Wiper Motor - Rear Window

CAUTION: The magnets in the windshield washer motor can become damaged if the motor is jarred.

CAUTION: The ammeter must have a range of at least 10 amps DC to prevent damage to the ammeter.

NOTE: Use an external 12 volt DC supply which can be loaded to at least 10 amps, or use fused battery voltage.

Measure the voltage drained by the rear window wiper motor.

Fig 1: Measuring Voltage Drained By Rear Window Wiper Motor

Courtesy of FORD MOTOR CO.

Turn off the ignition.
Remove the component electrical connector.
Connect the negative terminal of the ammeter to pin 2 of the rear window wiper motor. Connect the voltage supply negative to the rear window wiper motor housing.
Connect the voltage supply positive to the positive terminal of the ammeter and switch on the voltage supply. Read the current on the meter as the rear window wiper motor runs. The reading should be about 2 amps.
Turn off the voltage supply and remove all test connections.
Check the limit switch.

Fig 2: Checking Limit Switch
Courtesy of FORD MOTOR CO.

NOTE: The rear window wiper motor must not be at the rest position.

Connect the voltage supply negative to the rear window wiper motor housing. Connect the voltage supply positive to pin 1 of the rear window wiper motor and switch on the voltage supply. The motor must run and stop in the rest position. If it does, the motor is OK. If not, install a new rear window wiper motor. Refer to WIPER MOTOR - REAR WINDOW in this article.