I would say almost definatly, that the problem lies in the wiper motor itself, and there may be another problem with the "transmission" in the wiper motor.
Before jumping to any conclusions however, i would test the connections at the switch, if those connections are operating properly, check those at the motor with a wiring diagragm.
If those check out, i would imagine that there is an internal electrical problem with the motor and it needs replacement.
Good luck
Ben
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