Low beams wont turn on 2004 gmc envoy replaced the bulbs and fuses and relays what else could it be

SOURCE: Both low beam headlights on my 05 GMC envoy do not

Check your headlamp relays under the hood, should be located on either the L/H or R/H fender well , could be inside a black plastic box labled fuses and relays... there will be a label on the underside of the lid to this box locate the relays as per lables... please rate my help thanks...

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 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

SOURCE: the auto headlights on my

Relay #46 in the underhood fuse panel is probably bad. You can verify this by swapping it with relay #45. Also, sometimes the relay contacts become corroded, check these when you have the relay out.

Ryan Lutton

• 1267 Answers
• Posted on Feb 21, 2011

SOURCE: 2003 envoy low beams will not work.fuses

For the I6 engine there is a relay for low beams, it's relay # 46. Switch it with relay #45 (runs the fan, same model relay) and see if your lights now come on. These 2 relays are the only 2 black ones in there (part # 15016745). Also, try to clean the contacts very well on the fuse box and the relay. If not, you may have some frayed wiring in the harness.

By the way, the high beam relay is #43, the gray one next to the windshield wiper relay #42.