Headlight Low Beam Problem! - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Exterior Exterior repairs/modifications

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  #1  
Old 10-26-2008, 08:03 PM
emoralesitt emoralesitt is offline
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Headlight Low Beam Problem!

I have a '04 Envoy that both driver and passenger sides headlights are out. It's not the bulbs, i replaced both of them. i checked the fuse and the fuse is fine, so i tested the wiring of the connector of the headlamp, and on both sides passenger and driver, i'm getting a short with all of the wires. theres 2 sets on the connector. the hi beams and the low beams and they're all shorted. what else can i check to fix my problem.

-manny
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  #2  
Old 10-26-2008, 08:26 PM
91RS 91RS is offline
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If the wires are shorted the fuse would be blown. Does the light on the dash come on when the switch is flipped? Is it just the lowbeams or are ALL the lighbulbs in the headlight out? What about the rear bulbs?
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Old 10-26-2008, 08:54 PM
emoralesitt emoralesitt is offline
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the dash lights come on and the rear lights all work fine. It's just my low beams.
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Old 10-26-2008, 09:23 PM
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mfizzy mfizzy is offline
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did you check the headlight module fuse #52. It is toward the back of the fuse box.
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  #5  
Old 10-26-2008, 09:32 PM
emoralesitt emoralesitt is offline
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just checked it out and fuse #52 is working fine.
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Old 10-26-2008, 10:10 PM
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tblazed tblazed is offline
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Try temporarily swapping #45 Cooling Fan relay and and #46 HDM relay in the underhood fuse block, and see if the low beams come on.
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Old 10-27-2008, 04:36 PM
emoralesitt emoralesitt is offline
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I swapped both relays 45 and 46 and they came on. Now what does this mean which one of my relays is bad or is it a bad relay.
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Old 10-27-2008, 06:22 PM
91RS 91RS is offline
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Quote:
Originally Posted by emoralesitt View Post
I swapped both relays 45 and 46 and they came on. Now what does this mean which one of my relays is bad or is it a bad relay.
If you tried a different relay in there, and the lights work fine now then the relay is bad. Less than $10 at the dealer (I can't remember how much it is off hand).
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Old 10-27-2008, 07:16 PM
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tblazed tblazed is offline
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The one originally in the HDM #46 socket is bad. That relay is actually is a solid state module, not a conventional relay, and will cost you anywhere from $25-45 at the dealer.
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Old 10-27-2008, 07:26 PM
badfishracing badfishracing is offline
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Thanks.

I know this is an old thread, but thanks. I tried everything I could think of. Not a mechanic by trade BUT an electrical engineer. Then I search for 'low beam' and read about HDM relay. Right there. Now if I only knew what HDM was, I might have figured it out on my own.

Darin
BadFishRacing
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