GMC

GMC Troubleshooting Questions? Ask a Mechanic for Answers

Ask an Expert,
Get an Answer ASAP!

GMC

GMC Sierra 1500 HD SLE: I have an '02 GMC Sierra and the headligh

Customer Question
I have an '02 GMC...
I have an '02 GMC Sierra and the headlights quit working. The DRLs still work, and the park lights come on with the night sensor, but NOT the headlights. I replaced the headlight switch with the same functions. Any thoughts?
Submitted: 2 years ago.Category: GMC
Show More
Show Less
Ask Your Own GMC Question
Answered in 8 hours by:
7/16/2015
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
FIX  IT MAN
FIX IT MAN, Master Technician
Category: GMC
Satisfied Customers: 17,513
Experience: Master Automotive Technician
Verified
Hello, my name is Bobby. Thanks for the question. Can you tell me if the brights still seem to work fine?
Ask Your Own GMC Question
Customer reply replied 2 years ago
No. As I said NO headlights work, bright nor dim. Only the DRLs in the day and the park lights come on with the night sensor.
Customer reply replied 2 years ago
Did you get my answer, Bobby? I have no headlights at all. Only DRLs and then marker lights only when the night sensor comes on.
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
Sorry for the delay. I have been unavailable. Did you still want some help with this?
Ask Your Own GMC Question
Customer reply replied 2 years ago
Yes.
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
Great. Lets see what we can do. I just need to know if you have a voltage meter to run some tests just to see where to start.
Ask Your Own GMC Question
Customer reply replied 2 years ago
Yes I have s digital volt/ohm meter.
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
Thanks. In the fuse box under the hood locate the headlamp relay. Start by checking to see if you can feel it physically click when you turn the head lamps on. If not then leave the key on and remove the relay. With it removed check the voltage at each of the 4 pins and tell me what the readings are.
Ask Your Own GMC Question
Customer reply replied 2 years ago
Yes it clicks.
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
Thank you. That is a god sign to start. If you remove the relay and turn the key on do you get battery voltage at two of the 4 terminals?
Ask Your Own GMC Question
Customer reply replied 2 years ago
Yep, sure do.
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
Thank you. It sounds like you have a ground issue at the left side of the dash above the fuse panel. There is a splice pack there with several wires going to it as a ground. This ground is probably loose or failing.
Ask Your Own GMC Question
Customer reply replied 2 years ago
I appreciate the answer, but without a pic or diagram I'm not quite sure where you are talking about.
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
Let me see if I have a picture of it.
Ask Your Own GMC Question
Customer reply replied 2 years ago
OK. That would help. If it is the problem.
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
Still checking. My main database does not have them.
Ask Your Own GMC Question
Customer reply replied 2 years ago
OK. Let me know if you come up with something that will help.
Customer reply replied 2 years ago
I'm being asked to rate your service. I decline to do so as my issue is far from fixed. Any questions? Dave
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
Please do not rate. Over the last day or so my system has been down. If possible give me until tomorrow to see if I can resolve this. If I cannot I will opt out and allow someone else to help you.
Ask Your Own GMC Question
Customer reply replied 2 years ago
OK. I wasn't going to rate yet.
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
I do not have a diagram for this ground. The best I can explain it though is to remove the fuse box cover on the left dash fuse box. If you look at the box and look up and to the far right of the opening you will see the ground splice pack. I would also check the ground connections of the negative battery cable. Especially the one at the front of the frame on the passenger side.
Ask Your Own GMC Question
Customer reply replied 2 years ago
OK. Well none of that seems to be the issue. I ran a direct ground to each light individually and nothing has worked. Now what?
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
If the relay is clicking and if you have power to two terminals at the relay then you are losing power at this point between the relay and the headlamp. It may be in the bottom of the fuse box where you are losing it. I would check for power at the headlamps and then work your way back to the fuse box. Check the connectors on the frame rail under the master cylinder also.
Ask Your Own GMC Question
Customer reply replied 2 years ago
At this point it sounds complicated. I'm just going to have to take it to the dealer and get it fixed by someone who knows what to do.
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
It definitely is sounding like a fuse box issue. If you would like I can opt out and see if anyone else can help you.
Ask Your Own GMC Question
Customer reply replied 2 years ago
I have power at all the fuses in the electronic center and the dash fuse box. So I'm at a loss.
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
If you have power at all of the fuses and not at the lights themselves then you are losing it between the fuse and the light. The power leaves the relay and goes to each headlamp fuse. Once it leaves the fuse it goes through the fuse box and to the head lamp. If it is not making it to the headlamp then you have a loss of power either at the fuse box or between the two. That is why you would need to trace the wires from there.
Ask Your Own GMC Question
Customer reply replied 2 years ago
From the headlights to as far in the loom as I can trace there is no power. I would physically have to separate all the wires in the loom. There hasn't been a wreck or anything.
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
Then the loom should be fine. The issue will more than likely be at the bottom of the fuse box.
Ask Your Own GMC Question
Customer reply replied 2 years ago
I'll have to check it tomorrow when there's some more light.
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
Let me know what you find.
Ask Your Own GMC Question
Customer reply replied 2 years ago
There seems to be nothing obvious at the fuse box. There wasn't power to everything but I don't know what they all go to, so .
GMC Mechanic: FIX IT MAN, Master Technician replied 2 years ago
At this point you are going to need to test the wires from the fuse box to the headlamps to find the issue. It has to be in the fuse box from what you are explaining. If you want I can opt out and allow other experts to take a look and see f they have other ideas.
Ask Your Own GMC Question
Ask FIX IT MAN Your Own Question
FIX  IT MAN
FIX  IT MAN
FIX IT MAN, Master Technician
Category: GMC
Satisfied Customers: 17,513
17,513 Satisfied Customers
Experience: Master Automotive Technician

FIX IT MAN is online now

A new question is answered every 9 seconds

How JustAnswer works:

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

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

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!!!!

