Do you want DRL or extended range? Can't have both.Thank you, thank you, thank you. I have been banging my head on the wall trying to figure out what happened to the DRL on my new 2018 MS. Turn off Range Extender and they suddenly work. Personally, I prefer the button in settings to turn them on or off. Fine if they want to turn them off when Range Extender is on, tell us about it. Leave the button there and just dimmed as not available. Perhaps changed the DRL button to say "Range Extender" if it's on so we have a clue. In any case, very happy I figured it out reading this post!