Fuses and relays and bulbs look good. High beam works parking lights work and fog lights work
My guess is the turn signal/multifunction switch. All your light go thru here. except the third brake light. Here's is some electrical schematics, hope this helps 
SOURCE: 2004 chevy trailblazer low beams not working fuses good bulbs new
Check the relay or your head light switch has gone bad.
SOURCE: Low Beams Don't Work!
There is more than one relay I know but make sure your bulbs are good I HAVE seen this happen more than once.. low beams can go at once.. and still have hi beams check this first please .. Jerry
SOURCE: low beam headlight /daytime light are not working
It's on the driver's side. Remove all the plastic & it's in there.Big rectangle, black box,about 1.5" thick,lotta wires.
SOURCE: i have a 2001 chevrolet cavalier and the high beam
Sounds like its a problem with the light switch handle. Had it myself as well...
If you're savvy enough around car electronics take out the light switch handle, take it apart, find the problem and fix it. Inside the handle-switch you have several slide-switches and some double action slide switches.
Otherwise - get a different switch from a local junkyard or get a new one from your dealer.
Good luck.
SOURCE: High Beams, parking lights work. Have NO low beam
had same problem had to replce whole turn signal switch
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