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Discussion Starter · #1 ·
Hi, I need some advice on a problem. when I have the light settings to auto the drls turn on by itself when the car is parked, and i was afraid the drain would be bad for the battery. I have brought this to my local dealers attention, but after they ran test the lights were found to be OK? So what do I do now? Any help for thiss matter will be appreciated!
 

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Discussion Starter · #3 ·
Yeah, its very random, only happens when parked and off, and I cant blame the dealer for having a problem diagnosing the problem, it only happens once a week :shrug:
 

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Crazy shop manual circuit shows the DRL's in parallel with the low beams, we know this is not correct as the DRL's can come on independent of the low beams. Headlight circuit appears to be all solid state, headlight switch at the end of the directional signal lever fires different voltages to the so-called smart junction box. Shown as a box with inputs and outputs, what's in the box.


Controlled by the BCM that depends upon a good power on reset when the button is first pushed, has to reset the program counter to zero so it starts reading code from the beginning, if not, no telling what you will get.


Putting a scope across the battery when hitting the starter, should show a voltage of no lower than 8.5 volts, if lower, either battery or connective type problems will not get a proper POR as its called, and for the more part erratic.


I feel this is your problem, been this was ever since our vehicles are computer controlled, even way back in the early 80's. Also, no trouble codes for this as the same computer that does the controlling also troubleshoots itself. How can it troubleshoot itself if its not reading code properly?
 

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I have a 2016 Elantra that is doing this now.

I found my car totally dead one morning recently, and had all sorts of possessed things happen as I was charging the battery with jumper cables.

Happened again, and the battery wouldn't charge back up after that. (Still didn't know what caused it)

So, I bought a brand new battery.
Well, I was able to tell now, because the battery was good enough that when I came out in the morning I saw my DRL on. Grrr.
Drove to work, turned off the motor, lights in auto. Watched and verified headlamps, and DRL went out.

Came back out after work, and the DRL was ON again. With a new battery.
Turned over well as if it was still fully charged.

So, twice now after putting in a new battery.
I'm at a loss.
 

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I have a 2016 Elantra that is doing this now.

I found my car totally dead one morning recently, and had all sorts of possessed things happen as I was charging the battery with jumper cables.

Happened again, and the battery wouldn't charge back up after that. (Still didn't know what caused it)

So, I bought a brand new battery.
Well, I was able to tell now, because the battery was good enough that when I came out in the morning I saw my DRL on. Grrr.
Drove to work, turned off the motor, lights in auto. Watched and verified headlamps, and DRL went out.

Came back out after work, and the DRL was ON again. With a new battery.
Turned over well as if it was still fully charged.

So, twice now after putting in a new battery.
I'm at a loss.

What happens when you switch your headlamp switch to off, does this problem still occur? My computer goes crazy at times and will switch itself off, has 8 GB of RAM, pull all the memory and use #2 pencil eraser to clean the contacts, then its good for while. Could be one marginal contact to your BCM. Problem with controls like this, but never happened with a good old fashion on-off switch. But people forget to switch it off and end up with a dead battery.

Other problems can be with your battery itself, terminals must be clean, and have to check both 12V and ground connections.

On some vehicle alternator ground has problems, corroded aluminum, solve this by adding a 10 AWG wire ground to the case of the alternator to a good engine ground with silicone and external tooth lock washers.

Using a voltmeter checking for voltage drops helps to find these problems.
 

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Hi, I need some advice on a problem. when I have the light settings to auto the drls turn on by itself when the car is parked, and i was afraid the drain would be bad for the battery. I have brought this to my local dealers attention, but after they ran test the lights were found to be OK? So what do I do now? Any help for thiss matter will be appreciated!
Since it is happening to you intermittently and the dealer hasn't "seen" it I'd suggest when it does happen to record it. Have your recording show the lights on, get close and show the engine is not on, film where the indicator is on Auto, the whole incident. Then when you do go to the dealer you have something they can see. Usually it will prompt a dealer to take the car in for some time until it happens "for" them so they can diagnose it rather than just giving you a "could not duplicate concern". The other thing would be to make sure you keep having it listed as a line item concern at every opportunity. It will document your concern in case you need it in the future, if the battery fails etc.

Good luck and let us know what happens
 

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Hi, I need some advice on a problem. when I have the light settings to auto the drls turn on by itself when the car is parked, and i was afraid the drain would be bad for the battery. I have brought this to my local dealers attention, but after they ran test the lights were found to be OK? So what do I do now? Any help for thiss matter will be appreciated!
Did you ever find a resolution to this?

Random question but do you have a sprint drive on this car?
 

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I've had the same exact issue with my 2017 Elantra SE. My local dealer looked at it afew times and never could duplicate it so I'm not sure what causes it or how to fix it other than not using the auto light settings
 

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Here is a circuit if that directional lever mounted headlamp switch.

449541


Don't pay attention to that double head lamp dimmer switch, the three switches to the right of that. Switch actually has four positions but in off all three switches to the right are in the off position. Kid that drew this doesn't know the proper schematic drawing of a switch, showing contact in both the on and off positions.

Also note this switch works with the ignition off. In auto position a 6800 ohm resistor is grounded, in tail a 1,000 ohm resistor is added for 7,800 ohms in head, a 3900 ohm is added for 11,700 ohms, this enters different voltages in to the microcontroller circuit to provide for four different functions, do this to save wire.

The if for any reason this switch get wet, rain or swear, that will change the resistance of the switch and may turn things on, another problem is dirty switch contacts adding to the resistance that will switch on lights. Typically a rotary switch like this has self wiping contacts so working the switch up and down will clean them, perhaps solving your problem. Another solution for an erratic switch is to replace it.

