04 Envoy low Beams not working

Low beams do not work at all the High Beams are fine I have replaced the lamps and still not working, what fuses are needed to be cheacked and if not the fuses any other things I should be looking for.
Thanks.

Look at the fuses in the center under the rear seat, if ok check for 12v at the low beam wire at the connectors on the h'lites.

If both low beams are out, suspect the solid state relay up front that also feeds the low beams their DRL power. It's not a normal relay, but you can swap with the adjacent one that also runs the fan clutch as an experiment. Headlights are also all fused individually under the hood, but the solid state relay can take them both out at once.

Swap #45 and #46 for the experiment.

http://www.roadie.org/frontfuses.jpg

Roadie is right about this. I had similar problem with 03 Envoy XL. The relay is $ 45. I wish I checked this forum first. I bought a headlights switch for $ 147 but it was not it.