On this website (link below) you find fuse box diagram and description for Chevrolet Avalanche mk1 (2001 - 2006)
Chevrolet Avalanche GMT 800 2001 2006 fuse box diagram Auto Genius
Fuse box contact under fuse panel two orange wires bad contact here wiggle wires around light may come on
SOURCE: My low beams work on my headlights but my High beams wont come on
Take a look at this link regarding DRL system. I know it's not exact truck but most of it would apply to yours too. It should give you hints on what to test & how.
http://www.fordf150.net/howto/drl.php
SOURCE: 2002 chevy trailblazer low beam lights will not come on.
if both lamps dont work a common problem was the headlamp module. It looks like a black relay in the underhood fuse block (next to the master cylinder), there is two black small relays right next to each other (they used to say 15016745 on top in white letters.) One is for the low beams and one is for the fan clutch. Swap them and check the lamps - if the come on, go get a new one at the dealer and replace the bad one. If you leave the bad one in the fan clutch your gas mileage will be bad and your ses light will come on.
SOURCE: 2002 Acura RSX low beam headlights dont work. All
I have the same issue on a 2003, plus the running lights don't work. Checked all fuses, changed dimmer switch. Still have the problem... :-(
SOURCE: Audi A4 2002 Low beams & Right front turn signal stopped working
but on 2002 A4, F20 and F21 are empty! Does anyone has an idea where the headlight fuses located?
SOURCE: 2002 Acura TL low beam headlight
How to Shift my headlight beam from position.
from I replace my headlight it's spatting directly on the ground..What can i do to change it from position
http://repairhelpcenter.blogspot.com/2012/01/passenger-side-low-beam-out.html
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Low beam HID light goes out?
http://schematicsdiagram.blogspot.com/2012/01/low-beam-hid-light-goes-out.html
----------2007 Dodge Caliber: Low Beam Headlight Not working
http://technoanswers.blogspot.in/2012/06/2007-dodge-caliber-low-beam-headlight.html
-------------Chevy Tahoe: Low Beam Lamps are not working?
http://technoanswers.blogspot.in/2012/04/chevy-tahoe-low-beam-lamps-are-not.html
----------2001 Chevrolet Tahoe: Both Low Beam Lamps Not Working?
http://technoanswers.blogspot.in/2012/04/2001-chevrolet-tahoe-both-low-beam.html
--------------2002 Toyota Tacoma: Low Beams not working?
http://technoanswers.blogspot.in/2012/04/2002-toyota-tacoma-low-beams-not.html
-----------Low beam headlights Modification?
http://schematicsdiagram.blogspot.in/2012/04/low-beam-headlights-modification.html
-----------DRL and Low beams not working?
http://schematicsdiagram.blogspot.in/2012/04/drl-and-low-beams-not-working.html
-----------These will help.Thanks.
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