I have a 1999 sl2 saturn and i need to know why the motor on the windshield wipers dont stop and go the other way so on and so forth

first you will need to pop out the dash top because there is 2 nuts by the bottom of the glass on the fire wall where the wiper motor is under the cowl then open the hood and remove the wiper arms and the cowl then you will have 2 or 3 bolts that hold the wiper transmisson in place and out comes the wiper moter

the computer board on the wiper motor is gone bad

Most certain that the fuse has blown out on the wiper section. So look on your fuse box for the Wiper fuse and replace with the spare available.
Now if the fuse blows out again there is short in the wiper motor , or it has jammed.
If the fuse is intact then the motor can be faulty or a possible break in the wiring.

it could be the wiper relay or the wiper motor could be heating up and stoping causing it to work again when it cools down either case start with relay and if that does not fix the problem replase the wiper motor

Same problem here. Check for a short in the wiring under the dash before replacing anything. I replaced the integral switch and the motor/module assembly and yet......they keep going and going and going. After shelling out 250.00 I wished I would of investigated a little more. My problem is the black wire from the ignition switch to the splice pack/ ground terminal is burnt. and also charred about 6 other wires. 3 of which pertain to the wiper switch assembly. I don't know if this helps, but hopefully it will.

You can get the replacement wiper at almost any parts store, but if there is an Auto Zone around your area. They would have the part you need and the step by step instructions for you to get the job done with common tools and if there not busy, I am sure they would be more then happy to help you replace the wiper blades. Good luck and hope this helps. 

You need to replace the crank arm on the motor and either replace the bracket under it or bend the tab back up on the bracket so the crank arm can contact it so the wipers stop in the right place.

the motor is shorted internally. need to replace the wiper motor.

wiper relay is in the engine compartment Check there. Please rate my response thank you very much

its an old car..............................