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I have a 95 grand marquis and i had the same problem. I fixed mine myself by replacing the wiper motor. The problem was the motor will still work on high but not low. Its an enternal issue on the motor that wont allow it to fully rotate when shut off and its not accepting the low voltage to run on low. My answer is 100% accurate
Take it to dealer unless you can replace the wiper switch assembly yourself, a sure test is using a circuit tester. also tighten the motor housing if the nuts are loose usually GM uses 3 nuts, other wise take it to the dealer, they have the Technical Service Bulletins on your car, the non-dealers may not have them or have no clue or plain give you a false statement that they give you like a you don't have a clue, if so time to walk out and not return.
well the good thing is you know the wipers work !! , I would start by seeing if the washer squirters work when using the Wiper lever . and I would also see if it worked on fast speed and slow speeds . If it does you may have a wiper switch that has gone bad ! ,