Why my low bem lights (running lights) will not come on. on 2005 GMC Envoy

I have changed the bulb on both sides and fuse. The high beams work, parking, fog and brake lights work.

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2 answers
the relay is bad
Could be a dimmer switch or relay. Probably would need to be diagnosed by a shop with automotive electrical experience who could review the electrical diagram and map out powers and grounds.