daytime running lights stopped working

[ctfl]

2015 expedition king ranch daytime running lights stopped working. Is there a fuse or relay that controls them? There's no mention in the owners manual. There's no on/off setting from the steering wheel menu nor the sync menu's. Low beams, High beams, fog lights are all working from the selector knob. Does the 2015 expedition utilize the older resister type system for the daytime running lights? If so where is the resistor located? Thanks for your thoughts/input.