Here I am! The manual is in italian, but pictures are... international!
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SCBS sensor position
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In the grill there are also two frontal parking sensors, frontal lateral ones are in the bumper.
I'm sorry if I'm a little bit OT.
Don't know about weekends but a phone call to them should answer that question. Was your wife driving when the crack first appeared? Does she remember hearing anything that might have hit the windshield?