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Chevrolet TrailBlazer, SUV
#114 of 173 Re: 2003 Trailblazer Headlights Out [pdesimone]
May 14, 2010 (1:15 pm)
I have an 02 chevy trailblazer with the headlamps out. high beams work, but the low beams dont seem to come on. autozone had the dashboard switch for aprox. $106 but that wasnt it. i replaced the turn signal switch ($150) that wasnt it either. all the micro switches seem to work and all the fuses were good. when the power was applied to the the correct fuses the lamps came on so i knew they were good. finally we found that there is resistor that supplies power to the lamps. apparently that was burnt out. when bypassed the lamps came on. its on order and will be replaced this afternoon. final cost $60+ tons of frustration. lol
#115 of 173 Re: 2003 Trailblazer Headlights Out [frnkieb]
May 21, 2010 (8:10 pm)
Can you tell me where the resistor is, I have a trailblazer. The low beams go off and everything else works.
#116 of 173 2006 Trailblazer Low beams went out
May 25, 2010 (7:01 pm)
I have read a lot of other post about the low beams going out and the high beams still work. I have the same trouble. I traced it to the switch on the dash and that was 120.00. Well it didn't work. I checked both low beam head lites and they were both good. I have not tried to change #45 and #46 yet that will be tomorrow night. I looked at the wiring scamatic and have seen that there is a light sensor. According to the book this sensor makes the low beam driving lights dim during the day and turns them on even higher at night because it's dark. If it's not the 45 and 46 the only other thing it can be is that sensor. That is going to be a real pain to get to because it's in the dash near the windshield. If man maid it I will figer it out it just may take some time. If any one else has had this trouble and already knows would you please let me know what it is?
#117 of 173 Re: 2006 Trailblazer Low beams went out [marty54]
May 26, 2010 (7:42 am)
This is classic relay problem. I took the relay out several times trying to show it to different auto parts stores. I ended up having to special order it. In taking the relay out many times, this effectively scraped the contacts clean to bare metal. I have not had any problems with the relay since then, even after I received my new relay. New relay is in my glove box just in case, I'm going on 9 months now with the old relay after contacts were scraped clean (accidently) By the way, if you ever do need to get at that sensor on the top of the dash, it's VERY simple. The whole top part of the dash just pops right out, being very careful not to break that is. The plastic piece that holds it in place broke on mine, so I ended up using epoxy to fix it.
#118 of 173 trailblazer lowbeam problem. Good news.
Jun 20, 2010 (8:48 pm)
Just confirming that what i read on one of the post here is correct. my lowbeams work sometimes and sometimes not. mine is 2004. according to the owners manual, fuse schematic page 5-94 and 5-96 the fuse that causes this problem is #46(Headlamp Driver Module). it is one of the xtra large black fuses. Part#15016745 is marked on the top of the fuse. the fuse directly in front of this fuse is #45 (Cooling Fan). this fuse has the same part # so i interchanged the fuses and the lowbeams came on immediately!! happy!! i found the fuse online for approx. $35 but will check with dealer in the morning as it is midnight right now. this forum has really helped me save some money. i hope i have helped someone as well. thankx.
#119 of 173 Re: trailblazer lowbeam problem. Good news. [leilani5]
Jun 21, 2010 (8:31 am)
You're correct grasshopper. Note: when asking for this part, it is a relay, not a fuse. The e-bay price seems high, meaning I thought it would be 1/2 price or so. New one from Autozone is $39 part # 20601. Don't trust what part # that pops up on their website, it's not the right part. Try cleaning the old relay contacts with some fine sandpaper and try it. I have a new one as a back up in my glovebox, but cleaning the contacts worked for me.
#120 of 173 03 trailblazer low beam head lights out
Jun 26, 2010 (3:58 am)
I have an 03 trailblazer. Turned on truck last night and both low beams didn't come on. Just replaced both bulbs about 6 months ago when one of them went out. I put the good (old) bulb in to see if it was getting power and the light worked. I put the new bulb back in and oddly it worked. Tried to do the same thing on the other side and when I got the plug off noticed that one of the leads on the plug and bulb were burnt. Why would this happen? Can I just cut off the burnt plug and put on a new one? Is there something before the plug causing it to burn up? Like a relay or something? Or do they over time burn like that? Any suggestions? How or where to get the part? Easiest way to replace or fix?
#121 of 173 Cheapest way to test...
Jun 26, 2010 (5:30 am)
I have an 02 TrailBlazer LT. Shortly after I bought it I noticed the passenger low beam was burnt out. It also had the wires/plug burnt (some sites i've visited state that later years were not made of the same materials & they believed this to be the issue...but I am unsure). My husband fixed the problem on mine. Not too many months later we were driving down the hiway at night and lost all low beams. Not too sure why I did it, but I instantly flipped over to high beams and they worked fine. Pulled over, turned off the suv & restarted it & low beams were back. This went on for a few months. After searching HERE, on Edmunds, we followed the advice of another poster. Here is a copy of the post we read & followed: 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!b> **note that hubby & I left modules #45 & #46 this way & never bought a replacement for either & that was about a year back. I've had no trouble with either device :o) Hope this helps!!
#122 of 173 Re: 03 trailblazer low beam head lights out [sar1127]
Jul 06, 2010 (9:40 am)
I have an 03 TBLTZ and the driver side headlight went out. When going to change it the light came back on as if there was a short in the connector. The connector is melted and when the light does get connection, the connector gets so hot you can't hold it. I'm assuming I need to just get a new connector somewhere but I was wondering what was the cause of this as well. should I check out the 45/46 relays? Thanks for the help everyone.
#123 of 173 Trail Blazer Headlight Problem
Jul 07, 2010 (7:39 am)
I have a 2004 TB with 20000 miles.
After going through all the messages on this subject I may have found the answer in switching the relays #45 and #46. My symptoms are somewhat different(I think). When I park the TB after dark and then start it sometime later, the headlights do not work, neither hi or lo will come on. Last night after driving 2 miles and arriving home(miracle) the headlights came back on as I entered my driveway.
It(the problem) may be related to the fact that I had parked under some lights before turning the engine off. This is a stretch but had happened before under those circimstances. Very frustrating and scary.