TB Headlights going off while driving - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 5.3L V8 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 09-04-2010, 03:25 PM
mandtx1 mandtx1 is offline
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2003 Chevy TrailBlazer LT EXT
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TB Headlights going off while driving

I need all the help I can get.... I have an 04 Trailblazer with 95,000 miles. The lowbeam headlights go out while I am driving. The highbeams and fog lamps continue to work along with all the dashlights. I have replaced the right side headlight bulbs at least every 3 months because it kept going out. Now both sides will go out while going down the road. I pull over, put it in park, and then the lights will come back on. Simple solution except when you are traveling down US 287 near Dallas at 70 mph with 3 kids in the car. Sometimes there is no where to pull over. Any suggestions?

Thanks,
Mandy
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  #2  
Old 09-04-2010, 05:13 PM
TxVoy TxVoy is offline
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I had the same problem. Just fixed it this weekend by replacing the # 46 relay as discussed here.

The part is about $28 at Autozone. It takes about 10 minutes to replace.
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Old 09-04-2010, 05:52 PM
mandtx1 mandtx1 is offline
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I'll try it...

Sounds logical to me. I knew that it was probably a relay but just didn't know which one. Thanks for the information and I'm sure all the drivers around me last night thank you as well.
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Old 09-04-2010, 06:58 PM
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BLAZEN03 BLAZEN03 is offline
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My brother has had the same issue, the relay was the issue!
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Old 09-04-2010, 08:17 PM
TxVoy TxVoy is offline
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Quote:
Originally Posted by mandtx1 View Post
Sounds logical to me. I knew that it was probably a relay but just didn't know which one. Thanks for the information and I'm sure all the drivers around me last night thank you as well.
Yeah! The first time it happened to my wife and I we were on a two lane road in the middle of nowhere. The headlights turn off and it goes COMPLETELY dark. That was scary.
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Old 10-01-2010, 07:47 PM
natek natek is offline
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my envoy has done this several times to myself and my family driving at night. thanks for the info.
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  #7  
Old 10-02-2010, 11:41 AM
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the roadie the roadie is offline
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And all owners should remember the emergency trick if you're not carrying a spare - just swap relays 45 and 46 and watch the temp gauge. You can live without the fan clutch for a while as long as it's not hot and you're moving 20-30 MPH or more. The fan clutch and the low beam relays are solid state units, not like any other relay in the vehicle, they're black, and next to each other.

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Old 11-09-2012, 11:18 AM
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sctex sctex is offline
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Thumbs up Yes - HDM #46 relay is the trick

Bought at Autozone for $35 and no problems after that! You can replace your self with ease.
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Old 11-09-2012, 03:15 PM
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Ray Dockrey Ray Dockrey is offline
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You do know you replied to a thread over two years old right?
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Old 03-06-2013, 03:02 PM
bcon bcon is offline
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In case anyone still looks at this thread I was wondering if anyone had any other solutions. Thought maybe the dash switch. I had previously noticed that the relay for the clutch is the same as the headlights so I swapped them to see if that would fix it but it still happens.

There's no pattern to when they go off. I've made sever all night trips and the lights never turned off and sometimes they'll go off within a few minutes of starting the vehicle. Since the lights are on day and night unless you manually turn them off there's no telling how often they turn off during the day but it definitely doesn't happen very often. I just don't want my wife flashing people (with the car).

Unless someone has had any other experience I guess I'll go ahead and replace the relay. Should probably replace the fan clutch relay too since they both had the same issue.
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