The connector on the buzzer, like all the other control units in the car, simply pulls off. Yes that nut is the PITA one I'm talking about. Yes, the whole bracket will go right back where it was when you're done.

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.