Daytime running lights.

I have a '98 Explorer and my daytime running lights are not working , the headlights work properly though. I've checked the fuses and all of them are fine. Whats the next step I can take ?

Might have to ask the dealer.... My lights underneath my side view mirrors burnt out and I had to find out the bulb size from the dealer. Because these lights are in the runnning board you may have to have them replace them