Yellow half-dome light on top of dash

[deansandri]

What is this yellow half dome light on the dash for? I don’t see anything in the owners manual about it. Sometime it’s on and sometime it’s off. What is it telling me. Any car whisperers out there?

 

[The Genesis Genie]

It means your high voltage battery is charging your 12-volt battery.

 

[deansandri]

Thanks. I could not find anything in the owners manual on that.

 

[JBattan]

There's absolutely no reason to have it, since we can't control it nor even care.

 

[gvjim]

There's absolutely no reason to have it, since we can't control it nor even care.

Considering all of the 12v battery problems that EGMP owners have experienced, I personally am very happy to see that yellow light glowing away.

 

[CRMS]

And on all EVs I'd have one of these 12v battery monitors:

Amazon.com

 

[G-192889]

It means your high voltage battery is charging your 12-volt battery.

Should this light be lit constantly? I’ve had issues with my 12V going dead twice now. Thanks.

 

[MDB]

I've owned my GV since October and have never seen the yellow light come on, until this week. Twice this week the light was on when I got in my car to drive to work in the morning. No change to my driving pattern. What are the possible explanations...and does this mean my 12v battery is in trouble!?

 

[Zcd1]

I've owned my GV since October and have never seen the yellow light come on, until this week. Twice this week the light was on when I got in my car to drive to work in the morning. No change to my driving pattern. What are the possible explanations...and does this mean my 12v battery is in trouble!?

It's more likely that you just haven't been there to see it when it was lit previously...

 

[noremacnova]

does this mean my 12v battery is in trouble!?

No! It means that Hyundai shouldn't have put that light there to begin with! Your chances of (1) seeing it on, and (2) trying to figure out if that's a good or bad thing, are low. The only thing you can do is stay up to date on all the ICCU recalls, and plan on a worst case possibility -which is a dead 12V battery some day. The best plan in that circumstance is to (1) carry a backup booster battery in the frunk, and (2) carry your physical door key with you so that you can get into the frunk in the event of a 12V power outage.

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[Yefchak]

Has anyone actually used a backup booster battery to do this? I bought a NOCO GB20 and have it in the frunk, with a monthly reminder on my phone to confirm that it's fully charge. I saw a video of someone using a similar booster to start an EV. They needed to use manual safety override button (because the 12 V battery level was so low that the GV20 couldn't sense that the polarity was hooked up right). But it worked, and nothing exploded.

I really hope I don't have to figure this all out in the middle of the night in a rainstorm...

 

[Looney100]

I’ve boosted the car several times with a pack. It is no more complicated than it would be with an ICE vehicle.
Remember to keep a physical key on you, because fob or cell phone access will not work if the battery is dead.

 

[Yefchak]

I’ve boosted the car several times with a pack. It is no more complicated than it would be with an ICE vehicle.
Remember to keep a physical key on you, because fob or cell phone access will not work if the battery is dead.

Does that mean your 12-V battery failed (because of the ICCU?) “several times” already?

 

[Hanabanana]

Back to "The Lamp"...please pardon my rant...I promised to never mention it again, but...

Not only is the now-infamous "indicator lamp" useless as a monitoring device/method/system component, (I'll bet nobody ever took an effective action based on that lamp) it is poorly 'explained' in any manual references, and now, in that information vacuum, there are all kinds of interpretations of just what that light indicates. Is the12v battery actually charging, or is the Battery Saver trying, but unsuccessfully? How would we know? Did it just turn off because the battery is charged, or is Battery Saver just switching off to try again (and how soon? nobody knows) because the battery did NOT charge? Is the lamp on because it's attempt #1, or #7, or...? Have a seat and wait, watch, wait, watch...oops, you didn't watch well enough...start over. The "Indicator lamp" is a confusing, useless distraction that provides no actionable information. "It's on. What to do?...It's NOT on. What to do?"..."It's off and on and off. What to do?"...same answer for each and all...nobody knows.

If the monitoring function is the intent, put in a gauge I can see right now, or, put the readouts that control the 12v charging circuit where I can retrieve them. Don't just tell me to watch it for 20-200(!) minutes. (My Ioniq 6 manual says Battery Saver+ will try 10 times to achieve a 12v charge, then give up if not successful, but that's all it says, no advice.) I assume it's essentially the same software with the GV60?

