator, Battery and Starter Tester to test the wiper motor on the vehicle.

To test the wiper motor, disconnect the windshield wiper mounting arm and pivot shaft from the windshield wiper motor. Refer to Wiper Motor Linkage.

Disconnect the wiper motor. Connect the (1) green lead from the (2) ARBST to the battery negative (-) post. Connect the (3) red lead from the ARBST to the wiper motor (4) common brush terminal (Terminal 3).

Test the low speed mode by connecting a (5) cable from the battery positive (+) post to the (6) low speed brush terminal (Terminal 4) and measure the current draw. If the current draw is greater than 3.5 amperes, install a new windshield wiper motor. Refer to Wiper Motor.

Test the high speed mode by connecting a cable from the battery positive (+) post to the (7) high speed brush terminal (Terminal 5) and measure the current draw. If the current draw is greater than 5.5 amperes, install a new windshield wiper motor. Refer to Wiper Motor.