Driver's side low beam does not work at night

Tiny
MARIO313
  • MEMBER
  • 2012 CHEVROLET TAHOE
  • 150,000 MILES
During the day my low beams work my high beams work but when it gets dark at night my driver side low beam cuts off. So I have to drive with my high beams. This problem only occurs at night on my driver side low beams. I have check the fuses fuses are good and ground is good.
Tuesday, July 13th, 2021 AT 5:08 PM

6 Replies

Tiny
COLBY_STEPHENSON2000
  • MECHANIC
  • 32 POSTS
Hello my name is Colby.

Sounds interesting, the vehicle has daytime running lamps. These bulbs are different then the low beam bulbs. Make sure you are not confusing the two. You may just have a bad low beam bulb. Would recommend removing the bulb and simple swapping with the other side to see if it works or not. Easy and fast way to diagnose and no parts required. :) Here is procedure for changing bulbs. If vehicle has HID headlamps then be careful to not touch the known good bulb.
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Wednesday, July 14th, 2021 AT 5:28 AM
Tiny
MARIO313
  • MEMBER
  • 3 POSTS
Thank you for the information. I swapped the bulbs out to check and it lasted a day or two then did the same thing. During the day time they work but at night the driver side low beam doesn't. How can you tell the difference between the low beams and daytime running lights?
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Wednesday, July 14th, 2021 AT 6:56 AM
Tiny
COLBY_STEPHENSON2000
  • MECHANIC
  • 32 POSTS
Does your head lamp assembly look like this? If so I labeled it for you. I want to make sure we are on the same page. Also don't want you to get the low beam and DRL daytime running lights mixed up. So let me know if the low beam is not working all the time and it's the DRL that has you thinking its the low beam. You can just turn the headlights on and walk out front of the vehicle and see if that low beam is coming on. If this healight is different then yours let me know or try putting an image of yours with the problem hopping on here.

Thanks,

Colby
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Thursday, July 15th, 2021 AT 5:12 AM
Tiny
COLBY_STEPHENSON2000
  • MECHANIC
  • 32 POSTS
Sorry my image is not showing what I wrote here is another one.
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Thursday, July 15th, 2021 AT 5:21 AM
Tiny
MARIO313
  • MEMBER
  • 3 POSTS
Oh, I see and I completely understand so your right my DRL have been on, but I have replace the low beam and also switch with the passenger side low beam. Could the DRL effect the low beam driver side at night?
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Friday, July 16th, 2021 AT 4:03 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

The left front is controlled by a relay in the fuse block. The body control module is what controls the relay to pass power to the connector.

I attached wiring diagrams for you to view the system. The yellow wire is what goes to the headlight. Check the relay for any corroded terminals.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

If you have a scan tool, you should be able to view the headlight application. The body control module is what controls the control portion of the relay.

Roy
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Monday, July 19th, 2021 AT 5:08 AM

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