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Low beam lights wont work for a 2004 trailblazer

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Assuming bulbs are good, replace Relay #46 in the underhood fuse panel.

Posted on Sep 25, 2010

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Lowbeam headlights wont work, brake lights are out and check engine light is on...changed th dimmer switch, no luck


For the low beam problem, Swap relays 45 & 46 in the underhood fuse panel. Relay 46 is for the Low Beams. If that fixes the light, replace the relay that cam out of position 46.
Since the high mounted brake light is working, that indicates that the brake switch is good. You need to check the bulbs in the rear tail light assembly, if they are good, check fuse #34.

Sep 01, 2012 | 2004 Chevrolet TrailBlazer

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Low beams on 2004 chevy trailblazer wont work but high beams work fine.lights all work automaticly


Try changing the bulbs. No. They didn't both burn out at once. You probably drove for a while with one headlight, and didn't know it.

Oct 26, 2011 | 2004 Chevrolet TrailBlazer

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2004 chevy trailblazer, Both low beam headlamps are out. Headlamps replaced(same problem). Fuses are good. High beams work fine.


There should be a relay for the low beams. Locate and replace, Or swap it with another relay to see if that fixes the problem.

Dec 27, 2010 | 2004 Chevrolet TrailBlazer

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2004 trailblazer, with no low beam. We replaced the dimmer switch, and it worked for 4 days, then low beams went out again. Is there a module somewhere that could be bad, and where would it be, is there a...


It's your #46 relay in the fuse box. Switch #45 and #46 the next time your lows go out. If you have lights now, that's it. Try cleaning the contacts on the relay and the fuse box first, which worked me. Or just buy a new one for around $20. Very common problem in TB's.

Nov 28, 2010 | 2004 Chevrolet TrailBlazer

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both low beam ights wont work on my VW 2000 beetle I have checked the fuses, bulbs, and relays what could be the problem

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Low Beam headlights not working


The daytime running lights run the high beam bulbs at low voltage so it sounds like you need to put the relays back where they were and either replace the low beam bulbs or repair the wiring to them.Also the relay you removed could be defective.

Dec 28, 2009 | 2004 Chevrolet TrailBlazer

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Wiring diagram for a 2004 chevy trailblazer


I need to rewire the headlights for a 2004 Chevrolet trailblazer ss. Got the high beams ok but can't figure out where the wires are for the low beam/running lights Where are they?

Dec 27, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

My low beam headlights wont work


you have a very expensive module that is in the fuse box. This module looks like a relay but costs about $79. it is decribed and low beam in the fuse box.

Sep 25, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

2004 chevy trailblazer low beams not working fuses good bulbs new


Check the relay or your head light switch has gone bad. 

Apr 06, 2009 | 2004 Chevrolet TrailBlazer

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