Weird Hyperblink Issue

[dmitriylm]

I started noticing a few days ago that when leaving the house for work in the morning my turn signals would hyper blink for the first few turn signal applications. I believe its happening with both sides and none of the bulbs are out. The typical behavior is that I'll put on my turn signal for the first time that morning, notice the hyper blink but by the time I turn the other signal on for the next turn the issue goes away. This morning I pulled over and stepped out of the car as it was happening and sure enough the right side was blinking rapidly as if the bulb was out. Then I switched the indicator to the left side and it was blinking fine, switched back to the right side and it too was blinking fine. I believe on a prior day I noticed it happening with the left side first. Hopefully some experts can chime in!

 

[OneFunGenesis]

sub'd as this is an interesting electrical issue

 

[Bill K]

If it's still under warranty, let the dealer worry about it.

 

[TheDr9669]

I had just experienced hyper blinking with my ride. I noticed it right after changing out my H8 fog lights with some LED bulbs. It started driving me crazy because it would mostly hyper blink, but not 100%. I narrowed it down to when I had the H8 LED's on, I would get hyper flash. Turn the fogs off, no hyper flash. And, only while driving. If the car was motionless, no hyper flash. I replaced the LED's with regular halogen bulbs, tada! No more hyper flash at all.
I discussed this with my brother and went thru the Hyundai tech site, and the only thing we can think of that would cause it is the front control module looking for a specific resistance load and signalling a hyper flash condition. But even this didn't hold water because the reason I replaced the fog light bulbs is because one of them was out, and I never had hyper flash. I personally believe it to be the work of some sort of aliens...

 

[geops]

This goes for all bulbs ... the load should match or weird stuff might start happening. Also, warning lights on the dash might start showing up. If the original bulb was 15W for example, you need to replace it with a 15W LED(it can be achieved with adding some extra resistance).

 

[dmitriylm]

I had just experienced hyper blinking with my ride. I noticed it right after changing out my H8 fog lights with some LED bulbs. It started driving me crazy because it would mostly hyper blink, but not 100%. I narrowed it down to when I had the H8 LED's on, I would get hyper flash. Turn the fogs off, no hyper flash. And, only while driving. If the car was motionless, no hyper flash. I replaced the LED's with regular halogen bulbs, tada! No more hyper flash at all.
I discussed this with my brother and went thru the Hyundai tech site, and the only thing we can think of that would cause it is the front control module looking for a specific resistance load and signalling a hyper flash condition. But even this didn't hold water because the reason I replaced the fog light bulbs is because one of them was out, and I never had hyper flash. I personally believe it to be the work of some sort of aliens...

Interesting that you say that as I installed LED fogs a few months back. But I don't think the issue started at the same time (still on going by the way). I also replaced the bulbs because one of them was out. It's only a problem for the first few applications of the turn signal (sometimes working fine for the first one). When I leave the house in the morning I make 3-4 turns on smaller streets before turning onto the main street and by the time I'm on the main street the blinkers work normally. I was planning on replacing the BCM as it can be bought for $150 or so on eBay but I might have to swap the fogs first.

 

[TheDr9669]

Interesting that you say that as I installed LED fogs a few months back. But I don't think the issue started at the same time (still on going by the way). I also replaced the bulbs because one of them was out. It's only a problem for the first few applications of the turn signal (sometimes working fine for the first one). When I leave the house in the morning I make 3-4 turns on smaller streets before turning onto the main street and by the time I'm on the main street the blinkers work normally. I was planning on replacing the BCM as it can be bought for $150 or so on eBay but I might have to swap the fogs first.

You should be able to check by just turning off the fog lights. That is how I was able to figure mine out. Otherwise it would have gone into the dealership for warranty work.

 

[homeofstone]

The previous post re: LED bulbs is correct. hyper blink is a lack of resistance. Bulb is burned out or in case of LED it needs to be a canbus with resistance.

 

[PauleyDucati]

I have been having the same issue. The weird part is I replaced my fog bulbs with yellow CANBUS LEDs almost a year ago and it never happened until a week or so ago. It started doing it as you mentioned, just for few minutes of driving and now it does it 99% of the time I use the signals no matter how long car has been sitting or running. None of the bulbs are out and the hazards still flash as slow as they should, only the signals are affected.

I replaced the turn signal multifunction switch just for fun as I have had issues with that in the past causing my headlights to flash when engaging the signal. Replacing the switch DID NOT solve this issue. If it is bring caused by the LED fog bulbs, why would that affect the turn signal flash frequency and I cannot understand why it would take almost a year for the problem to show itself... Unless the bulbs are deteriorating due to the heat etc. High powered LEDs do produce a lot of heat, maybe the circuitry is failing within the bulbs after that length of time. I supose I could try a new set of bulbs. These cars are very pleasant and easy to work on but they do have some super weird electrical inconveniences that occasionally pop up.

 

[Mr Grza]

Sounds like the load resistor of the LED bulbs is failing. The load resistor is used to emulate the load the ecu expects to see. A lower load results in either the ecu thinking the bulb is out or failing. The hyperblinking is normally attributed to the ECU switching it on and off attempting to regulate the current.

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