Vent window motors, function - GF67.39-P-2100-02GH

Model 163 with code 848 

The vent windows can be opened and closed by the associated left rear vent window motor (M21/8) and right rear vent window motor (M21/9) controlled by the left vent window switch (S21/13) and right vent window switch (S21/14) 

Circuit 30 is switched by the convenience relay (F1 k14) and the corresponding switch is switched directly to the motor for control of the motors.