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2017 Fiat 124 Spider Abarth, fully loaded from the factory, with just a wee bit of aftermarket mods.
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My vehicle has the OEM LED headlights, with auto-leveling and lateral movement with steering. I'm unsure about being able to flick them on when the lights are completely turned off, as it's something I've never tried. I leave them in "auto" mode, so when I start the car, and if it's dark enough, they do a quick little up and down levelling dance ( literally a couple of seconds), and then it's all good. As for the DRL's, it's illegal for cars in Canada to be without them, unless they're old enough that DRL's was not original standard equipment when the car was manufactured. Although I personally won't need to do what you're attempting, I'll be watching the thread as it sounds like an interesting experiment and there are quite a few folks on here who've been trying to figure out how to do a halogen to LED conversion for their spiders.

I "think" (and I stand to be corrected), that if the LED headlight dies, you have to replace the entire headlight assembly, not just replace bulbs as you would with the halogen units. That's why there's only one electrical connection to the LED housing.
 
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2017 Fiat 124 Spider Abarth, fully loaded from the factory, with just a wee bit of aftermarket mods.
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my thoughts exactly. On the other hand, LEDs are almost everlasting, so I don’t worry about that too much.

as for the “initialization dance”, mine don’t do that. Just light up and stay static all the time. Guess that is enabled in some external ECU, linking the headlights adjustments with CAN data from steering wheel angle
Yes, I suspect the auto-levelling dance and the slight sideways movement during steering wheel turns are both tied to an ECU. When I get a moment I'll check the electrical service manual information I have and see if I can find anything that relates to it.
 

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2017 Fiat 124 Spider Abarth, fully loaded from the factory, with just a wee bit of aftermarket mods.
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Need help from LED users — can you pls guys shoot a video/make a series of photos of every front lighting mode on your car?
I want to see what lights and when to check how my headlights should be wired.

this includes:
  • DRL
  • stop lights
  • low beam
  • high beam


I also absolutely love the lit halo look, so I’m wondering if I could map the halo on DRLs mode, but keep the high beam on the DRL segment of the headlight, as it’s supposed to be
I think this covers most of what you're looking for as it both describes the function from inside the car (using the stalk to select the various modes), as well as showing video of the light assembly from the front so you can see what it does. The video does not speak to DRLs, but I believe they are just the mian headlight running at a lower intensity level. Also, the DRL's don't turn on until the car is moving. In Canada, DRL's are mandatory and cannot be turned off, but I "believe" in the US that they can be enabled or disabled by the driver.

Anyway, here's a video that covers it for you (created by MOPAR no less): Headlight Controls
 

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2017 Fiat 124 Spider Abarth, fully loaded from the factory, with just a wee bit of aftermarket mods.
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3,651 Posts
The DRL is the innermost (separate) light outside of the halo, and is never on in the video because the car is not moving, whereas the main beam ("brights" in the video, never heard of that term) is to the side of the dipped LED projector.
Slightly off topic, but brights is a fairly common description in Canada... perhaps in the US as well. We would most often refer to it the "high beams" though. Age old story... two countries separated by a common language. lol
 
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2017 Fiat 124 Spider Abarth, fully loaded from the factory, with just a wee bit of aftermarket mods.
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Indeed, but having spent 2 years living in the US I'm surprised I never heard it before, I guess the Chevy Beretta and other cars I drove at the time never had a problem with their "brights"
But you likely heard reference to "giving someone the high beams" though, right?
 

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2017 Fiat 124 Spider Abarth, fully loaded from the factory, with just a wee bit of aftermarket mods.
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3,651 Posts
I finally got to my electric car shop and they managed to fix everything to operate.
Turned out the wiring was done by some ***-engineering standards, even without using the original harness sockets.
Anyways, updated the first post and added a video in case someone finds that useful.
Congratulations on getting this mostly working for you. One quick question... you mentioned the electrical shop wiring it into the fuse box in the boot? I'm not aware of one in that location. Did you mean under the hood/bonnet?
 
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