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Chevy TrailBlazer Headlight Questions

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  • Stever@EdmundsStever@Edmunds YooperlandPosts: 39,041
    Here's the start of one thread about changing the bulb:

    mark77, "Buick Rainier, Chevy TrailBlazer, GMC Envoy" #17319, 6 Oct 2005 10:36 am

    You can use the Search This Discussion box there if you want to find more posts. Or just post again if that link doesn't help and we'll try to help you get your lights on again. :shades:

    Steve, Host
  • eagostoeagosto Posts: 3
    ANYONE, PLEASE: HOW DO I REPLACE THE LOW-BEAM PASSENGER-SIDE HEADLIGHT ON MY TRLBL '01 OR '02? ANY HELP WILL BE APPRECIATED ALTHO IT LOOKS LIKE THIS TOPIC HAS BEEN THE SOURCE OF A LOT OF DISCUSSION BEFORE. THANKS. eaa
  • eagostoeagosto Posts: 3
    EUREKA! I figured out how to replace the passenger-side hi and low headligts on my '02 Trailblazer. I didn't replace the driver's side, but it doesn't look as daunting as the passenger side. I hope this helps.

    1.FACE THE VEHICLE SO THAT BATTERY IS ON YOUR RIGHT;
    2.REMOVE THE BLACK PLASTIC PIECE THAT RUNS OVER RADIATOR BETWEEN HOOD LATCH AND FAN. IT IS ABOUT 53 1/2" LONG AND HOLDS THE HOOD PROP CLIP. (3 PLASTIC PUSH RETAINERS & 2 SHEET METAL SCREWS);
    3.REMOVE THE GRILL ASSEMBLY UNDERNEATH THE PIECE IN STEP 2 BY PUSHING DOWN FIRMLY ON 4 RETAINER CLIPS WHICH RUN ALONG THE TOP. USE A WIDE SLOT SCREWDRIVER. PULL UP GENTLY ON GRILL ASSEMBLY. IT WILL POP OUT. THE GRILL ASSEMBLY EXTENDS UNDER EACH HEADLIGHT ASSEMBLY (HA) AND IT DISPLAYS THE CHEVROLET LOGO IN THE MIDDLE. MY GRILL ASSEMBLY POPPED OUT EASILY AND ALL THE OTHER RETAINER CLIPS ON THE BOTTOM AND BENEATH AND TO THE SIDE OF HA WERE AUTOMATICALLY RELEASED WITHOUT ANY FUSS;
    4.ON TOP OF HA SEE ONE TAB (ABOUT 1" LONG)ON THE RIGHT SIDE AND ONE ON THE LEFT (THE ONE ON L IS CLOSER TO THE FENDER);
    5.PULLUPWARDDIRECTION ON TABS. THEY WILL SLIDE UPWARD A COUPLE OF INCHES AND WILL RELEASE THE HA WHICH YOU CAN THEN PULL OUT TOWARDS YOU;
    6.AT BACK OF THE HA, REMOVE 2 ROUND RUBBER CAPS (ABOUT 4" IN DIAMETER)--ONE FOR LOW BEAM--ONE FOR HIGH. REVEAL BULBS. UNSNAP THE WIRE HARNESS FROM BULB BASE AND TURN BULB 1/4 TURN CLOCKWISE (REMEMBER YOU ARE FACING THE TRUCK)
    7.REPLACE BULB(S). #9006 BULB IS GRAY-BASE, FOR HIGH BEAM ON OUTSIDE. #9005 IS BLACK-BASE, LOW BEAM TO INSIDE OF HIGH BEAM.
    CHANGING HIGH AND LOW AND REASSEMBLY TOOK ABOUT HALF HOUR. GOOD LUCK. eaachevy
  • This Guy was right on .. helped me with my 2004 trailblazer..
    i had to change my driver side lowbeam lamp
    for the '04 ,, it seems a bit easier though ... here are the steps i took : with borrowed input from eagosto(ETA 15 min - for your first time,, next time it may be faster) This also applies to the front turn signal bulbs.

    Tools needed - large Flat head screwdriver

    1.FACE THE VEHICLE SO THAT BATTERY IS ON YOUR RIGHT;
    2. OPEN HOOD
    3.REMOVE THE GRILL ASSEMBLY BY PUSHING DOWN FIRMLY ON 2 RETAINER CLIPS WHICH RUN ALONG THE TOP. USE A WIDE SLOT SCREWDRIVER TO HELP YOU WITH THE REST OF CLIPS (1 IN THE MIDDLE 2 BOTTOM END,2 ON EACH SIDE IN BETWEEN THE HEADLIGHTS). PULL UP GENTLY ON GRILL ASSEMBLY. IT WILL POP OUT. THE GRILL ASSEMBLY EXTENDS UNDER EACH HEADLIGHT ASSEMBLY (HA) AND IT DISPLAYS THE CHEVROLET LOGO IN THE MIDDLE. MY GRILL ASSEMBLY POPPED OUT EASILY AND ALL THE OTHER RETAINER CLIPS ON THE BOTTOM AND BENEATH AND TO THE SIDE OF HA WERE AUTOMATICALLY RELEASED WITHOUT ANY FUSS;

