Wipers do not work but motor does on my geo prizm

Does "dont work"mean they dont move, or fail to wipe clear water.
>???????????????????
so if the motor spins, do both drive shafts spin
left and right>? its just mech, drive, no magic here, or computers.
do both arms fail to move?

Either the splined knob where the main arm connects to the motor is stripped or the arm has become disconnected...Only a small nut holds the main arm to the motor..If it becomes loose just a fraction it will strip the splined knob where arm connects to motor...