Hello:

I have a 97 XK8.  The windshield wipers are very erratic.
The majority of the time they won't turn of after placing selector in off
position.
They turn off, seemingly, when they are ready to turn off.  Sometimes,
staying on after I have turned the car off.
Also, sometimes they stop in the middle or top of windshield.

Can somebody help me with this problem?
Is the problem most likely the wiper motor, or the control module?

Thank you very much.