    4.ON TOP OF HA SEE ONE TAB (ABOUT 1" LONG)ON THE RIGHT SIDE AND ONE ON THE LEFT (THE ONE ON L IS CLOSER TO THE FENDER);
    5.PULLUPWARDDIRECTION ON TABS. THEY WILL SLIDE UPWARD A COUPLE OF INCHES AND WILL RELEASE THE HA WHICH YOU CAN THEN PULL OUT TOWARDS YOU;
    6.AT BACK OF THE HA, REMOVE 2 ROUND RUBBER CAPS (ABOUT 4" IN DIAMETER)--ONE FOR LOW BEAM (WHITE BASE CONNECTOR)--ONE FOR HIGH (BLACK BASE CONNECTOR). REVEAL BULBS. UNSNAP THE WIRE HARNESS FROM BULB BASE AND TURN BULB 1/4 TURN CLOCKWISE (REMEMBER YOU ARE FACING THE TRUCK)
    7.REPLACE BULB(S). #9006 BULB IS GRAY-BASE, FOR HIGH BEAM ON OUTSIDE. #9005 IS BLACK-BASE, LOW BEAM TO INSIDE OF HIGH BEAM.

    -- NOTE--- if you have small hands ,, you could take off the caps and bulbs without doing the above,, but the connector to the bulb is very short and maybe a bit cumbersome to install the bulb. (again took me 15-20 min,, but now that i know what to do,, next time may just take me 5-10 min) This also applies to the turn signals.
  • Hey: who out there knows how to replace the bulb on a 2004 Chevy Trailblazer LT
  • Thanks for the info - made the job a breeze.
  • I bought an '06 Trailblazer SS on a year end clearance a couple of months ago and decided to install the Sylvania Silverstar lamps, which I put in my pickup a month ago with outstanding results. I discovered immediately the grill would have to come off to remove the headlight assembly. Its just like the '04 described except the low beam is on the outside and both high and low beams use #9006. I hate popping these plastic pieces apart unless absolutely necessary-too easy to break something. So I took the 53" plastic cover with the hood prop clip off and easily replaced the lamps by reaching down and removing the rubber covers on the back of the assembly. A pen light was helpful. I'm 60 with stiff hands, so I think most can do it this way and not mess with the grill and headlight assemblies. Just be careful not to touch the glass on the new lamps, or if you do, be sure to wipe them off with a clean, dry rag. These things get blistering hot and a fingerprint can cause an excessively hot spot, causing the lamp to burst. Good motoring to all!
  • dennycdennyc Posts: 1
    The suggested method of accessing the rear of the headlight assembly to change the bulb works great. I followed iowapack's instuctions and changed the passenger side headlight in 25 minutes. I'm certainly no mechanic and it was very easy, no grill to remove or fenders to loosen!
  • jsetojseto Posts: 2
    I wanted to change the passenger side headlamp. Man, I tried to follow the instructions but had a heck of a time getting the front grille off. So, I went another route.

    (While standing in front of the vehicle, battery to the right)

    I removed the right metal fender brace that covered the air filter cover. I loosened the front bolt, and removed the back one. This allowed me to "swing" it out of the way.

    I removed the air filter cover. There are three screws. One in the back, one on the right side, and one in the front-left. The one on the front-left is a little tricky so I used a long screwdriver and magnatized the screwdriver so I don't lose the screw.

    After removing the air filter cover, I lifted air filter and swung it out of the way. This gave me great view of the back of the headlamp. With one hand, I pressed down on the wire loom that blocked the rubber cover. Just using my hands, I peeled away at the rubber cover to expose the headlamp.

    With a small quarter-turn I removed the blown headlamp and reversed this process for reassembly.

    Took all of 10 mins. I'm sure that it would not be as easy for the driver side, as I would have to remove the battery. Hopefully, that one doesn't blow out any time soon. LOL.
  • I have nothing to add to reply #11 posted above but that his procedure works great on 2003 TB's as well. The clips are a b*%#h to slide back into place however!!!
  • lvenemalvenema Posts: 2
    My 2005 Trailblazer has had an intermittent problem with the headlights dimming since it was new. It usually only happens shortly after the engine has started after sitting quite a while. It happens after the vehicle has been driven for a few miles, the lights are on auto, and the heater/AC is on max blower speed.

    The last time it happened was during a snow srtorm. I had just about everything electrical turned on and it dimmed the lights off and on for about 30 minutes. It seems like the electrical system can't put out enough power.

    The dealer has applied fixes in all applicable TSBs with no fix. GM Tech support says this is normal? Somehow I just can't see that it is normal to have lights dimming while you are driving down a dark highway.

    Anyone else have problems like this that have been fixed?

