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Chevy TrailBlazer Headlight Questions

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  • Information on the fuse block begins on page 5-109 in the Trailblazer owner's manual. It should be on the driver's side of the vehicle. There's a diagram in there, as well, detailing the different fuses and relays and their locations.

    Hope this helps,
    Sarah
    GM Customer Service
  • Thanks everyone!
  • My daughter was stopped for having the driver side headlight out on our 2005 trailblazer. When I took it up to have the bulb replaced, they said that the bulb wasn't the problem, it was the contactor. Can this part be purchased at Autozone or someplace similar or does it have to come from a Chevy dealer?? If it has to come from GM, where can I get the part number so that I can order it online??
  • fj4072fj4072 Posts: 29
    You mean connector right? Go to Rockauto.com and buy it there, they are cheap and ship same day. Depending on which part you need there, use a high heat connector as this is a very common problem for us Trailblazer owners.

    rockauto.com has pictures there so you can match up perfectly, don't shy away from Dorman brand as it is a quality brand. Tons of us TB owners use this website to order parts because of they have price AND service....No I don't work for them :), just many great experiences with them myself. They have shipped within an hour many times for me.
  • rockauto.com rules!!!
  • First noticed that the left turn signal was doing double time which normally means a bulb out. Checked all bulbs and all are working. When I jiggled the high beam switch (same as turn signal) it would blink normally. Then next time start double time again. After a while when the high beam is on the left turn signal will blink once then stop. (Really not sure if related or not but the green arrow indicator on the dash stays dimly lit all the time. May be just picking up light from bulb behind meter cluster?)

    Also noticed that ALL front lights on the driver side are more dim than passenger side (high and low beam and turn signal and running light). It is very noticeable when driving. Not sure if the two situations are related.

    Here is what I have tried so far:

    Swapped the real tail light circuit boards. No change.
    Swapped the front head light assemblies. The one from the passenger side that had been bright became dim on the driver side and the driver side assembly became bright on the passenger side. So I am assuming it is not the lights, connections etc. as the problem stayed on the driver side even though the parts were changed.

    Checked voltage on both front sides. Reading just over 14 volts (same both sides).

    I swapped the high beam relay in the fuse box with another relay. No change.

    The turn signal relay uses the same relay for both right and left and em flashers (which flash normal speed by the way) so I don't think it is bad.

    My only thought now is that the turn signal switch is bad but a new one is $100+ so don't want to buy one if not needed. It may be causing the fast blinking, but not sure about the dim lights. Anyone have anything like this happen? I have read about some crazy electrical issues with the TB but nothing like this.
    Thanks
  • Ok more info for post 159 above- after checking today and noticing that the high beam light flashed when the turn signal was on (I could not imagine an electrical system where the high beam would be on the same circuit as the turn signal). Anyway, I was going to take the fuse box apart to see if there was anything melted or shorted out underneath and noticed that all the bolts were already loose (hand loose). I tightened them all up and PRESTO all the problems went away!! So after several hours of messing around I lucked into the fix. I think the dealer left the screws loose a while back they had to do some electrical work. The issues did not start right away so I did not make the connection (no pun intended). p.s. This vehicle is trouble waiting to happen! I would sell it but it's not mine!!
  • My lights have been staying on and draining my battery. I have a 2003 trailblazer. I have replaced my relay for the dimmers. We haven't ruled out #46 relay yet will be doing that tonight. I am almost positive it is not #46. Has anyone had this problem or have any other ideas of what it might be?
  • fj4072fj4072 Posts: 29
    After your vehicle is turned off or what? The TB's I've seen and it's been many, #46 has been stuck in the on position when the battery is being drained. If you're talking about the daytime running lights, there is an off switch. OR you could install a DRL killer.
  • Yes, after I turn the car off my daytime lights stay on and drain my battery. I went to buy #46 and it is $34.00 with no refund. I want to rule out all the possibilities before I buy this part and it be something else. Thinking it could be sensor or somethng in the wiring but not for sure. Where is the off switch? The different light settings switch inside the car does not work when I try to turn them off.
  • fj4072fj4072 Posts: 29
    Some years have an off setting on the dial, some don't. Mine does 03', turn the switch all the way to the left then try twisting a little bit more. Hard to describe, but it's kind of like a spring loaded switch. Twist the dial to the left past the point where it would normally just sit.

