Question about 2004 Chevrolet TrailBlazer

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Both headlights went out on my 2004 trailblazer LS. Light bulbs and fuses work fine. Could it be my relay or some sort of shortage? I have problems with the my headlight for months.

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Most likely the head light switch

Posted on Aug 04, 2010

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1 Answer

My headlights went out, but the bulbs are still working, how do I fix this problem


check for ,ore relays under the hood up by the fire wall. and check all fuses also.

Oct 10, 2012 | 2004 Chevrolet TrailBlazer

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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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Tail lights not operating. All other lights work. bulbs good. no blown fuses. 2004 trailblazer LS


If the tail light fuse is good, I would check the headlight switch for power on that circuit.

Aug 18, 2012 | 2004 Chevrolet TrailBlazer

1 Answer

Headlites went out, is this a bulb issue...


It sounds to me that if you checked all the fuses and they are fine that it could be the headlight switch needs to be replaced or very uncommon but possible that both low beam bulbs blew at the same time and need replacement.

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1 Answer

How to change the front headlight


You have to remove the front grill. I just recently had this problem and turns out bulbs were okay but relay switch had to be replaced..make sure its the bulbs and not a fuse or switch

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Was sent in by another poster, just posting his results which fixed mine. Problem was relay $50.00 at GM only.

Check the relay module. 45 or 46. on the engine relay block. you can swap the two they are the same part number, then you will know. Dont start the engine, just check the lights. If it works replace the relay module. You may have to order the part from the parts store. Or go to the dealer to get it.

Mar 18, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

2002 Trailblazer LS left rear brake light fails to light. Replaced socket assembly and bulbs with a set that works and it still fails to light when brakes are applied


I have the same problem with my 2004 Trailblazer LT. Driver side brake light does not illuminate. All other lights work fine. Replaced bulbs. Still does not illuminate. Cannot figure out which fuse goes to this light. Could it be a fuse?

Jul 28, 2008 | 2004 Chevrolet TrailBlazer

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