DRL - which are they? - Fiat 124 Spider Forum
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post #1 of 13 (permalink) Old 04-07-2019, 03:39 PM Thread Starter
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DRL - which are they?

I'm trying to work out which lights are the Daytime Running Lights on cars with the standard halogen set-up. As far as I can tell, I don't have anything lighting up, however, as I understand it, the DRL's are only active when the cars moving. I left early this morning for a drive - before dawn - and my experiments with the light switches in various positions would suggest I didn't have any DRL's. I checked in the car settings and DRL is enabled.

So, with the lights being operated manually, I have the following:

Side Lights:



Main Beam:



Full / High Beam:



So which should be illuminated for the DRL's? If it's just the side lights, that would make sense because the amount of light being output by them is pretty meager. But if it's either the main beams or full beams, it would seem I have a problem somewhere.
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Last edited by 68wooley; 04-07-2019 at 03:41 PM.
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post #2 of 13 (permalink) Old 04-07-2019, 03:48 PM
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They come on in gear with the parking brake off. I can see them on in the reflection of a car in front of me, even at a stop light. I think they come out of the high beam reflector, but dimmer than the high beam.

Yes, the high beam doubles as the DRLs:

https://21stcenturyfiat124spider.wor...m/specs/#bulbs

I always have my headlights switched to “auto”, maybe that’s a requirement for the DRLs to come on. Obviously they have to be enabled in the settings, too.

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Last edited by sharkcohen; 04-07-2019 at 03:55 PM.
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post #3 of 13 (permalink) Old 04-07-2019, 04:11 PM Thread Starter
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Quote:
Originally Posted by sharkcohen View Post
They come on in gear with the parking brake off. I can see them on in the reflection of a car in front of me, even at a stop light. I think they come out of the high beam reflector, but dimmer than the high beam.

Yes, the high beam doubles as the DRLs:

https://21stcenturyfiat124spider.wor...m/specs/#bulbs

I always have my headlights switched to “auto”, maybe that’s a requirement for the DRLs to come on. Obviously they have to be enabled in the settings, too.
Hmm - wonder if they run lower power for the DLRs if they are using the full beams. Or if the 'auto' light sensor switches them off after dark (to prevent you running round with your full beams on by accident). Need to do some more experimentation.

Of course, the led bulbs I stuck in there yesterday could also be the issue....
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post #4 of 13 (permalink) Old 04-07-2019, 05:30 PM
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Yes, in the standard halogen lighting configuration, the same bulb fulfills the mission of both high beam and daytime running lights.
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post #5 of 13 (permalink) Old 04-07-2019, 05:47 PM Thread Starter
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Quote:
Originally Posted by CDPond View Post
Yes, in the standard halogen lighting configuration, the same bulb fulfills the mission of both high beam and daytime running lights.
Yeah - don’t think LEDs are going to work in there. Oh well.
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post #6 of 13 (permalink) Old 04-07-2019, 05:56 PM
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DLR's ... the 124 is the only car I know of that has tail and registration lights on with the DRL's !
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post #7 of 13 (permalink) Old 04-07-2019, 07:24 PM
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(and they go off when you come to a stop and pull up the handbrake, and go an again once you start moving)

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post #8 of 13 (permalink) Old 04-07-2019, 08:11 PM
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the drl on my toyota singed the plastic lens, probably while the vehicle was stationary, so perhaps that's what mazda had in mind.
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post #9 of 13 (permalink) Old 04-08-2019, 12:43 AM
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Most setups that i have seen that use the high beams as the DRL's run the bulbs at a lower voltage so they don't contribute to an early burnout of the high beams. In fact a number of manufactures actually run the two high beam bulbs in series when being used as DRL's thereby only sending 6 volts to each bulb. A normal halogen filament bulb will work with this setup. An LED bulb would probably not work.
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post #10 of 13 (permalink) Old 04-08-2019, 10:51 AM Thread Starter
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I ordered set of Philips X-Treme Vision halogens for the full beams / DRLs - think that's as good as its going to get unless you are happy to live without DRLs (which you might be).

Not a big deal - the LEDs for the dipped beams, fogs and side lights all look pretty good. Wonder if I'll be able to get the double sided tape off the LED control unit enough to be able to return them. $80 mistake if I can't :-/

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