Why do LED running lights turn off while the turn signal is blinking? Anyone knows? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 12 Old 10-31-2017, 12:03 AM Thread Starter
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Why do LED running lights turn off while the turn signal is blinking? Anyone knows?

I've noticed in several new vehicles the following scenario:

Vehicle is traveling with LED day-time running lights around/adjacent to the headlights
Vehicle activates turn signal indicator
Vehicle shuts off LED running light while turn signal indicator is flashing
LED running lights turn on once the turn signal indicator stops
Here are the cars I've seen seen this happen:

Jeep Grand Cherokee
Audi Q5
Kia Sportage
Ford Focus
Why don't the LED running lights stay on while the turn signal is on?
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post #2 of 12 Old 10-31-2017, 05:46 AM
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Hey, welcome to JKO.

Great first post. Do you lose sleep over this?

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post #3 of 12 Old 10-31-2017, 06:16 AM
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Itís on some vehicles without LED as well but the main reason is the lights are bright enough that without turning off the light, you might not be able to see the turn signal.
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post #4 of 12 Old 10-31-2017, 06:32 AM
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Thereís some sort of federal rule that dictates they act like this


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post #5 of 12 Old 10-31-2017, 09:13 AM
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The rule has to do with the distance from the turn signal to the LED DRL

I have DRLs in my LED headlights, but the distance from the JK OEM turn signal is far greater than DOT spec, so I don't have them set up to turn off when the turn signal is on.

https://jalopnik.com/heres-why-moder...hen-1792394567

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post #6 of 12 Old 10-31-2017, 01:29 PM
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and the federal laws probably came about for the same reason most stupid laws come to be. People are stupid.

People would probably get confused if the running lights stayed on with the turn signal.

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post #7 of 12 Old 10-31-2017, 03:54 PM
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Because engineers have lost their way and choose form over function.
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post #8 of 12 Old 10-31-2017, 04:43 PM
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Quote:
Originally Posted by mvjeeper View Post
and the federal laws probably came about for the same reason most stupid laws come to be. People are stupid.

People would probably get confused if the running lights stayed on with the turn signal.
Kind of reminds me of the warning on a new iron:
Do not iron clothes while wearing them.

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post #9 of 12 Old 10-31-2017, 05:41 PM
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Quote:
Originally Posted by ronjenx View Post
Kind of reminds me of the warning on a new iron:
Do not iron clothes while wearing them.
"caution" do not hold the chain end of the chainsaw.

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post #10 of 12 Old 10-31-2017, 11:36 PM
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My wife's Cherokee does the same thing.
It makes the turn signal more apparent.

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post #11 of 12 Old 11-01-2017, 06:50 AM
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Quote:
Originally Posted by ronjenx View Post
Kind of reminds me of the warning on a new iron:
Do not iron clothes while wearing them.
the best warning is on womens curling irons "don't insert into body cavities or orifices"
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post #12 of 12 Old 11-01-2017, 07:22 PM
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It is to highlight the turn signals.
The drls are off too when the hazard lights are on for some vehicles.









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