Low beams not working
Check the light switch, fuse, relay and the wiring to the bulbs. Don't forget the ground wires either.
SOURCE: change head light
You should be able to reach under the hood into the headlight assembly and grab the bulbs and twist them off if not then you have to take off your entire headlight assembly then take the bulbs out.
SOURCE: I have a 2002 GMC Denali and my low head lamps
Start by checking the fuses.Check both fuse boxs.Under the hood behind the batterie and Dr side end of dash.There would be seperate ones, lowbeam/hight beam.You can always check the bulbs by swaping them with the high beams.Just be sure not to touch the bulbs.Use paper towl to hold them.
SOURCE: my 2007 Envoy low beam
two possibilities. your lights are bad or you have a bad hi/low switch. i would check the lights first.
SOURCE: My 2003 GMC Yukon XL Denali low beam headlights do
The problem is likely your multi purpose signal light switch. If you take the lever and move it from hi to low beam will the low beams come on? It is common for this multi purpose (real expensive ) switch to fail after a period of time! The steering wheel may have to be removed, to change it. The air bags will also need to be disabled so as not to active them while removing the switch.
SOURCE: I have a 2004 GMC
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Check the relay under the head. Most of the cars has LOW/HIGH beam relay. Replace them if necessary. You may try to test also the wires to see if there is a short in the wire. You can find this wire by using a test light turn on the key and get a good ground. With the test light, poke the wire and see if the test light illunimates with the headlight switch on.
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