Erratic problems are not easy to solve in electronics.
 

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Anybody have an update to this issue? Has Hyundai acknowledged this issue with anyone? My 2017 Elantra SE just started doing this. Twice in a month, the auto setting turns my lights on randomly in the middle of the night and I wake up to a dead battery. Dealership doesn't know and can't do anything they said.
 

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id like to know too because this literally just happened to my 2017 Elantra Sport 10mins ago. Looked outside and my lights were on. Turned the DRL off and they went out. Keeping em off as I dont want a dead battery but will def bring it up when I go to Hyundai in a couple weeks. Thought I was seeing things OR catching someone stealing it
 

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I can emulate this problem by rotating the directional signal headlamp switch one position up from Auto has the symbol for those daylight running lights. In this position the DRL's are on and with the doors closed and the ignition off.

This is a rotary switch and in general have self cleaning contacts. If the switch is left in the AUTO position and that contact is a bit dirty will added extra resistance to emulate the DRL position.

I have a digital camera with a rotary switch. for 8 different functions and will not be in the function I have selected. So I have to rotate that switch several times where that wiping action cleans the contacts, then its correct on the position I left it in. Been cleaning rotary switches for years, this camera won't let me do that, in a stamped and sealed cover.

Am assuming the light selector switch in our Elantras is the same way, stuck in the Auto position, a little corrosion on the contacts can add some resistance to the total circuit and fool the BCM. One cure is to work this switch back and forth, sure doesn't look repairable. Fooling the AUTO position into thinking its in the DRL position.

If working the switch does not work, another solution is to switch the switch to the OFF position. Or see if you dealer will replace the switch. Been switching off light switches for over 65 years.


Reminds me of my camera, this switch doesn't look repairable.
 

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id like to know too because this literally just happened to my 2017 Elantra Sport 10mins ago. Looked outside and my lights were on. Turned the DRL off and they went out. Keeping em off as I dont want a dead battery but will def bring it up when I go to Hyundai in a couple weeks. Thought I was seeing things OR catching someone stealing it
Same I have a sport as well.
 

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I have the same issue with a 2014 Elantra LTD. I’ve seen it several times so I can only wonder how many times it happened that we didn’t witness. now battery issues make a little more sense.
 

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I have the same issue with a 2014 Elantra LTD. I’ve seen it several times so I can only wonder how many times it happened that we didn’t witness. now battery issues make a little more sense.
having the same issue that just started this week in a 2018 Elantra SEL. Anyone know what’s going on this is crazy it’s happened 2 times now and don’t want my battery to just die on me. Car barely has 38k miles
 

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Four position light switch is left in off? Slightly dirty contact in Auto will switch the DRL's on. Another problem, the BCM's could need to be reflashed.

Practically all new vehicles are using point contact relays for headlights. Just one tiny arc on these contacts will prevent a headlamp from illuminating, swear these kid engineers are smoking crack.

The days of using 14AWG wire minimum for all wiring is history, reason was, its far more robust and each strand was plated. Today find 30AWG wire bare copper, copper oxide is a darn good insulator. And the ECU with a delicate microcontroller was moved outside of the vehicle into the engine compartment to save on wire. But that underhood has an extreme temperature change.

Also have a signal literally passing through millions of micron sized FET's to fire an injector or a spark plug. One reason, even as a highly skilled engineer, besides the car warranty, carry towing insurance. Even for a flat tire, not safe to replace it on the road with the idiot drivers today. Use to stop and help people, today, try to run them over.

More than likely your directional signal lever with all those switches has to be replaced, tell you dealer, Nick told you so.
 

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Four position light switch is left in off? Slightly dirty contact in Auto will switch the DRL's on. Another problem, the BCM's could need to be reflashed.

Practically all new vehicles are using point contact relays for headlights. Just one tiny arc on these contacts will prevent a headlamp from illuminating, swear these kid engineers are smoking crack.

The days of using 14AWG wire minimum for all wiring is history, reason was, its far more robust and each strand was plated. Today find 30AWG wire bare copper, copper oxide is a darn good insulator. And the ECU with a delicate microcontroller was moved outside of the vehicle into the engine compartment to save on wire. But that underhood has an extreme temperature change.

Also have a signal literally passing through millions of micron sized FET's to fire an injector or a spark plug. One reason, even as a highly skilled engineer, besides the car warranty, carry towing insurance. Even for a flat tire, not safe to replace it on the road with the idiot drivers today. Use to stop and help people, today, try to run them over.

More than likely your directional signal lever with all those switches has to be replaced, tell you dealer, Nick told you so.
Thanks for the awesome response! I’ve been leaving it on off after the lights turned on by themselves the 2nd time. I thought it was just user error the first time but the 2nd time I knew for sure and then came across it being a problem others have experienced online so left the switch on off to be safe and see if they still came on but so far no issues with switch on off. Thanks for all the insight as a fellow engineer it makes a lot of sense and great to know that but also unfortunate that this is what they’ve begun doing in cars. I will definitely take the car in and see if they’re willing to do either option of replacing the switch or reflashing BCM’s. I’m sure if I mention your name I should have no problem though! Lol 😂
 

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First vehicle ever with the only way to switch on the headlights with the engine running. What happens if the engine dies on the road, and you need some light to push it off to a safe place?

Do carry a couple of flashlights. Was thought as a young engineer to think worse case but do not feel thinking is important anymore.

But at least don't have to be concerned about leaving your headlamps on in a parking lot.
 
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