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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 01-23-2017, 08:15 AM
Formula1 Formula1 is offline
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2005 Chevy TrailBlazer LS
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Headlights Out

Both of my low beam headlights stopped working at the exact same time. What are the chances of that! High beams work just fine. I checked the fuses under the hood and they are good. Are there more fuses somewhere else that I am missing.

Thanks, Chris

I have a 2005 Trailblazer 4.2
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  #2  
Old 01-23-2017, 08:53 AM
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dh4645 dh4645 is offline
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Quote:
Originally Posted by Formula1 View Post
Both of my low beam headlights stopped working at the exact same time. What are the chances of that! High beams work just fine. I checked the fuses under the hood and they are good. Are there more fuses somewhere else that I am missing.

Thanks, Chris

I have a 2005 Trailblazer 4.2
I just had to do this last year (and had to drive home over an hour with high beams on) , it was some sort of relay fuse. You can't tell they are bad by looking at them. I think it was like $20 at AA or AZ.

Edit.
I think it was that first one.
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Old 01-23-2017, 09:11 AM
Ranger160 Ranger160 is offline
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Most likely the headlight relay under hood. Mine did this.

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Old 01-23-2017, 09:19 AM
Formula1 Formula1 is offline
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I hope its just a relay. After reading a bit now, I see a few threads where there seemed to be no fix or maybe they just never reposed that it was the relay.
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Old 01-23-2017, 09:53 AM
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dh4645 dh4645 is offline
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I hope its just a relay. After reading a bit now, I see a few threads where there seemed to be no fix or maybe they just never reposed that it was the relay.
Well you are welcome.
Have a good day.
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Old 01-23-2017, 10:28 AM
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EnvoyBoy2004 EnvoyBoy2004 is offline
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Do not buy any headlight relay module other than AC Delco, most other aftermarket units have been known to fail. The relay location is in the underhood fuse box at location #46. For a quick confirmation of it is actually bad, take relay from location #45 and install in location #46.
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Old 01-23-2017, 09:28 PM
Formula1 Formula1 is offline
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Ok I did the relay swap and it did not work
So, what are the chances that both relays are bad?

And thanks everyone for the help
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Old 01-23-2017, 09:54 PM
Ranger160 Ranger160 is offline
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Of the two relays mentioned 45 & 46 one is for the fan clutch the other is for the low beams. There is always a possibility that both are bad. Keep us posted.

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Old 01-23-2017, 10:46 PM
Formula1 Formula1 is offline
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I got 2 new relays.....does not work!
now I will try bulbs...but I just put in new ones 2 months ago.
I guess its possible.
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Old 01-23-2017, 11:09 PM
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EnvoyBoy2004 EnvoyBoy2004 is offline
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Check fuses #3 & 6 in the underhood fuse box as well.
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