Component Test - Rear Window Wiper Motor

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Do not handle the rear window 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 rear window wiper motor inoperative. Rough handling of new rear window wiper motors may also damage the motor magnets.

NOTE: Rear window wiper motor component test is carried out to determine if wiper motor and module are functional and not in software safe mode. Refer to WIPERS AND WASHERS for software safe mode parameters.

NOTE: Battery voltage must remain within 10 to 15 VDC to carry out test and keep wiper motor from entering its software safe mode.

NOTE: When connecting the power and ground test leads to the rear wiper motor terminals, care must be taken to not short terminals between power and ground, as well as making sure the logic ground, pin 3, is always securely connected to prevent permanent rear window wiper motor module damage.

If the rear window wiper motor does not pass any of the following tests, install a new rear window wiper motor. Refer to REAR WINDOW WIPER .

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

Fig 1: Identifying Rear Window Wiper Motor Using Sabre Premium Battery

Courtesy of FORD MOTOR CO.

Disconnect the rear window 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 pins 1 an 2 (3). Connect battery positive cable (5) to wiper motor (4) component side connector battery and logic positive pins 3 and 4 (5).

On Mode

Test the on mode by connecting a separate set of test leads from battery ground (-) post to windshield wiper motor (4) component side pins 6 and 7 (6). When these pins are grounded, the rear window wiper motor operation should now be in on mode.

Washer Pump Relay (Integral)

Test the rear window wiper motor internal washer relay function by measuring the voltage between wiper motor (4) component side pin 5 (7), and ground. When wash command input pin 6 (7) is grounded, measured voltage should read 10 volts or greater.