How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Greg A Your Own Question

Greg A
Greg A, Master Troubleshooter
Category: Buick
Satisfied Customers: 6115
Experience:  Working with Electronics & Cars for 25+ Years
5229702
Type Your Buick Question Here...
Greg A is online now
A new question is answered every 9 seconds

My 2001 Buick lesabre limited has fast flashing on the left

Resolved Question:

My 2001 Buick lesabre limited has fast flashing on the left turn signal light. The front turn signal works, the back does not even though I've replaced the #3357 blubs repeatedly. What's wrong and how do I fix it. I tried to find a flasher, but nothing under the steering wheel that I can see.
Submitted: 5 years ago.
Category: Buick
Expert:  Greg A replied 5 years ago.

Hello & Welcome,

 

Do you have a test light or multimeter you can use to do some testing?

 

Thanks, XXXXX XXXXX

Customer: replied 5 years ago.
Probably not. Not sure what a multimeter is.
Expert:  Greg A replied 5 years ago.

Hi again,

 

That is a tool for measuring for voltage in an electrical system.

 

Let me ask you this: When you changed the bulb at the rear, did you notice any signs of damage or melting of the socket? Also, did you notice if there were any bent contact pins around the bulb?

 

thanks

Customer: replied 5 years ago.

Just change the bulb again today, and the bottom of the blub (which was still working and bright) did have a tiny bit of brown along the edge of the part that goes into the socket. No bent contact pins. PRobably is not relevant, but several of the #194 blubs were burned out. I keep a supply in my garage as I don't live close to the town where auto parts are sold.

I looked in the book that came with the car, and couldn't find anything that shows where to find the flasher unit (in case that is what is wrong). COuld that be it?

 

Expert:  Greg A replied 5 years ago.

Hi again,

 

It is probably not the flasher, as it is doing what is supposed to do. The "Fast Flash" is actually a symptom or result of one or more of the lights in the circuit being out or not connected.

 

It would be nice to have a measurement device to be able to test and see if you are getting power back there, or to see if there is a loose wire somewhere. I will check the schematics for this vehicle and see if there are any fuses between the flasher unit and the tail lights, but I don't think there are any.

 

Thanks, XXXXX

Customer: replied 5 years ago.
All the lights work. Just the fast left turn signal on the dash, and when I get out of the car, the front light is flashing fast, the rear isn't flashing at all. BUt all the lights are working.
Expert:  Greg A replied 5 years ago.

I believe you are referring to a light bulb that has two filaments in it, so if the flasher is not working at the back you may not notice it. This should be what the socket looks like and the signals coming in. Notice one is just for the parking light.

 

graphic

 

If you can, take a close look at the bulb in the socket and turn on the turn signal for the left side. Then do the same thing for the right side and compare the results. Do this with the parking lights switched on. If you can see a difference between the right and left sides, then that would say that there is a problem with wiring to that left side.

 

According to the label of the sockets, this light should also come on when using the brakes. Have you checked to see if that particular bulb comes on when the brake pedal is pressed. The left and right side should be doing the same thing when the brake is pressed.

 

Please let me know what you find.

Thanks, XXXXX

Customer: replied 5 years ago.

OK, just jumped in the car and drove down the road to a neighbor. He said that all the front signals work, but the left back brake light isn't coming on bright like the right side brake light. And of course, the back left turn signal wasn't working. But all the back lights are on (think theyare called daytime running lights, but not sure).

So the left side brake light isn't going bright when I pressed on the brake pedal.

Expert:  Greg A replied 5 years ago.

Hi again - sorry for the delay.

 

I finally found the schematic for the rear lights. Below is the schematic for the left side.

 

graphic

 

I highlighted the flasher module and the connector that goes to the left rear light for the brake and turn signal. Without a test light to check if power is making it to that connector that I have highlighted (C400) or the bulb socket, about all you might be able to try would be the flasher unit itself. According to the manual, it is located behind the left side of the instrument panel, above the data link connector. Here is a diagram of the location.

 

graphic

 

I would look at Pin F on that module and make sure it is connected before replacing the module. I would also suggest getting a 12 volt test light or multimeter and testing before replacing any parts. You may be able to get either of these tools at a local hardware store.

 

Please let me know what you find or if you need more information.

 

Take Care Greg A.

 

 

Greg A, Master Troubleshooter
Category: Buick
Satisfied Customers: 6115
Experience: Working with Electronics & Cars for 25+ Years
Greg A and 2 other Buick Specialists are ready to help you
Expert:  Greg A replied 5 years ago.

Here is what that C400 connector is supposed to be.

 

graphic

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Dave Nova

    Buick Technician

    Satisfied Customers:

    1718
    ASE Master Certification. GM World Class Certification
< Last | Next >
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Buick Technician

    Satisfied Customers:

    1718
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/PE/peterpete190/2012-2-24_1274_20120215135406.64x64.jpg Pete's Avatar

    Pete

    Buick Technician

    Satisfied Customers:

    1257
    15 years Buick Technician experience and training.
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Buick Technician

    Satisfied Customers:

    768
    15 years master GM tech and mater ASE tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Buick Master Technician

    Satisfied Customers:

    731
    ASE A1-A8 w/L1 GM master technician.Factory certified with 40 years experience.
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    411
    ASE Master 15+years
  • http://ww2.justanswer.com/uploads/MO/molurch/2012-6-6_214526_500.64x64.png Don 'Mo Lurch''s Avatar

    Don 'Mo Lurch'

    Buick Mechanic

    Satisfied Customers:

    393
    GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
  • http://ww2.justanswer.com/uploads/Rocket2005/2009-09-13_133703_jack.jpg cartech's Avatar

    cartech

    ASE Certified Technician

    Satisfied Customers:

    307
    master tech automotive shop owner and tech 25 years