Question about 2006 Hummer H3

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2006 Hummer H3, the low beam headlights are not working, checked fuses, checked relays, all are good, high beams do work, any suggestions

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Could be a bad ground wire for the low beams and or the hi/lo switch for the headlites

Posted on Apr 07, 2011

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Low beam headlight - passenger side - on my 2006 Buick Lacrosse does not work. I've tried a new bulb - no help. The fuse - underhood fuse box - for the low beam is good. There is no voltage to that fuse...


From Info I have looked at I believe under hood micro switch relay 35 is for low beam and 34 is for high beam. It also looks like you have a different fuse for each light. The relay are for both low beam or both high beams. each headlight has its own fuse. I believe #4 fuse under hood is for passenger side low beam. fuses 1-4 under hood are for the four headlights as I understand the info I have seen.

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Both low beam headlights are out.


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High beams work low beams do not


you don`t say if you have checked the fuses for the headlights.if the fuses are okay and you know that the low beam filaments are working.you may have to feed power and ground directly to the proper headlight prongs from the battery to make sure the bulbs are good.then it could be a relay for the low beams or a switch for the headlights.you don`t say if you have daytime running lights on this car as there is a module for this system that may be the problem for the now low beams.

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Headlights do not work. Beam works, park lights and other lights work. Bulbs ok


more than likely a fuse or a relay is bad. locate the fuse for the headlights (owners manual) and check if it is bad, if the fuse is good, find the relay and give it a flick or two and try the headlights then, if they work, its time for a new relay

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Low beam head lights not working - The low beams, both stopped working. The high beams work fine. I checked the fuses and all 4 are good. I even swapped the low and high beam fises just in case. No...


if the fuses are good then you need to check for power and ground at the headlight plug that attaches to the headlight bulb if you have a good power and ground there and the connections are good then the bulbs are both no good.or if you can tell the bulbs are burnt out by looking at them then you don`t have to check powers and grounds.you also can directly feed power and ground to the bulb and check both the terminals for high beam and low beam as you cannot tell which is which by looking at the terminals

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If high beams work and low beams do not, then it is probably the high/low relay. It is part number 15016745 and has four prongs. To test if your relay has gone bad locate the relay in your fuse box. There will be two of these relays located next to each other. One controls the low beam headlights and the other the cooling fan. Swap the relays and check your low beam headlights. If the low beams work you have a bad relay.

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Low Beam


Make sure you have a good switch
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