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Re: How to replace the headlights on my 2003 GMC envoy.
No the battery does not have to come out the grill in front must be removed .yhis grill runs through the headlight lens there ore 2 sqaure clips that hold the lens pull up on them slid out lens and get to the bulb should be 9007 bulb number.
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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!
open the hood.
there are 2 small steel "tabs" which you need to pull straight up.
once these are in the up position, pull headlight assembly forward.
remove plug connector to headlight, prying the wiring tab with a screwdriver.
rubber cover can be pulled off exposing the back of the headlamp bulb.