The headlight washer comes on simultaneously to the windscreen washer. Use the screen washer and the headlight washer would also go regardless of the requirement. In the E60 it was angled upwards so the headlight washer would effectively spray the entire bonnet in a moving car. In the F07 (and possibly others) it is angled across the headlight and over the fender. Every time I have seen it deployed, it was not enough to spray pedestrians and passing cars.
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