If it's the same as a Trailblazer you have to first remove the "bowtie" from the front between the two light bezels. Gentle pull forward and the pressure clips will release. Don't be shy. There are no screws. Than with the light bezels exposed you will see a metal clip that has to be pulled back to release the bezel and it will swing forward to allow you access to the bulb.
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I had an '04 GMC Sierrra and ran into the same problem. On it, there is a relay box under the hood on the driver's side. Pop the top off that big box and there are a bunch of relays in it. There is a diagram on the underside of the lid. One of them is for low beam headlights ( a different one for highbeams, horn, air conditioner, trailer lights,etc.). Most of them are the same model. I interchanged mine with the foglamp relay to check it. You might get familiar with them . I hit around 180K and the low beam relay went out...then I ended up changing 6 different ones in the next four months. They run about $12 each at O'Reillys or Advance.
Hope that helps
I have a 2004 GMC envoy with a V8 and its not to hard the drivers side plugs are not to bad to get to but the passanger side is a little tricky you have to go through the wheele well to get at them also the spark plug boot are really on there tight and were hard to remove them