Replace low beam bulb but still not working
Check to make sure the fuse is not blown. The fuse for the low beam and high beam headlights are in the fuse block under the hood. Each light has its own fuse.
SOURCE: 2008 gmc acadia low beam light bulb changing
how do you change the low beam light bulb on the 2008 gmc acadia
SOURCE: brake lights on GMC truck do not work replaced fuses & bulbs
ther is a switch called a brake lifgt switch that has a pin that is moved by your boot brake pedal arm.
the way it works is: when you press on the brake the brake pedal moves down and the spring in the switch pushes out closing the contacts to your brake lights the switch is located high up under the driver's side of the underside of the dash near or, on the brake pedal support replace or, adjust this switch
SOURCE: no lowbeam headlights
Headlight Switch itself If Not then this Very Well May be in your Multifunction Switch
SOURCE: GMC truck light issue: My high beam / low beam
well as a tech i dont recomend it but all you got to do is swap the wires on the headlamps at the bulb you will see 3 wires one is a ground the other feeds low beam the other high beam . take a test light and find the one thats hot and cut it and connect it to the other blade , leave only one wire on the low beam terminal so you dont short it out .
Testimonial: "Great info many thx"
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
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