Low Beam Headlight Wiring Problem - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 21 (permalink) Old 05-13-2015, 02:56 PM Thread Starter
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Low Beam Headlight Wiring Problem

So my driver's side Low Beam has some kind of wiring issue. I can wiggle the wires going to it and it will come on if I get it just right, but I'm not sure how to fix this permanently. I guess I could cut some wires and splice some newer ones in, but I'm concerned it's a connection in part of the actual harness that connects to the wires leading to the light or the wiring connection to the low beam itself. Not sure how to check. The other side works just fine, high beam works great too. If I remote lock/unlock my car both lights turn on (not sure if it's high or low beam though) but that low beam just doesn't like me or something.

I'm sure if I take it somewhere it will cost a lot because it's wiring. Any ideas on a DIY fix I can try?
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post #2 of 21 (permalink) Old 05-13-2015, 06:54 PM
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i had a similar issue with my stock headlights, behind your headlights has a black "quick connect" so u can disconnect your headlight harness from your cars harness, in my case GM had forgotten to use some silicone sealant and this quick disconnect rusted completely out so i cut it out and wired the headlight directly and everything has been fine since. not sure if this is your issue but my car was doing the exact same thing only it was my passenger side.
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post #3 of 21 (permalink) Old 05-13-2015, 07:05 PM Thread Starter
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I wonder if I could just buy a simple quick connector and use that after removing the old one?
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post #4 of 21 (permalink) Old 05-14-2015, 04:57 AM
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Should be able to buy the pigtail, yes. If that's the issue.

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post #5 of 21 (permalink) Old 08-25-2015, 04:14 AM Thread Starter
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Would this work

DormanŽ 645-681 - Headlight Connector

Not sure which wires would connect to which...maybe it comes with a diagram?
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post #6 of 21 (permalink) Old 08-25-2015, 05:04 AM
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As long as that's the one that needs to be replaced. Just match the leads to the current one and only replace one lead at a time.

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1998 Chevrolet Cavalier - Wrecked/Donated
2007 Chevrolet Cobalt LT - M62 Supercharger, Ported Throttle Body, 42 lb/hr Injectors, Intense 2.9" Pulley, Cobra Heat Exchanger, SS/TC Exhaust, TTR Engine and Trans Mounts, Trifecta Tune, ZZP Header and Downpipe, '08+ FE5 Struts/Shocks, SSC Springs, FE5 Control Arms, SS/SC Front Swaybar, Powell Hardcore Rear Swaybar, 18" MSR 045s, Dunlop ZIIs, Nightshaded Tails/Side Markers, Shorty Antenna, Black Bowties, Black Grilles, Black Headlights, Dual JL 12" w1v2 Subs, A/D/S Front/Rear Speakers, Pioneer 7" Touchscreen, G85 Recaros, Leather Rear Seats, 160 MPH Cluster.
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post #7 of 21 (permalink) Old 08-25-2015, 05:32 AM
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cant buy just a pigtail, unless u can find one used, GM sells this pigtail as part of the headlight harness, so u end up having to buy the whole headlight assembly
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post #8 of 21 (permalink) Old 10-02-2015, 10:37 PM Thread Starter
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Ok, so I fixed my headlight after trying a lot. I ended up buying a new harness for both male and female sides of the plug. After reconnecting the 2 I found that my headlight was still out. I then decided to check the fuse just for kicks and replaced the hi beam with the low and BAM lights on. So yeah, it was the fuse. I didn't think it was possible since the light was coming on when I turned the alarm on/off.

Now I have a new issue: My dash lights for my MPH/RPM and A/C area don't come on. So at night I can't see anything on my dash except my mileage and my radio. Any idea why this is happening or what would cause it/how to fix it?
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post #9 of 21 (permalink) Old 10-03-2015, 01:42 AM
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When both tail light bulbs burn out or the circuit is open the BCM turns the instrument panel lights off to let you know you have no taillights.

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post #10 of 21 (permalink) Old 10-03-2015, 10:46 AM Thread Starter
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So I need to look for a BCM fuse then? Taillights are fine. What would cause the Circuit to be open? A guy at Oreily's said it was most likely the dimmer, I really have no idea though.
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