Not sure but in my past as a Buick mechanic, and that has been a long time, the w/s motor assy. also housed the "parking" controller. It sounds like it is just out of adjustment. If I remember correctly, you should take the wiper arms off of their mounts and turn the wipers on. Then turn them off and re-install the arms to the mounts at the correct position. That should more or less re-configure the controller. Hope this is all correct. It's been a long time.
R
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Ray and Barb Scrafield Huntington Beach, Ca.
2004 Monaco LaPalma 37 PCD
2019 Equinox/Blue Ox Tow Plate/ReadyBrake Elite tow bar/brake system.
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