Drl - 2018 KTM 790 Duke Forum
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post #1 of 40 (permalink) Old 08-14-2019, 05:51 PM Thread Starter
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Drl

Ok, so I have been trying to see how the DRL works. The manual says (if set to on) it will remain on all the time, except when the low beam is on due to low light conditions. Then it switches off? I can’t seem to be able to see it or how it functions during a ride.

I’d like to keep the DRL on and the headlamp off during the day, and at night or low light, the headlight comes on and the DRL stays on. Does anyone know if this is how it works or can you enlighten me?!!

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post #2 of 40 (permalink) Old 08-14-2019, 06:05 PM
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Never looked into this in detail, really, but as far as I am aware US DOT or FMVSS regulations in the US mandate light on motorcycles, day and night. On my CBR, RC and Kawi I could not turn them off.

Or did I get your question wrong?

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post #3 of 40 (permalink) Old 08-14-2019, 08:00 PM Thread Starter
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No i had one light always on on my old bike as well. I figured that the DRL would suffice for this vs the low beam. I need to have a friend sit on it in 1st gear with the clutch in. I guess if it’s while moving it would be on in this situation?

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post #4 of 40 (permalink) Old 08-14-2019, 08:20 PM
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Will check. Stay tuned...

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post #5 of 40 (permalink) Old 08-16-2019, 12:09 PM Thread Starter
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Still tuned!!

Keep the rubber side down!

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post #6 of 40 (permalink) Old 08-16-2019, 04:10 PM
dma
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I think I know how this works.

If the DRL is enabled in the menu, then DRL LED halo will illuminate when the ambient light sensor detects that there is enough ambient light to not require the dimmed headlight.

If the ambient light sensor thinks it's too dark (think dusk onwards) then the headlight low beam will illuminate instead of the DRL.

If you disable the DRL in the menu, then the headlight low beam will illuminate instead of the DRL all the time, regardless of ambient lighting conditions.

There's a caution in the manual (DRL is on pages 69-70) that if it's foggy that the DRL may not be enough to be seen even though there is still enough ambient light for the sensor not to switch to low beam automatically. In that case it suggests you should disable the DRL in the menu - so you get the low beam instead.

There are cautions about obeying the local regulations too - I've no idea what they are other than in the UK.

Hope this helps!
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post #7 of 40 (permalink) Old 08-16-2019, 06:32 PM
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I have my DRL set to "on" and I noticed that the bottom set of LEDs come on in daylight. When it's dark enough, the regular low beam LEDs switch on and the bottom set turn off.

2019 KTM 790 Duke
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post #8 of 40 (permalink) Old 08-17-2019, 02:38 AM
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you can 'play' with it by covering the light sensor.
it's a small rounded rectangle above the middle of the screen at the top.
In bright daylight you can put your thumb over it and it will think it's night.
remove your thumb and wait about 10 seconds
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post #9 of 40 (permalink) Old 08-18-2019, 12:59 PM Thread Starter
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That makes complete sense DMA. I never thought there was a dimmed low beam automatic mode. I thought just low and high. DJ and Magnets, I will play around with this also and see if I can make out the same as what you guys are saying. Good call!!

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post #10 of 40 (permalink) Old 08-18-2019, 06:49 PM
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I was looking at something at the federal level, but have not been able to find the actual regulation. I did find a lot of state regulations regarding DRL on motorcycles, or the use of light during daytime, which is mandatory.

As far as the manual, here is what is says (in the PDF manual I have it is on page 80):



Reading this is looks like if you choose to turn DRL off, you will have low beam running constantly.

Pretty much was already said in some of the posts above.
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