The third dash button mystery!!
Found pic online, symbol has a seat with a letter "R" on it.
Press it, light turns on, now your controls will control the passenger (R) seat, I don't have cooled seats but I have passenger seat memory and that's how it works.
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I had to find a UK 2015 GLE manual. It's an Auxiliary heater button, looks like they have a "Furnace" that runs off gas but is separate from the engine. I skimmed the manual so if someone wants to really read it and correct me, please do.











