Same issue on a 2011 Panamera Turbo... no horn at all.
Can’t seem to find much documentation on this issue - nothing on the horn relay, or the correct part or location - despite checking those located under the hood and battery locations; nothing under my passenger seat. all the fuses are good.
Have to remove bumper and verify that the horns are dead, but what are the chances both died at the same time. The wiring harness appears to be good based on the other features functioning properly (e.g., ACC, Parking sensors).
any further suggestions, links or images would