headlite mystery - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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2013+ Chevrolet Trailblazer Forum Discussion on the new upcoming 2013 Chevy Trailblazer

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  #1  
Old 04-15-2019, 03:47 PM
rfloydlewis rfloydlewis is offline
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2004 Chevy TrailBlazer LS
Cranberry Red Metallic 4.2L I6 2WD
Join Date: May 2011
Location: reedley ca
Posts: 20
headlite mystery

i have an intermittent failure of my low beam headlites. They simple shut off. The high beams still work. after a variable amount of time for 15 mins to overnite the low beams work. anybody?? i hate electrical problems.
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  #2  
Old 04-15-2019, 04:48 PM
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EnvoyBoy2004 EnvoyBoy2004 is offline
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2004 GMC Envoy SLT
Graphite Metallic 4.2L I6 4X4
Join Date: Sep 2014
Location: NY
Posts: 2,084
It is probably the Low Beam Relay #46 in the underhood fuse box. Try swapping it with #45 for testing purposes. When replacing this "relay", be sure to buy an OEM name brand such as AC Delco.
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  #3  
Old 04-17-2019, 04:04 PM
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vipergg vipergg is offline
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2008 Isuzu Ascender
Midnight Metallic 4.2L I6 2WD
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Agreed , replace relay, common item on this car . Was a recall item on the 2007-2008 years .
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  #4  
Old 04-17-2019, 07:45 PM
patrickkelley33 patrickkelley33 is offline
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2007 Chevy TrailBlazer LS
Silver Mist Metallic 4.2L I6 4X4
Join Date: Dec 2015
Location: chicago suburbs,IL
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It's definitely a relay I had the same problem
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  #5  
Old 04-24-2019, 09:19 PM
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longspur longspur is offline
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2005 GMC Envoy SLE
Liquid Silver Metallic 4.2L I6 4X4
Join Date: Jun 2007
Location: Southern Ontario Canada
Posts: 228
its not the relay - you will get the same issue happening again - from what I can find there is no solid fix for this issue. I have done the relay swap - no help - mine still occasionally flickers and sometimes goes out completely for a short period of time. I have learned to live with it.
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  #6  
Old 04-24-2019, 09:37 PM
tak1313 tak1313 is offline
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It's a known problem with the HDM (Headlight Driver Module), in normal speak, the headlight relay. There is a recent recall (circa 2016), but for TBs, the recall is only good for 2006 & 2007. The description states as follows:

"General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2005 – 2009 model year Buick LaCrosse (Allure) vehicles; certain 2006 – 2008 Saab 9-7x vehicles; certain 2006 – 2007 Buick Rainier, Chevrolet Trailblazer and GMC Envoy vehicles; certain 2007 Pontiac Grand Prix vehicles and certain 2006 Chevrolet Trailblazer Ext and GMC Envoy XL vehicles. The headlamp driver module (HDM) may not operate properly in the thermal environment of the underhood electrical center. If the HDM is not operating correctly, the low-beam headlamps and daytime running lamps could fail to illuminate. This failure could be intermittent or permanent. This condition does not affect the high-beam headlamps, marker lamps, turn signals, or fog lamps. Loss of low-beam headlamps, when they are required, could reduce the driver’s visibility, increasing the risk of a crash."

The fix is to replace the relay with 13506836. It's a little pricey for what it is - about $30ish bucks if you have to pay out of pocket.
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  #7  
Old 04-24-2019, 10:20 PM
mawhitealton mawhitealton is offline
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2009 GMC Envoy SLT
Black 4.2L I6 4X4
Join Date: Aug 2010
Location: Alton, IL
Posts: 2
Had same issue on '09 Envoy. Recall was for '07-'08 models. Replaced with new module from autozone for $30. Went to local GM dealer and told service dept that problem still exists on newer models. They ran my VIN and found mine was covered too and replaced with redesigned module (cost over $100) for free. Even copied my autozone receipt and sent me check a couple weeks later.
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  #8  
Old 04-25-2019, 08:26 AM
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rcott01 rcott01 is offline
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2004 GMC Envoy SLT XL
Black 4.2L I6 4X4
Join Date: Feb 2016
Location: Eaton, OH
Posts: 61
What vehicle do you have? if you have a Saab 9 7x with the HID headlights it could be A bad ballast also. I have a 2005 9 7x with the HIDs and I had so many problems with the ballast and the bulbs that I bought halogen housings and replace them, I have not had any problems ever since
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