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I taking another small guess. European smart cars, are Equipped with dual horns. The wiring is there for that extra horn. High, and low. Some members in the past, have added the 2nd horn. The way to test it, connect a test lamp to that connector, honk the horn. See if the test lamp lights up.

It’s probably for the driving lights. You can’t test for that, without a dash board switch.
 
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