No I haven't - but I'll listen closer now.
The seat bottoms and backs have small fans that blow heat and cool air through the perforations depending on the setting. The fans cycle on and off depending on the setting. They use a TED to create the heat or cool air in which the fans then blow through the perforations.That's the heated seats. I have no idea why it makes that sound. But it drove us mad trying to figure out what it was. It only come on when you turn on the heated seats