Just above the headlight assembly are two angled tabs, pull these straight up (they may need some effort). These will release the assembly, carefully pull the entire assembly forward. Access to the headlight bulb is behind the two rubber caps, the upper cap is for the low beam. Remove this cap, twist the headlight bulb socket CCW and remove. Disconnect bulb from harness by prying up gently on locking tab on socket, and pull bulb out. Being careful not to touch the new bulb glass surface with your finger, plug it into the socket and install it back into the headlight assembly turning it CW. Reinstall rubber cap, seat headlight assembly on frame, lining up the bottom and top pegs. Once the assembly is fully seated, push the two angled tabs down, locking the assembly in place.
Just above the headlight assembly are two angled tabs, pull these
straight up (they may need some effort). These will release the
assembly, carefully pull the entire assembly forward. Access to the
headlight bulb is behind the two rubber caps, the upper cap is for the
low beam. Remove this cap, twist the headlight bulb socket CCW and
remove. Disconnect bulb from harness by prying up gently on locking tab
on socket, and pull bulb out. Being careful not to touch the new bulb
glass surface with your finger, plug it into the socket and install it
back into the headlight assembly turning it CW. Reinstall rubber cap,
seat headlight assembly on frame, lining up the bottom and top pegs.
Once the assembly is fully seated, push the two angled tabs down,
locking the assembly in place.
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SOURCE: 2006 GMC Envoy low beam
Hello, try to start by checking the headlight relay and headlight fuse. You
also may want to check to make sure the bulbs aren't blown out. If those
parts check out to be fine and in working order, you may need to
replace the turn signal assembly in the steering column. This part
controls the hi/low beams. This may sound crazy but, when GM wired
their older trucks, they wired the headlights to go from the battery,
to the hi/low beam switch, then to the headlight switch (to the left of
the steering wheel) then out to the light bulbs. You can kind of test
to see if this part is good by making a fist and (with your headlights
on) gently hitting the plastic cover for your steering column that is
right behind your actual steering wheel. This could cause your
headlights to flicker on and off.
Thanks
SOURCE: 2003 GMC Envoy Low beam headlights will not work.
I would start by checking the headlight relay and headlight fuse. You also may wanna check to make sure the bulbs aren't blown out. If those parts check out to be fine and in working order, you may need to replace the turn signal assembly in the steering column. This part controls the hi/low beams. This may sound crazy but, when GM wired their older trucks, they wired the headlights to go from the battery, to the hi/low beam switch, then to the headlight switch (to the left of the steering wheel) then out to the light bulbs. You can kind of test to see if this part is good by making a fist and (with your headlights on) gently hitting the plastic cover for your steering column that is right behind your actual steering wheel. This could cause your headlights to flicker on and off. It's not 100% guarenteed that this method will work, but it may.
Any questions, just ask!
SOURCE: Changing a headlight on a 2004 GMC Envoy
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.
SOURCE: 2003 gmc Envoy Low Beam Headlights both quit at
Relay in fuse box under hood on driver side wheel well labeled HDM, #46 on 2004 Envoy XUV. Swap with relay #45 labeled "Fan" to test. That was my problem.
Good Luck,
Sam
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