If it is a high-voltage warning light, it should/must be well-labeled as such. It definitely is not labeled as such....it is not labeled as anything.
This is just part of Hyundai's Ioniq 6 svc manual high-voltage warning system protocol to techs (I don't have the GV60 svc manual to compare):



...not exactly an intermittent, dim light that you can't even see from the major working areas of the vehicle, is it?

From the GV60 owners manual (WMITW)* page 32 of 719, as a small, pixelated image with the caption:

"2. High voltage indicator Lamp status Details
OJWEVQ011116NOJWEVQ011116N (image ID)
High voltage electricity flowing
(Charging 12V auxiliary battery or scheduled air
conditioner/heater is operating)
The indicator is located on top of the crash pad. "

If you also refer to the GV60 owners manual page 290 (convenience features chapter) you will find a minor dissertation on the "Battery Saver Function" as it deals with parking lamps, and headlights, and drivers leaving the vehicle via NOT the driver's door (what?! how the hell?!)... With the 2 other "battery saver" search hits (pages 13 and 290) you are fully-informed, as far as the GV60 manual goes.

But, Hyundai also offers this info about Battery Saver+ in the 2023 Ioniq 6 manual, pg 58 of 582:

"When the function is activating the indicator light illuminates and high voltage electricity
flows into the vehicle. Do not touch the high voltage electric wire (orange), connector,
and all electric components and devices. This may cause electric shock and lead to
injuries. Also, do not modify your vehicle in any way. This may affect your vehicle
performance and lead to an accident."

Unless intentionally disconnected, isn't there always high voltage, actively or potentially, 'flowing' IN the vehicle? Does not high voltage electricity flow INTO the vehicle only when plugged in?

I have not seen, in voluminous postings here, any mention of 12v battery or 12v charging statistics available onboard. Are there any?
How difficult will it be to put a voltmeter display (the data are already there) somewhere in either the instrument cluster, or the main display, as just one of the options, like tire pressure? If I am allowed to see a downward trend in the auxiliary battery voltage, or an increase/lengthening of charging cycles, I can figure it out. Just give me the data...not this most-idiotic-ever idiot-light. Maybe the same car-brain-thing that tells me to "consider taking a break" (Driver attention warning), when driving in a way it isn't satisfied with, could figure out the 12v battery trend and tell me to "consider giving your ICCU a break" because it isn't charging as it should, with a cute little weeping ICCU emoji.

*(WMITW) WORST MANUALS IN THE WORLD

 

[Zcd1]

it isn't charging as it should, with a cute little weeping ICCU emoji.

*(WMITW) WORST MANUALS IN THE WORLD

TL;DR…

I have to say that in the list of things in this world to get worked up about, that yellow light doesn’t even make the top 100,000….IMHO.

 

[GV70Electrified2024]

I thought the amber light was for first responders and mechanics? So they know the high voltage system is active even though the car is “off”. Don’t want to be using the jaws of life on an 800v possibly malfunctioning system.

 

[EVsquatch]

I like the light. It gives me Star Trek Original Series vibes. Whenever I see it on, I realize the car is in "Yellow Alert" and Klingons are likely nearby....

 

[brucek]

I thought the amber light was for first responders and mechanics? So they know the high voltage system is active even though the car is “off”. Don’t want to be using the jaws of life on an 800v possibly malfunctioning system.

Many have said, "Why bother with the lamp and leave it off the car?" I think this is the reason the lamp is there, and if I ever went under the hood, I suppose I would be happy to know this information.

 

[Hanabanana]

To add to the general befuddlement about the orange light on the crash pad, I noticed last night, as the "high voltage indicator" lit up, that so did the fingerprint sensor on the console. Has anybody else seen that happen? Both turned off at the same time. The 12v battery was reported by owners.genesis.com online to be at 90% (still at 90% this morning) at the end of that charging session, with the car not plugged in, and HV at 88% SOC. I did not return to view it after the programmed 20-minute pause in charging, so I don't know if it was satisfied or kept cycling for higher voltage in the 12v.
So, what's the connection there? The car was locked and turned off as much as it could be. Why would the fingerprint sensor activate as the ICCU charges the 12v battery? (the manual has nothing)