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 Paul M ASE Master Your Own Question

Paul M ASE Master
Paul M ASE Master, ASE Master Tech
Category: Chevy
Satisfied Customers: 4681
Experience:  ASE Master Tech 20+ Years
Type Your Chevy Question Here...
Paul M ASE Master is online now
A new question is answered every 9 seconds

Chevrolet Suburban 1500 LT: I have a 2002 Chevy Suburban.

Resolved Question:

I have a 2002 Chevy Suburban. My dash lights go out when the headlights come on. I have checked the voltage at the ILLUM fuse and it does vary when I turn the dimmer up and down. What else should I try?
Submitted: 11 months ago.
Category: Chevy
Expert:  Paul M ASE Master replied 11 months ago.

Hello I'm Paul and I will help you with an Answer to your Question

 

there is a common failure with the headlight switch that causes this problem

 

I am attaching the testing information

 

click here to view test

 

suspect a bad headlight switch

 

Remember to rate my answer positive so I get credit for my help.

 

If you need more help just log in to the site and reply the question will remain for follow up.


Paul

Customer: replied 11 months ago.

Hi Paul.


 


I retested the voltage at ILLUM and now don't see the voltage vary when I turn the dimmer up and down. I'm pretty sure it did that before.


 


Jumping the Orange and Light Blue wires behind the switch had no effect. I assume it was the larger Orange that was indicated (there is also a smaller one). The clock light went out as it does when I turn the headlights on.


 


 

Expert:  Paul M ASE Master replied 11 months ago.

does the orange have 12 volts on it?

 

When you jump the Orange 12 volts to the Light Blue does the dash Light up?

 

does the ILLUM fuse have 12 volts to both sides with the Orange jumped to the Light Blue?

Please answer the above questions and I can tell you the next step in testing

 

Paul

Customer: replied 11 months ago.

Both Orange wires have 12V. The larger one is in the "B" position. The smaller one is not labeled, but would be "D". The Light Blue is "A".


 


Jumping Orange "B" to Light Blue "A" causes the clock light to go out. I do not see any dash lights. It is daylight, so I'm going by the clock light.


 


With the jumper in place, there is no voltage on either side of the ILLUM fuse. One side causes my digital meter to fluctuate, but mostly in the mV range.


 

Expert:  Paul M ASE Master replied 11 months ago.

the light blue feeds the ILLUM fuse

 

if you jumper power 12 v to the Light Blue from the Orange and the ILLUM fuse has no power the Light Blue wire is broken between the headlamp switch and the ILLUM Fuse

 

are you sure your getting a good reading on the fuse?

 

if no power on the fuse ILLUM but power at Light Blue then the wire is broken somewhere between headlamp switch and the fuse... (often problems occur inside the fuse panel under the fuse...

take a 12 volt jumper wire and touch the fuse the dash lights should come on... if so you need to find the open circuit in the Light Blue wire between the headlamp switch and the ILLUM fuse

 

I am attaching a wiring diagram so you can see how it runs

click here to view

let me know what you find and if you need more help

 

Paul

Expert:  Paul M ASE Master replied 11 months ago.

sorry for any confusion but looking at the diagram

 

the Light Blue first feeds the INT Park Fuse #24

 

does this fuse have power? with the light blue jumped?

 

disregard the last message test the INT Park Fuse rather than the ILLUM fuse

 

Paul

Expert:  Paul M ASE Master replied 11 months ago.

I just studied the diagram in depth

 

jump the Orange to the Dark Green B to K

 

does the ILLUM fuse get power and dash light uP?

if so but it does not with the headlamps on and dimmer turned up the headlamp switch is bad

 

sorry for the confusion I had to dig into multiple diagrams to get this figured out

 

Paul

Customer: replied 11 months ago.

Okay, I will go test this. It's a bit of a walk, so sorry for the delays between messages.


 


BTW, jumping the Orange "B" to the ILLUM did light up the dash, so we're making progress.

Expert:  Paul M ASE Master replied 11 months ago.

ok let me know what you find

Customer: replied 11 months ago.

Jumping Orange "B" to Dk Green "K" did cause the dash lights to come on. Are you sure this indicates the switch is at fault? Why did the first document you linked instruct to jump the Lt Blue?

Expert:  Paul M ASE Master replied 11 months ago.

the original diagnosis was from a technicians database

 

the Light Blue is for illumination when park light relay is on

 

the Dark Green actually feeds the Illumination fuse

 

it gets 12 volt feed from the Orange wire through the Switch when (Park or Headlights are on) to the Dark Green

 

if Orange has Power

 

and Headlight switch is on and Dark Greek does not get power coming out of the switch with dimmer set to on position then the Headlamp switch is bad.

Power from the Orange 12 volts... runds Through the headlight switch/dimmer to the Dark Green ..

 

so if you plug in the headlamp switch and turn headlight on there is no dash lights

 

but if you jump the Orange to Dark Green they come on Headlamp switch is bad for sure

 

sorry for the confusion but not sure who wrote the original diagnostic I attached

 

but the headlamp switch is bad

 

Paul

Paul M ASE Master, ASE Master Tech
Category: Chevy
Satisfied Customers: 4681
Experience: ASE Master Tech 20+ Years
Paul M ASE Master and 6 other Chevy Specialists are ready to help you

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:

 
 
 
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
< Last | Next >
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
  • 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
 
 
 

Meet The Experts:

 
 
 
  • Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
< Last | Next >
  • http://ww2.justanswer.com/uploads/TI/tim37857/2011-10-28_23053_S6301814.64x64.JPG Tim's Auto Repair's Avatar

    Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Chevrolet Technician

    Satisfied Customers:

    6870
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Chevy Technician

    Satisfied Customers:

    5404
    15 years GM master tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Master A.S.E Automotive technician

    Satisfied Customers:

    4071
    A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
  • http://ww2.justanswer.com/uploads/RO/rodcuda/2011-7-25_224114_Donhoff1.64x64.JPG Neal's Avatar

    Neal

    Chevy Mechanic

    Satisfied Customers:

    2306
    Shop Owner and Mechanic on multiple makes.
  • http://ww2.justanswer.com/uploads/goodwrench9124/2008-11-09_220838_dscf0007.jpg goodwrench9124's Avatar

    goodwrench9124

    ASE Certified Technician

    Satisfied Customers:

    2041
    Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Chevy Tech -

    Satisfied Customers:

    1912
    18+yrs experience. State Inspector and Chevy Diagnostics