Component Tests and General Diagnostics

COMPONENT TEST - WIPER MOTOR

CAUTION: Do not handle the windshield wiper motor roughly when diagnosing the wiper operation. Failure to follow this caution may cause damage to the motor magnets, which results in an inoperative 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. 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 voltage and ground test leads to the windshield wiper motor terminals, care must be taken not to short the terminals between voltage and ground. Make sure the logic ground, pin 3, is always securely connected to prevent permanent damage to the windshield wiper motor.

The following component test checks the motor out of the vehicle.







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

Disconnect the windshield wiper motor connector C125 from the windshield 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 is 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 is 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 of the tests, install a new windshield wiper motor. If the windshield wiper motor passes all the tests, measure the resistance of all circuits on the wiper motor harness and repair as necessary.