headlights shut off while driving at night - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Audio and Electronics Discuss car audio, video, navigation, alarms, and other electronics here.

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  #1  
Old 03-22-2008, 10:44 PM
soulride soulride is offline
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2003 GMC Envoy SLT
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headlights shut off while driving at night

i have a 03 envoy slt, when driving at night the head lights shut down when driving. all at diffrent times, sometimes not at all. the light on the headlight switch on the dash is on, but will not turn the lights back on. the highbeams still work. anyone else have the same problems.
thanks
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  #2  
Old 03-22-2008, 11:45 PM
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Diablo03 Diablo03 is offline
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2003 Chevy TrailBlazer LS
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the headlights on our trucks suck....it is a possiblility that the plugs are going bad. this happened to my taillights and after i replaced the plugs they were fine.
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  #3  
Old 03-23-2008, 03:26 PM
soulride soulride is offline
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thanks for the reply... what i dont under stand is how both lights go out at the same time... and what is strange is sometimes they turn back on. did both your tail lights go out at the sametime? it's going to be hard to reproduce at the repair shop. it's kinda like the WB's dancing frog
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  #4  
Old 03-23-2008, 06:33 PM
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Diablo03 Diablo03 is offline
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if it's both of them then there is a possilbility that your relay is bad or going bad. maybe you could replace that and see if the problem goes away.

also does this happen when you have the headlight seitch in the auto position, the manual on, or both....if it's only the auto then your sensor could be going bad.

if you have a little more info i might be able to narrow down the issue.
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  #5  
Old 03-23-2008, 11:11 PM
soulride soulride is offline
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thanks for taking the time to help me out. i have the switch in auto position, but when the lights go out i turn it to the on position and the lights dont turn on.
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  #6  
Old 03-24-2008, 03:51 AM
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ten15machine ten15machine is offline
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I had an old Ford that did that, and it was related to the headlight switch. Apparently it would overheat, causing a spotty connection. May have been related to aftermarket bulbs that drew too much power, but I don't recall. I replaced the switch and all was right.

Just a thought.
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  #7  
Old 03-24-2008, 08:15 AM
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cargodz cargodz is offline
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I know this seems like an obvious, but did you try replacing the fuse? On some rare occassions a fuse will crack on the end where it's not visible, but since it's got play in there it will sometimes work and other times not... If you didn't replace it (and only checked it) then you may wanna try replacing it before you go digging into everything else... Trial and error problems, always start with the cheapest thing first
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  #8  
Old 03-25-2008, 09:24 PM
FloridaFitz FloridaFitz is offline
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2003 GMC Envoy SLT XL
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I am experiencing the very same problem. Anyone know where the relay is located. This may be a DIY project. Man it's scarry. No warning....the lights go out and stay out for a while. Very dangerous. GM should have a service bulletin out on this problem...but there have been so many problems with the Envoy...guess this one will have to get in line. New to the forum...looks great.
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  #9  
Old 03-25-2008, 09:51 PM
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tblazed tblazed is offline
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Quote:
Originally Posted by FloridaFitz View Post
I am experiencing the very same problem. Anyone know where the relay is located..
HDM (headlight driver module) #46 in the underhood fuse block, which you can swap temporarily for a test with the #45 Cooling Fan driver module. They are the same type solid state relay.
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  #10  
Old 03-26-2008, 07:01 AM
FloridaFitz FloridaFitz is offline
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Tblazed
Thanks for the info. Problem with the swap test is we never know when the blackout will happen, and of course, it's only noticable at night. Should probably purchase a new relay and replace the fuse...just in case. Great forum!
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