    Thanks,

    Lou
  • lisa31071lisa31071 Posts: 1
    Thank you so much.. These instructions were perfect. It only took us about 10 minutes. Without out your help I would have never figured it out. :)
  • tuskertusker Posts: 1
    I replaced the driver side low beam. All I had to do was remove the battery cover and battery and I was able to pull the round rubber cover off and twist the light bulb assembly right out. Just be careful when you replace the bulb. Make sure you DON'T TOUCH THE BULB WITH YOUR BARE HANDS! This could cause the bulb to explode!
  • pdesimonepdesimone Posts: 6
    I have a 2003 Chevy Trailblazer. Just recently, both of my headlights went out. Whether I have it in the automatic position or if I put them in the "manual on" position, they don't come on. When I put on my brights, they work. At least they got me home. I'm sure I pissed some people off though. Anyway, does anyone have any ideas of where to look. I checked the fuses. There is a different fuse for each headlight and they both look OK. Could it be the bright switch, and if so, how do I check it? Looking forward to any help you can shed on the subject.
    Thanks
    Phil
  • pdesimonepdesimone Posts: 6
    Sorry if this went out twice but, I'm not sure what I did.
    Anyway
    I have a 2003 Chevy Trailblazer. Just recently, both of my headlights went out. Whether I have it in the automatic position or if I put them in the "manual on" position, they don't come on. When I put on my brights, they work. At least they got me home. I'm sure I pissed some people off though. Anyway, does anyone have any ideas of where to look. I checked the fuses. There is a different fuse for each headlight and they both look OK. Could it be the bright switch, and if so, how do I check it? Looking forward to any help you can shed on the subject.
    Thanks
    Phil
  • tblazedtblazed Posts: 945
    Low beams are driven by a module in the underhood fuse block. #46 is the Headlight Driver Module ("HDM") which is a solid-state relay. This is becoming a common failure. You can test it by temporarily swapping it with #45 the "Cooling Fan" driver module for the fan clutch as they are the same type device. If that's it you will likely have to buy the replacement from a GM dealer. Prices can vary from about $25 to over $40 for that module depending where you buy it. Good Luck!
  • pdesimonepdesimone Posts: 6
    I swapped #45 with #46 like suggested, but my headlights still don't come on. What are the chances of both modules going bad? #45 is the "Cooling Fan" driver module. When I swapped them, the main fan still went around. I don't know if it controls the speed of the fan or the fan all together.
    What are the chances of both of my low beams going out at the same time? Is there a highbeam/lowbeam switch on the column and could that be bad? How would I check this? Can I check the low beam with a test light. I'm trying to check everything before I have to go to a Chevy Dealer.
  • tblazedtblazed Posts: 945
    The fan will still turn. The driver module for the fan controls the amount the fan clutch is engaged and the fan speed. There is a minimum amount of drag in the clutch so even at minimum it will still turn, just not very fast.

    The headlight driver module (HDM) is controlled by the Body Control Module (BCM) under the back seat via a pink-white stripe wire that connects to the HDM pin 5 under the hood. The headlight switch signals the BCM to turn on the headlights. There are a few tests you could do to narrow it down to the BCM but that would involve shorting the pink-white stripe wire at the BCM or pin 5 at the HDM to ground, which will make the HDM turn on the headlights. DO THIS AT YOUR OWN RISK! You should be able to pull up the HDM slightly to get under it to pin 5, then with a suitable clip lead to ground and probe like a piece if solid wire, touch the pin. Be aware that there is direct Battery 12V on pin 2 so don't accidentally short that pin to ground or sparks will fly! You could also test both headlamps by taking them out and checking with an Ohm meter. Should read near zero Ohms. Pretty unlikely though that both would fail at the same time. Likewise with the two fuses.

    Since yours is a 2003 it shouldn't have a HDM fuse #53. I believe that fuse was added in late 2004 but you might check for that anyway to make sure.
  • pdesimonepdesimone Posts: 6
    Thanks for the info.
    Before I dove into the BCM, I decided to check for juice at the bulbs themselves. I seemed very unlikely that they would both blow at once, that's why I didn't check it right off the bat, but that's what it was. On the 2003, it looks like it's hard to get to the bulbs, but it was easier then I thought. The passenger side, I had to take off the cover for the air filter and I could reach my hand in. In any case, two lights and only $16. later, it was all fixed. Now, why did they both go at once. I had noticed a slight dimming a couple of times in the near past and I read somewhere that the Trailblazer had some alternator spiking problems. I guess I'll have to keep my eye on it.
    Thanks for your help.
  • pdesimonepdesimone Posts: 6
    I own a 2003 Trailblazer and I just had to replace 2 low beams. I don't know if things have changed from 2002 to 2003, but on the 2003 it looks harder than it really is.
    On the driver's side, reach down and in and pull off the black rubber cover that's about the size of the bottom of a soda can. Then just reach in and twist and pull. On the passenger's side, you first have to take the 3 screws out of the air filter cover and pull it off. Then, reach down and in and twist and pull. It was. Remember, don't touch the halogen bulbs with your fingers, the oil on your fingers screws them up for some reason. At least that's what they used to say. Hope this helps.
    Phil
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