Why don't my low beam headlights work?

Tiny
ROQROME
  • MEMBER
  • 2007 BUICK LA CROSSE
  • 85,000 MILES
My low beam headlights don't work, high beam works and running lights work. I replaced the low beam bulbs they still do not come on. I checked the old bulbs with a meter and they are ok. Can you tell me why they are not working and how much it will cost approx. To get it fixed?
Wednesday, December 7th, 2011 AT 12:05 AM

31 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Hello,

It looks like it could be a fuse please check all headlight fuses. If the fuses are okay there is a high beam relay that if it is not working will cause the low beams not to work, here is a guide and a wiring diagram so you can test for power and test the relay.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

and

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

Please run some tests and get back to us so we can continue helping you.

Best, Ken
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Thursday, March 9th, 2017 AT 12:28 PM
Tiny
WALTERMICHALIK
  • MEMBER
  • 1 POST
  • 2007 BUICK LA CROSSE
  • 54,000 MILES
The low beam headlidhts stopped working I put in new 10 amp fuses but that was'nt the problem what do I do next? Walter M
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Thursday, March 9th, 2017 AT 12:30 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
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Test for power and ground at the light and post the results here.
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Thursday, March 9th, 2017 AT 12:30 PM (Merged)
Tiny
15DENNIS
  • MEMBER
  • 1 POST
I have the exact same problem with my 07 Buick lacross.
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Thursday, March 9th, 2017 AT 12:30 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You're welcome to read this thread but it belongs so someone else so if you want to ask questions, please start a new question of your own.
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Thursday, March 9th, 2017 AT 12:30 PM (Merged)
Tiny
BRIANOGLESBY
  • MEMBER
  • 3 POSTS
  • 2007 BUICK LA CROSSE
  • 96,060 MILES
Where is the low beam relay located
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Thursday, March 9th, 2017 AT 12:30 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
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There is no low beam relay in the circuit.
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Thursday, March 9th, 2017 AT 12:30 PM (Merged)
Tiny
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  • 2007 BUICK LA CROSSE
  • 54,000 MILES
Is this a common problem with this car?
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Thursday, March 9th, 2017 AT 12:30 PM (Merged)
Tiny
ACEPA1001
  • MEMBER
  • 1 POST
  • 2011 BUICK LA CROSSE
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
My low beams and side lights stopped without warning. The auto light control continues to working plus high beams. What is the possible cause?
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Thursday, March 9th, 2017 AT 12:31 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
There are three different types of headlights for this and we need to know what type you have in order to give a correct answer.
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Thursday, March 9th, 2017 AT 12:31 PM (Merged)
Tiny
CHARLESM0N21
  • MEMBER
  • 1 POST
  • 2006 BUICK LA CROSSE
  • 240,890 MILES
I'm having a problem with my low beam headlights it turns off when I only driving at night. I have tested the headlamp, mini fuse, wire connection, battery voltage, I replace the relay switch (#35 on under hood fuse/relay box), check the light switch and replace the power cable. After all that the headlights sill turns off, first dimming low lowest before turning off when I pull check the relay it is hot to the touch like its getting a lot of voltage where would it come from? A module? Or another relay? Or it is something else? How can I balance this out, I have taken my car to a shop they couldn't figure out the issue.
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Thursday, March 9th, 2017 AT 12:31 PM (Merged)
Tiny
HMAC300
  • MECHANIC
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Check the ground by headlight they are behind headlights on bar and check grounds on engine 1 by transmission on a stud and the other behind lh head. Make sure they are clean and tight. This cold also be a module problem so if that doesn't stop it from doing that then have it scanned.
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Thursday, March 9th, 2017 AT 12:31 PM (Merged)
Tiny
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  • 2006 BUICK LA CROSSE
  • 85,000 MILES
Low beam headlamps will not come on. I replaced both bulbs, the fuses are good, but the contacts for the fuses are dead, I tried all different configurations with the light switch with no results. The parking lamps operate. I would suspect a relay but have no schematic. Do the relays pull straight out of the fuse box? Thank you Patrick Gallamore
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Thursday, March 9th, 2017 AT 12:31 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuses underhood fuse box
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Thursday, March 9th, 2017 AT 12:31 PM (Merged)
Tiny
  • MEMBER
  • 0 POST
  • 2008 BUICK LA CROSSE
  • 52,000 MILES
Driver sid e low beam headlight went off
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Thursday, March 9th, 2017 AT 12:31 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
CHeck bulb and fuses.
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Thursday, March 9th, 2017 AT 12:31 PM (Merged)
Tiny
JOHNBOWDEN
  • MEMBER
  • 2 POSTS
  • 2006 BUICK LA CROSSE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 66 MILES
The low beams went out on my car. Fuses are good, but there is no voltage going to them. The manual says there is a circuit breaker in the under-hood fuse block, but I do not see anything like that. There is a mini relay for the high beam, but not low beam. Also, the high beams and parking lights work normally.
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Wednesday, January 23rd, 2019 AT 6:00 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Micro relay 35 in diagram.
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Wednesday, January 23rd, 2019 AT 6:00 PM (Merged)
Tiny
JOHNBOWDEN
  • MEMBER
  • 2 POSTS
Number 35 micro relay is for the high beams, which are working properly.
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Wednesday, January 23rd, 2019 AT 6:00 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
That is not what my database shows. Databases can be wrong, sometimes. Wiring below. Let us know.
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Wednesday, January 23rd, 2019 AT 6:00 PM (Merged)

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