How can I fix my automatic seat belts? on 1994 Saturn SL

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about two weeks ago, I took my car for a car wash. When I turned the car on and shut the doors my seat belts engaged like normal. Then I pulled away and they disengaged, sliding back and forth. Now they are in the open position jolting back and forth not sliding. I had to unlatch the belts cause they wont close. Every now and then the passenger belt does slide back and forth. What does this mean? How can I fix this problem?
(1) Answer
I had the same problem in a 1993 sl1, there is a computer for the seatbelts under the parking brake lever which had been smashed and cracked and was filled with soda syrup since this is where i would set my drinks. found replacement at junkyard and now it works great.