Check circuit diagrams for other components sharing the same circuit, it could be that the wiper motor/washer pump is picking up an earth (ground) from one these, i.e. following the path of least resistance. A simple test to perform is, with the ignition off, pull the fuses for each component sharing the same circuit then, one fuse at a time, refit them and check wiper/washer operation each time, until you have located any possible culprit. Check the grounding points for those particular circuits. Check also that the contacts in the switch or relay aren't arcing out.
Hi I have the same problem. Rear wiper a washer jet will not turn off. intermittent works it should. Baffled.
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