AlexLos 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.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, 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.

EstherWoodstock, 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.

RobinElkton, 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.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,696 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,542 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

GMC Technician

563 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

255 satisfied customers

18+yrs experience. State Inspector & GMC Diagnostics/Repair

George H.

George H.

ASE MasterTechnician

225 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

Don - Mo Lurch

Don - Mo Lurch

ASE Certified Technician

216 satisfied customers

GM, GMC, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics

< Previous | Next >

Related GMC Questions
1997 GMC Suburban. Crank, but no start. Battery replaced.
1997 GMC Suburban. Crank, but no start. Battery replaced. Distributor cap replaced. Good spark, but no fuel on spark plug. Dropped gas tank and no power to fuel pump. No voltage across pins 87 and 30 … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Have a 2003 gmc Envoy. Headlights shut off while randomly
Have a 2003 gmc Envoy. Headlights shut off while randomly driving, when it's idling sometimes it just shuts off. But it always starts right back up. Also lately I have had to essentially stomp the ped… read more
Lou P. master tech
Lou P. master tech
Mercedes Benz master tech
Bachelor's Degree
649 satisfied customers
I️ have a 2003 Gmc Envoy my headlights randomly shut off as
I️ have a 2003 Gmc Envoy my headlights randomly shut off as I'm driving. I️ have already replaced the relay. I'm looking for someone to walk me through the steps of diagnosing and fixing this problem.… read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
The battery on my 2008 acadia went flat charged it up but
The battery on my 2008 acadia went flat charged it up but now the car wont start and there is no power to the tailgate. When I turn the key all I get is a clicking noise from the fuse box … read more
roy
roy
Associate Degree
3 satisfied customers
Will not idle, just noticed that the negative battery cable
Will not idle, just noticed that the negative battery cable is disconnected, also there is a hollow line along the drivers side just under the hood that is broken. Not sure if this is causing the stal… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
3,927 satisfied customers
Battery died, charged up, restarted - radio locked, to
Battery died, charged up, restarted - radio locked, hoe to unlock? 2015 gmc terrain … read more
Don - Mo Lurch
Don - Mo Lurch
ASE Certified Technician
Vocational, Technical or Trade Scho
216 satisfied customers
Battery is dead all of a sudden. symble on dash = Battery
battery is dead all of a sudden. symble on dash = Battery malfunction It's a 2013 Acadia … read more
AZTechBrian
AZTechBrian
ASE Certified Technician & Shop Owner
Vocational, Technical or Trade School
732 satisfied customers
Will defective O2 detectors drain the batteries? New
Yes, Pulled fuses 1 by 1. Sitting idle battery is drawing 4 amps. … read more
roy
roy
Associate Degree
3 satisfied customers
With the engine running an turn the headlight switch on the
with the engine running an turn the headlight switch on the engine goes into reduced power mode. If you pull the dimmer the engine dies. … read more
roy
roy
Associate Degree
3 satisfied customers
2005 jimmy, headlights wont work, took the cover off the
2005 jimmy, headlights wont work, took the cover off the relay for headlight power in the fuse box under the hood, manually closed the contacts and the lights come on. what sends the power to the coil… read more
Mechanic01
Mechanic01
1,141 satisfied customers
I was cleaning the battery cables and reattached them and
I was cleaning the battery cables and reattached them and now the truck will not start. … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
1,888 satisfied customers
Hard starting. New battery, it cranks great, acts like no
New battery, it cranks great, acts like no fuel or no spark.. Changed plugs,wires,both O2 sensors, throttle position sensor, mass air flow sensor. Hasn't changed the start. Runs great after a few seconds running rough … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
563 satisfied customers
Battery light was on this am but alt is charging. Battery
Battery light was on this am but alt is charging. Battery was dead but is 6 years old. … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
2004 envoy headlights on low beam dont work the high beams
2004 envoy headlights on low beam dont work the high beams are working fuses and lamps are good … read more
Mechanic01
Mechanic01
1,141 satisfied customers
There are 6 terminals on a parking/headlight switch in a
There are 6 terminals on a parking/headlight switch in a 1989 GMC C1500 1/2 ton pickup truck. I currently have no parking or taillights, fuses are good. I would like to test the switch to see if it is… read more
tim37857
tim37857
Mechanic
High School or GED
71 satisfied customers
I have an 05 GMC Yukon, when I turn my headlights on the
I have an 05 GMC Yukon , when I turn my headlights on the light (right turn signal) under my right headlight cones on & stays on. Only when the headlights are on does this happen. & when I turn my rig… read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
563 satisfied customers
The driver side headlight is stuck on high beam, how do I
the driver side headlight is stuck on high beam, how do I fix it? … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,696 satisfied customers
Battery goes dead overnight, BAttery is good. Alternator is
BAttery is good. Alternator is good. I have pulled every fuse and can't find a circuit that is causing the draw. … read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,542 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x