1. Open the rear door and remove the lower door trim.
2. Disconnect the 4-pin connector from the rear window wiper motor.
3. Apply voltage from the battery to pins #1 (+) and #3 (-) and check if the e/motor rotates smoothly without abnormal sounds.
If an abnormal sound is heard or the e/motor does not rotate smoothly, replace the e/motor.
4. Rotate the e/motor under the conditions of point 3 and check if there is a voltage of approx. 0-4V between pins #4 (+) and #2 (-).
The measurement is carried out by an analog tester (measuring range 0-15V).