Hello I will help you with your question,
Your condition is addressed in a Technical service bulletin,
File In Section: 08 - Body and Accessories
Bulletin No.: 02-08-43-002
Date: May, 2002
Subject:Windshield Wipers Park In Outwipe Position(Install Wiper Motor Crank Arm and Wiper Motor Bracket Service Kit)
Models:2002 Buick Century, Regal2002 Chevrolet Impala, Monte Carlo2002 Oldsmobile Intrigue2002 Pontiac Grand Prix
Some customers may comment that the windshield wipers park in the outwipe (vertical) position.
This condition may be caused by a bent park tab on the windshield wiper motor bracket.
To correct this condition, install a new windshield wiper motor crank arm and a windshield wiper motor bracket service kit. Use the following service procedure:
Remove the windshield wiper motor from the windshield wiper motor bracket. Refer to the Wiper Motor Replacement procedure in the Wipers/Washer Systems sub-section of the Service Manual (SI Document ID # XXXXX).
Test the operation of the windshield wipers and washer
To remove the wipers
If you need more detailed instruction let me know your level of ability