2013 Chevy Silverado lights question

probably the relay, might sound stupid but did happen to make sure the bulbs weren't burned out. The day time running lights will make them fail faster. did you check the voltage at the harness with the light out to see if you were getting the correct voltage which I think is 12v

I haven't. He took it to the dealer and they ran a quick test. They told him that they think it's likely both bulbs are out.