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Wiper delay question, for the hardcore electrical wizards

Is your wiper system like mine?

I have a slide switch on the arm behind the steering wheel. It has Off/Delay/Low/High. And I have a knob to turn next to the radio, 5 different delays and off.

What I would expect was that the delay would only work when the slide is in Delay but here’s how it works today:
Low and High work fine, so I assume the wiring at the motor is OK. In Off on the slide, I can turn the knob and then I get delayed wipe. But in Delay on the slide, I get delay again, but it doesn’t park. It’s actually quite amusing to look at, the wiper blade moves 1/3 of the way and then another 1/3 when the next pulse comes, and it goes on like that, like a Jacques Tati movie.

Is it like this in your Longchamp/Deauville?

So why does Delay work when the slide is in Off? And why does the Delay not park when the slide is in Delay? Are some wires switched?

Any views on this tricky one?
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