05 Trailblazer Lights Dim - 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 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 01-23-2008, 06:37 PM
roscocoop roscocoop is offline
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05 Trailblazer Lights Dim

I've been noticing that when I start my vehicle that the lights dim, or flicker for a few moments and that my voltage guage goes back and forth when the lights flicker. My dash lights and headlights do this. Any ideas on what could be causing this?? It only does it for a minute or two. Thanx
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  #2  
Old 01-23-2008, 06:49 PM
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SilverUnicorn SilverUnicorn is offline
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Is the vehicle under load when started? Like is the heat or defroster set to "on" before you start the truck?

Do you have an aftermarket stereo that sucks alot of juice that may be on at startup? It may take a moment for the electrical system to compensate for any of these things.

Just a thought.

Oh, and WELCOME!

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  #3  
Old 01-23-2008, 06:51 PM
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no worries, my 06 has done it since day one, I think most of them do. Come to think of it, my 02 did it as well.
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  #4  
Old 01-23-2008, 07:16 PM
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This is fairly common and really nothing to worry about. I started a thread when my '05 started doing the same thing, back in, well...'05. Anyway, I posted a link to the thread below. It has a bunch of people reporting the same problem as you, several methods/attempts to fix, diagnose, and isolate the problem (mostly unsuccessfully) and some theories on what could be causing it. I don't think we've got it figured it out, but at least this will let you know that you aren't alone with this, and it probably won't cause any significant issues.

http://forums.trailvoy.com/showthread.php?t=2214
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  #5  
Old 01-23-2008, 07:43 PM
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mine does it too...
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  #6  
Old 01-23-2008, 07:47 PM
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Quote:
Originally Posted by SATBLS View Post
This is fairly common and really nothing to worry about. I started a thread when my '05 started doing the same thing, back in, well...'05. Anyway, I posted a link to the thread below. It has a bunch of people reporting the same problem as you, several methods/attempts to fix, diagnose, and isolate the problem (mostly unsuccessfully) and some theories on what could be causing it. I don't think we've got it figured it out, but at least this will let you know that you aren't alone with this, and it probably won't cause any significant issues.
Yeah, it's a design thing, we just don't know why they designed it that way.
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  #7  
Old 01-24-2008, 11:55 AM
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i believe its because 1st thing when turned on is....
The alternator DOES NOT start to pump out juice for a few seconds.. I dont know the time- but theres a delay from when the engine comes on to the alternator being commanded to start putting out.
Everything is working off the battery......
and
in 05 I think is when they put in the AIR pump.
It also runs when you 1st turn on the vehicle. that little pump draws some current. It gets worse if it has water in it (failing valve)- since it appears to draw more power.
eventually the little motor turns off and the alternator comes on. tuhs the dimming and lights getting bright.
thats what Ive picked up from here over time.
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  #8  
Old 01-24-2008, 12:33 PM
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My '04 Rainier does the same thing and has the air pump.

I tried most of the fixes suggested in other threads. Now that I installed a remote start that is all over and done with by the time I get behind the wheel.
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  #9  
Old 01-24-2008, 12:38 PM
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all trailvoys have an AIR pump.

mine does this during cold (and by cold i mean 20*F or less) all the time, maybe for 10 seconds at the most. It is the Air Pump that is drawing insane amounts of power (for a blower motor).

if you're driving around and you notice your lights dim as you let off the gas, the AIR Pump is probably activating, which is perfectly normal because it's trying to burn unused Hydrocarbons (gasoline) in the exhaust pipe before it gets to the catalytic converter. It's for emissions.
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Old 01-24-2008, 12:50 PM
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DonWs05 DonWs05 is offline
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Quote:
Originally Posted by roscocoop View Post
I've been noticing that when I start my vehicle that the lights dim
Minor point but don't forget that if your lights are on WHILE YOU'RE CRANKING it will be normal for the lights to dim because of the current draw of the starter. Just thought I'd throw that in. I've read the other posts, haven't seen this issue in my 05 TB.
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