2003 Trailblazer Headlights
 

2003 Trailblazer has an intermitent problem where both running lights (low beam headlights) will go out while driving. I immediately checked both fuses (both tested good) and changed both just to be certain. One time the running lights started working after changing the fuses (a coincidence?). Now lights are out again and the fuses are good. How do I troubleshoot this problem?

RE: 2003 Trailblazer Headlights
 

Check all your connections for the lights and make sure they are tight and corrosion free.

RE: 2003 Trailblazer Headlights
 

check and or replace the ignition lock cylinder/switch assembly. there has been a few
problems with them

RE: 2003 Trailblazer Headlights
 

I checked light connections; everything is tight and no corrosion is present. Problem of both low beam headlights going out simultaneously continues. Lights will go back on after Headlamp Driver Module relay (46) has been removed and re-installed.

RE: 2003 Trailblazer Headlights
 

Glensy, I did this on my 06 TB....I switched the HDM relay with the fan relay beside it. The lights came back on!! I went to the dealership and bought a new relay and so far , it seems to have cured it.
I had to ressurect this post to say thanks!!!

RE: 2003 Trailblazer Headlights
 

Guys, thanks for the fix! I also replaced the relay on my '06 TB and the lights came right back on.

RE: 2003 Trailblazer Headlights
 

im having the same problem with my 03 tb. the high beam lights will work when i manually switch them over. some say it might be the light switch is gone. now as of 6/22/08 the low beams nor the day light lamps will work,only the high beams. can anyone help me?

RE: 2003 Trailblazer Headlights
 

yeah, for those whose lights go out suddenly and wont come back on. you can temporarily swap the fan relay with the headlight relay to get you out of a bind...

RE: 2003 Trailblazer Headlights
 

a couple of nights ago I had an issue with our 04 TB the headlights would not come on. (of course Murphy was involved as it was dark & RAINING)...anyway ...i pulled all 4 fuses they looked fine so i put them back in then tried the lights again & they came on & have worked fine since ( crossed fingers) i called the local dealer they had never heard of this problem and like i asked them how do you recreate something like this for them to check it !!!!

RE: 2003 Trailblazer Headlights
 

Have an '03 TB, 80K miles. The Low Beams just quite working (high beams are fine). Can't find anything wrong. I'll try the relays and let you know what happens. Thanks for the head's up.