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Forum topic by AlaskaGuy posted 11-09-2018 05:15 AM 587 views 0 times favorited 15 replies Add to Favorites Watch
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AlaskaGuy

4632 posts in 2482 days


11-09-2018 05:15 AM

Need Auto mechanic with electrical skills.

My wife’s car is a 2012 Hyundai Elantra . Both high beam headlight went out at the same time. Low beams work normal. When you try to go to high beams the blue dash light comes on the the high beams don’t. I’ve looked at the fuse panel and the diagrams in the owne’s manual. I see nothing that indicates a headlight fuse or relay.

Anyone know anything about this problem??

-- Alaskan's for Global warming!


15 replies so far

View woodbutcherbynight's profile

woodbutcherbynight

5594 posts in 2582 days


#1 posted 11-09-2018 05:35 AM

I will scan a diagram and take a look tomorrow at work. It is possible the bulbs just went bad. And yes we have seen this happen, recently. Had a 2017 in last week for no low beams. Both were bad.

-- Live to tell the stories, they sound better that way.

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AlaskaGuy

4632 posts in 2482 days


#2 posted 11-09-2018 05:44 AM



I will scan a diagram and take a look tomorrow at work. It is possible the bulbs just went bad. And yes we have seen this happen, recently. Had a 2017 in last week for no low beams. Both were bad.

- woodbutcherbynight

Thanks, I be watching. I wouldn’t think both would go bad at that same time but evidently they can.

-- Alaskan's for Global warming!

View Lazyman's profile

Lazyman

2559 posts in 1561 days


#3 posted 11-09-2018 02:11 PM

BTW, headlights usually don’t a have a fuse — you don’t want the fuse blowing while you are driving. In some cars the switch itself may act as a breaker that you can reset by simply turning it off and back on. At least that is what someone told me years ago.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View Steve's profile

Steve

666 posts in 756 days


#4 posted 11-09-2018 02:18 PM

Check this thread.

https://www.justanswer.com/hyundai/9leer-2012-hyundai-elantra-high-beams-don-t-work-blue-high.html

“This failure is going to be the smart junction box. The multifunction switch is telling the body control module you want high beams and the BCM is telling the instrument cluster via the bright indicator. That leaves the SJB that powers the high beams to blame. There is not a headlight fuse to check.”

“The SJB is the fuse box under the left side of the dash that has an integraed computer in it. It requires diagnostic tool programming to replace it.”

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Steve

666 posts in 756 days


#5 posted 11-09-2018 02:21 PM

I believe there is a relay for the high beams in the fuse box. That could have gone bad as well. You can try switching it with the low beams to see if that’s the culprit.

This is from a sonata, but might be the same.

View GR8HUNTER's profile

GR8HUNTER

4914 posts in 886 days


#6 posted 11-09-2018 02:28 PM

If you locate the high beam relay and find that it doesn’t receive power when the high beam switch then the problem is either in that switch or the wiring In some cases a loose stalk-type switch can cause this problem although it’s more common to find that the switch has failed altogether :<(((

-- Tony---- Reinholds,Pa.------ REMEMBER TO ALWAYS HAVE FUN

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johnstoneb

3034 posts in 2346 days


#7 posted 11-09-2018 02:37 PM

Replace a bulb first. You may have had both high beams burn out. It doesn’t happen very often but I have seen it. Just try one bulb because those bulbs aren’t cheap.

-- Bruce, Boise, ID

View OSU55's profile

OSU55

1924 posts in 2163 days


#8 posted 11-09-2018 07:59 PM

I suspect its a relay – happened to me with a Chevy, and the low beam relay was the same. Swapping relays can prove it out. Very unusual for both headlight filaments to go at exactly the same time.

View MrUnix's profile

MrUnix

7004 posts in 2372 days


#9 posted 11-09-2018 08:10 PM

Replace a bulb first. You may have had both high beams burn out. It doesn t happen very often but I have seen it. Just try one bulb because those bulbs aren t cheap.
- johnstoneb

Or just pull the connector off and test with a multi-meter for voltage when the high beams are turned on.

As for both burning out at the same time – it’s possible, but I’ve seen more than once where one bulb burns out and the owner didn’t even realize it… until the other one did :)

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View AlaskaGuy's profile

AlaskaGuy

4632 posts in 2482 days


#10 posted 11-09-2018 09:36 PM


Replace a bulb first. You may have had both high beams burn out. It doesn t happen very often but I have seen it. Just try one bulb because those bulbs aren t cheap.
- johnstoneb

Or just pull the connector off and test with a multi-meter for voltage when the high beams are turned on.

As for both burning out at the same time – it s possible, but I ve seen more than once where one bulb burns out and the owner didn t even realize it… until the other one did :)

Cheers,
Brad

- MrUnix

*I’ve seen more than once where one bulb burns out and the owner didn’t even realize it… until the other one did :)* This is what I’m hoping for. I don’t drive it that often so the wife may have missed the first one burning out. Just in case I did buy 2 new bulbs. With my discount and all two bulbs at Napa what 20.98. Cheap diagnostic tool.

-- Alaskan's for Global warming!

View AlaskaGuy's profile

AlaskaGuy

4632 posts in 2482 days


#11 posted 11-10-2018 01:08 AM

Well I had my electronic wizard neighbor come over with his ohm meter. Both bulbs tested “no Continuity” :)

Installed 2 new bulbs….......Done…..

Thanks for everyone’s help.

-- Alaskan's for Global warming!

View woodbutcherbynight's profile

woodbutcherbynight

5594 posts in 2582 days


#12 posted 11-10-2018 04:06 AM

well, that takes care of my answer. LOL

BTW my normal approach to checking bulbs is a test light. Why bother with fuses and relays when you can just check and see power and ground yes / no? LOL

Alot of good advice given on this thread. Lots of things that can go wrong and yes they have tied BCM’s into the headlights and other systems and the BCM does fail… sometimes..

-- Live to tell the stories, they sound better that way.

View poopiekat's profile

poopiekat

4384 posts in 3908 days


#13 posted 11-10-2018 05:43 AM

I’d be looking for another electrical problem if both headlamps burned out together. A high surge of current from the alternator may have smoked both bulbs, for example. Does your alternator have an internal regulator?

-- Einstein: "The intuitive mind is a sacred gift, and the rational mind is a faithful servant. We have created a society that honors the servant and has forgotten the gift." I'm Poopiekat!!

View AlaskaGuy's profile

AlaskaGuy

4632 posts in 2482 days


#14 posted 11-10-2018 07:16 AM



I d be looking for another electrical problem if both headlamps burned out together. A high surge of current from the alternator may have smoked both bulbs, for example. Does your alternator have an internal regulator?

- poopiekat

There is no conclusive evidence they both went at the same time. It’s very possible one when out unnoticed until the other went out. If there is another problem I’m sure it will surface soon. “internal regulator” don’t have a clue at this point.

-- Alaskan's for Global warming!

View woodbutcherbynight's profile

woodbutcherbynight

5594 posts in 2582 days


#15 posted 11-11-2018 03:45 AM



I d be looking for another electrical problem if both headlamps burned out together. A high surge of current from the alternator may have smoked both bulbs, for example. Does your alternator have an internal regulator?

- poopiekat

Most vehicles from late 80’s and up have internal regulators. AG’s is internal.

-- Live to tell the stories, they sound better that way.

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