Since you have delay wipers, the module or park mechanism has gone bad.
Check the connections to the wiper motor, make sure they haven't backed out.
If the connections are good, then consider that you may have to replace the wiper module, which is part of the wiper motor.
Some vehicles, the module can be replaced seperate, but the wiper motor will have to be pulled to replace it.
But, I did find this service bulletin, which I would try first..........
Wipers - Park At Incorrect Location
File In Section: 8 - Chassis/Body Electrical
Bulletin No.: 73-82-05A
Date: April, 1998
Windshield Wiper Arms/Blades Park at Incorrect Location
(Replace Wiper Motor Crank Arm Assembly, Install Deflector and Seal Crank Arm Cover)
1997-98 Buick Century, Regal
1998 Oldsmobile Intrigue
1997-98 Pontiac Grand Prix
This bulletin is being revised to add the 1998 model year, the Oldsmobile Intrigue, additional part numbers, revised repair procedures and labor times. Please discard
Corporate Bulletin Number 73-82-05 (Section 8 - Chassis/Body Electrical)
Some owners may comment that the windshield wiper arms or blades intermittently stop (park) in a vertical position, rather than at the base of the windshield, when the wiper switch is placed in the "OFF" position. They may comment that the condition usually occurs after a heavy rain or car wash followed by cold (below freezing) temperatures.
During heavy rains or car washing environments, water entering the cowl (plenum) through the leaf screen may accumulate and later freeze on the depressed park actuator arm which is located on the bottom side of the wiper motor crank arm. If this occurs, the actuator arm may not come in contact with the metal tab on the wiper motor mounting bracket when the wiper switch is turned off, resulting in the arms parking in a vertical position.
To correct this condition, replace the wiper motor crank arm with P/N 12367235 and install water deflector P/N 10411068. Also, additional sealing material must be added to the crank arm cover to improve the deflection and channeling of the water away from the crank arm assembly.
Use the following service procedure when replacing the crank arm assembly, installing the new water deflector/retainer and to improve the sealing of the crank arm cover.
Important : Some vehicles may have already had the wiper motor crank arm replaced. These vehicles can be identified by the barrier material already applied over the hole in the crank arm cover. If the crank arm cover already has the barrier material applied, then it is only necessary to install the new water deflector. Do not replace the crank arm assembly on those vehicles. If there isn't any barrier material already applied over the hole in the crank arm cover, then the crank arm assembly must be replaced and the new water deflector installed.
12367235 Wiper Motor Crank Arm Assembly
10411068 Deflector, Wiper Motor Water
(includes push-in retainer)
12345739 RTV Silicone Rubber Sealant
( 3.35 oz tube)
11515174 Barrier Material