Question about 2004 Chevrolet TrailBlazer

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Replaced left headlamp (3rd time) still will not come on

Replaced relay last year, could this be problem again?

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  • Anonymous Apr 04, 2009

    I have replace both headlight bulbs in my 03 trailblazer 3 times. The boot that it inserts into has melted each time.

    I have heard of other people having this problem with trailblazers



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Of course it could, the relays only last so long and some times the store bought ones last less time than the ones bought from the dealer.

Posted on Nov 26, 2008


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2010 impala high beams do not come on, light on dash comes on, replaced bulbs still don't work, checked all fuses, look good

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If all the items you listed were replaced then you have either a ground breach where no ground is reaching the negative post of the headlamps or there is no power source connection. Start with verifying power to the headlamp switch. If yes, verify power from the relay. If yes, verify power to the terminal at the headlamp. If yes, start with the ground circuit. If there is no ground connection you can save years of frustration by fabricating a new ground circuit from the body to the headlamp ground terminal. I'm going o get frowned upon for that but, hey, if it works for the time being, right?

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Headlight 2006 Colorado do not work high or low beams

I saw what you replaced. Did you do any testing, first? Anything electrical, always check voltage and ground for the component. Use a testlight.

There are right and left headlamp fuses in under hood fuse box. I doubt the fuses blew, but, you can check voltage at fuse circuit with headlamps on.
I don't know if there would be any applicable codes for headlamp system? You can check.
Your bcm has some control over headlamps.

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Both your low beam and your high beam is protected by the same fuse, so it makes sense that the fuse is OK if the high beam is working on the passenger side. There are 3 fuses for the headlamps. Fuse #13 in the Battery Junction Box (20 Amp). If this fuse is blown, the headlamp relay will not have any power and neither high nor low beam on either side will work (you will have no headlamps at all) Then there is Fuses #2 and #3 (15 Amp) in the Battery Junction Box. #2 goes to the left low and high beam and #3 goes to the right low and high beam.
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The headlamp relay is located under the dash to the left of the steering wheel. If it is the original relay, it will say "headlamp relay" on the side of it.

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go here. we can help you. Also, did you check the headlamp relay in the box under the hood? One relay is in box in front of battery, other is in narrow box along passenger side fender under the hood. swap left & rt headlamp relays to see if it changes.

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1997 Ford Aspire Low/High beam headlamps not working

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