Wiper Motor: Testing and Inspection

COMPONENT TEST - WINDSHIELD WIPER MOTOR

CAUTION: Do not handle the windshield wiper motor roughly when diagnosing the wiper operations. Failure to follow these instructions may result in damage to the motor magnets and may render the windshield wiper motor inoperative. Rough handling of new windshield wiper motors may also damage the motor magnets.

NOTE:
- The windshield wiper motor component test is carried out to determine if the windshield wiper motor and module are functional and not in a software safe mode. Refer to Principles of Operation for software safe mode parameters. Principles of Operation
- Battery voltage must remain within 10 to 15 volts to carry out the test and keep the windshield wiper motor from entering its software safe mode.
- When connecting the power and ground test leads to the windshield wiper motor terminals, care must be taken to not short the terminals between power and ground, as well as making sure the logic ground, pin 3, is always securely connected to prevent permanent windshield wiper motor module damage.

If the windshield wiper motor does not pass any of the following tests, install a new windshield wiper motor.







Use the SABRE Premium Battery and Electrical System Tester to test the windshield wiper motor.

To test the windshield wiper motor, remove the windshield wiper mounting arm and pivot shaft from the windshield wiper motor.

Disconnect the wiper motor. Connect the (1) green lead from the (2) SABRE to the battery negative (-) post. Connect the red lead (3) from the SABRE to the wiper motor (4) component side connector ground and logic ground pins 6 and 3 (3). Connect the battery positive cable (5) to the windshield wiper motor (4) component side connector battery and logic positive pins 5 and 8 (5).

Low Speed
Test the low speed mode by connecting a separate set of test leads from the battery ground (-) post to the windshield wiper motor (4) component side pins 9 and 10 (6). When these pins are grounded, the windshield wiper motor operation should now be in low speed mode.

High Speed
Test the high speed mode by connecting a separate set of test leads from the battery ground (-) post to windshield wiper motor (4) component side pins 1, 9, and 10 (7). When these pins are grounded, the windshield wiper motor operation should now be in high speed mode.

Washer Pump Relay (Integral)
Test the windshield wiper motor internal washer relay function by measuring the voltage between the windshield wiper motor (4) component side pin 7 (8), and ground while grounding the windshield wiper motor (4) component side pin 12 (9). When wash command input pin 12 is grounded, measured voltage should read 10 volts or greater.