    Have you tried switching relay #45 with 46 to see if it turns off? If I were you I'd buy that relay anyway and have it just in case ($35 is a good price). In due time it will need to be replaced. Mine has already gone out and I still keep a spare. Also, is your DRL sensor at the windshield visiable or has it fallen into the dash (happened to me). If all else, look up DRL killer for trailblazers if your model doesn't have an off switch for the lights.
  • I have an '02 Trailblazer LS. Yesterday my driveside low-beam light was working, but one time it shorted out for a couple of seconds, then came back on. Today the low-beam light is out, as well as the high-beam light. Neither light will come on. I went to Autozone, replaced the low-beam bulb, and still neither will come on. I checked the fuses, and both were good. I tried switching #45 & #46, and still didn't work. Could someone please help me out! I plan on getting it fixed sometime tomorrow. I feel that it might be something basic. Again, both high & low beam lights will not come on. I took of the grille, and light about 20 minutes, replaced the bulb. Checked the fuses. Nothin'

    Thanks,
    Trevor Jones
  • burdawgburdawg Posts: 1,524
    Did you check for voltage at the connector when the lights are on? That's step 1. How did the connectors look?
  • I have a 2005 and mine was doing the same thing in JUly 11. I sure pissed off alot of people to.LOL But it was the only way home. I had to finally take mine to the dealership not once but twice. They fixed At the tune of 350 or so. I still have problems with it flickering every now and then but I haven't took it back. I've had lots of problems with this vehicle and I'm ready to get rid of it. Gas gauge went. wiper on back not working after the front quit working. Cd player not working. now none of the locks wanna work half the time and half time cant get rear door to even open. It has a mind of it's own. Also the transmikssion done started slipping. Never again will I buy a trailblazer.
  • i had same problem, just replace the black hdm relay #15016745.
    it seem to fix the problem for me.
  • I just bought this 2004 trailblazer in feburary. A week after buying, it randomly started cutting off when sitting at a redlight or just idleing. About a month later the driver side dim headlight went out, we changed the bulb and it didnt fix it. My husband got frustrated and knocked the crap out of it and it started working again. Everynow and then we would have to hit it to make it come back on. Soon after, the passenger side side started doing it, sure enough we could hit it and it would start working again. Now the driver side dim light wont work at all and the passenger side light wont stay on, still though, the brights work. We have tried changing the bulbs.

    In the past month the face vents for the ac have stopped working, the feet and defroster still work fine. Two weeks ago, the battery shorted out. Now the transmission will not shift into third gear, we tried changing the fluid and filter, there were also very few shavings that had been droppped. It just rolled over to 90,000 miles so i would think it to be in good condition. Could this be an electrical problem causing all of these problems or am I stuck with a lemon?
  • Fellas...
    I tried everything to find the source of my frustration in regards to the left low beam headlamp;
    1) checked the fuse
    2) the HDM relay (i even swapped with blower)
    3) Replaced socket to lamp, tests good.
    4) removed the grille and swapped headlamps, this only confirmed the left low lamp (wiring)is the culprit.
    5) To be determined. I tried to crack the fuse/relay but unable to.

    Any other suggestions?

    Early issue was the only intermittent operation with the headlamp...then after my Father In Law and I worked on it...it operated just fine and then a few weeks ago it no longer works. I am deploying soon and I don't want to leave my wife with less than acceptable car.
  • I just dealt with a 2006 Chevy trailblazer issue. The turn signal did not light on the front passenger side. A new bulb did not solve it. I replaced the flasher relay module, still did not solve it. the headlights started going dim and working sporatically. It turns out that there are four chrome raised bolts in the engine fuse box. They appear as they only hold the inside cover in place, as it snaps over them. I tightened these down and everything is working as they should. After quite a bit of money spent, I was glad to find this solution and had to share with the group. I would try this before heading to replacing the head lamp relay.
  • abrowerabrower Posts: 1
    I was driving down the road and the headlights just turned off, all running lights were on but headlights were of. They would not come back on even if I switched the headlights from automatic to manual. I would have to pull over turn off car and turn back on with the headlights coming on occasionally only to find them turn off again driving down the road. Any info would be great, don't want to keep having the headlights turn on and off while driving.
  • fj4072fj4072 Posts: 29
    Easy fix for this very common problem, replace your headlight relay in the fuse box under the hood (Drivers side next to the battery). If memory serves me, it's relay #43. 2 ways to get you out of trouble while on the road...#1. switch #43 with the fan relay #46 right next to each other (same exact relay). #2 take the relay out and put it back in 10-15 times, which will clean the contacts...sometimes this will work too.
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