WARNING: This page is about a different car, the 2016 Porsche Macan and 2015 Porsche Macan. However, it is still accessible from the selected car via links, so may be relevant.
Tighten fastening screws -2-
on antenna for auxiliary heater -1-
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Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Connect plug connections until they engage securely.