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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?
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Wednesday, December 7th, 2011 AT 12:05 AM

31 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 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
  • 20,761 POSTS
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
  • 20,761 POSTS
There is no low beam relay in the circuit.
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Thursday, March 9th, 2017 AT 12:30 PM (Merged)
Tiny
  • MEMBER
  • 0 POST
  • 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
  • 48,601 POSTS
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
  • MEMBER
  • 0 POST
  • 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
  • 109,747 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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