1999 C230 wiper arm not working
 

Have 1999 C230K and wiper comes moves to the other side of the car and stops then you hear the motor trying to bring it back. I got the cover off on the arm but i cant get the large cover off. i found someone the had some photos and they stated there were 2 tabs i cant fined any tabs.I am going to try to post photos.Thanks cant post photos.