A bit more on what shogun said. To follow along, get the ETM from http://wedophones.com/BMWManualsLead.htm and go to diagram 6160-0.
Wipers are actually controlled by the K10 wiper control unit located in the fuse box. The switch shogun mentions is an internal switch in the motor that tracks the position of the wipers. When the wipers are parked the switch is open (parked). As soon as the wipers start moving the switch closes (run). This cycles every full sweep of the wipers. When you turn on the wipers, the control unit receives ground on one of the on inputs which in turn flips a relay switch to send power to the wiper motor. Now when you turn off the wipers, you want to let them keep moving until it's back in park. That's the reason for the internal switch. It keeps supplying an 'on' input to the controller until the motor returns to park. Then the switch is opened, 'on' input ends, and the wipers are parked. Since your wipers stop immediately when you switch them off, that shows the control unit isn't getting the 'on' input from the motor. There are 2 reasons for that. Most likely is the motor's internal switch. That likely means motor replacement. The second possibility is a wiring fault. To diagnose, start the wipers and then turn them off with the wipers not parked. At the motor, check for ground at the black/red wire connection. If you have ground, the wiring is bad. If not, the motor is bad.
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1986 Delphin 528e - Roof rack equipped lumber hauler.
1989 Zinnoberrot 325iX Sedan - I miss this car. (Deceased)
1998 Avus Blau 328iC - Someone else's project now
2008 Platinum-Beige X3 3.0si - Current project
2012 Alpine White X3 xDrive35i - My new snowmobile.
2020 Estoril Blue 440i xDrive cabrio - This car is a blast to drive.
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