Component Tests and General Diagnostics

WINDSHIELD WIPER MOTOR

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 which results in an inoperative wiper motor. Rough handling of new windshield wiper motors can also damage the motor magnets.

NOTE:
- The windshield wiper motor component test determines if the windshield wiper motor and module are functional and not in software safe mode. Refer to Principles of Operation for software safe mode parameters.
- Battery voltage must remain within 10 to 15 volts to carry out test and keep 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 terminals between power and ground. Make sure the logic ground, pin 3, is always securely connected to prevent permanent damage to the windshield wiper motor module.

The following component test has 2 parts. Part 1 will test the wiper motor on the vehicle through the windshield wiper motor jumper harness. Part 2 will test the wiper motor out of the vehicle.

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







Part 1
Disconnect the wiper motor jumper harness C110. Connect the (1) green lead from the (2) SABRE to the battery ground (-) post. Connect the red lead (3) from the SABRE to the windshield wiper motor jumper harness C110 (4) component side connector, ground and logic ground pins 10 and 12 (3). Connect battery positive cable (5) to windshield wiper motor jumper harness C110 (4) component side connector battery and logic positive pins 1 and 9 (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 jumper harness C110 (4) component side, pins 2 and 6 (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 the windshield wiper motor jumper harness C110 (4) component side, pins 2, 5, and 6 (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 jumper harness C110 (4) component side, pin 4 (8) and ground while grounding the windshield wiper motor jumper harness C110 (4) component side, pin 3 (9). When the wash command input pin 3 is grounded, measured voltage should read 10 volts or greater.

If the windshield wiper motor does not pass all of the tests in Part 1, remove the wiper motor jumper harness. Refer to Windshield Wiper, then carry out Part 2 of this component test.







Part 2
Disconnect the wiper motor jumper harness from the wiper motor. Connect the (1) green lead from the (2) SABRE to the battery ground (-) 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 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 the 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.

If the windshield wiper motor does not pass all the tests in Part 2, install a new windshield wiper motor. Refer to Windshield Wiper. If the windshield wiper motor passes all the tests in Part 2, measure the resistance of all circuits on the wiper motor jumper harness and repair as necessary.