Daytime Running Lights on 2000 Chevrolet Tahoe

My daytime running lights on my 2000 chevy tahoe just quit working one day. All my other lights work, I've changed the bulbs, I've checked all the fuses and I've even done the dome override button with the key on, just incase it was the cause. Where do I go now to look for the cause, and how can I fix it myself?

Asked by for the 2000 Chevrolet Tahoe