medsox
Junior Member
2019 GTI MK7FL Autobahn DSG 2.0L USA
Posts: 58
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Post by medsox on Sept 6, 2022 16:12:22 GMT
I have a 2019 GTI MK 7.5 and often when I am driving in sunny weather if I drive into some shady areas the automatic headlights turn on. I found these settings in OBD11. Does anyone have advise on which of the settings I should change and what they recommend the settings to be so the lights don’t turn on in conditions that headlights aren’t really needed?
Einschaltgrenze CHO LHO 600 Ix
Daemmerungsgrenze, Hysterese obergrenze 1200 Ix
Daemmerungsgrenze Hysterese untergrenze 2200 Ix
Helligkeitsgrenze sehr hell 2000 Ix
Helligkeitsgrenze Licht Einschalten 1200 Ix
Helligkeitsgrenze Licht Ausschalten 2200 Ix
There are some other settings under “Light Sensor” that I didn’t list that I’m not sure if they should be change also.
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Post by baarecz on Sept 7, 2022 12:12:05 GMT
First try setting the automatic headlights to "Late activation" in the lights category of the settings menu. That should make the lights not turn on just by passing through a longer shadow. The light sensor settings should be changed as well I'd say. I personally wouldn't mess with any of that. I just turn the light switch from Auto to Off so only the DRLs stay on during the day. But read through this thread, maybe it'll help. forum.obdeleven.com/thread/2842/change-light-sensor-sensitivityAlso try to google it. And if you decide to fiddle with it, just make sure to make a backup before. |
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medsox
Junior Member
2019 GTI MK7FL Autobahn DSG 2.0L USA
Posts: 58
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Post by medsox on Sept 7, 2022 14:47:51 GMT
Thanks. The car is already set to "late activation". That didn't help at all. I did read the thread you posted prior to my post. I did help me find the settings in obd11 to change I just don't know what to change them to. Not much help on Google. I was looking for some guidance as to what the settings I posted do. Are they the correct settings to test with or am I looking in the wrong area.
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Post by dv52 (Australia) on Sept 8, 2022 1:02:42 GMT
I don't have a definitive answer to your question -but I can shed light (pun intended) on the design principle that appears to be used in these channel. It seems that "Daemmerungsgrenze" (twilight limit) and "Helligkeitsgrenze" (brightness limit) rely on Hysteresis which is an engineering principle that applies two different threshold values.
The problem with using just one threshold for these functions is that as the car drives through ambient light levels close to this limit, the sensor will continuously switch OFF/ON. This is called "hunting" and the problem is solved by using 2 x threshold limits.
So, with hysteresis- as ambient light levels slowly fall at dusk, the function will switch-on at the lower limit (i.e. 1200 lux). However, once switched-ON, the function will not switch-OFF until the ambient light level rises again (at dawn) to the upper limit (i.e. 2200 lux). In effect, the light levels between the upper and lower limits create what's known as a "dead-band" in which the function remains switched-ON. Hope this makes sense.
What I think this means is that you should retain the factory differential between the upper and lower limits (i.e. 1000 lux) if you change either value in the hysteresis.
As another suggestion (this is a guess), there is another channel on some central electrics modules with the name Tunnel_einschalt_verzoegerung- which translates to "Tunnel_switch-on_delay". The default value of this channel is 2. I have no idea what "2" means (perhaps it's 2 seconds?), but I suspect that it's a time-scale that allows the AFS to not operate when the car is in a tunnel. Maybe increasing this number might have the effect that you seek (again - I'm guessing, of course)
Don
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medsox
Junior Member
2019 GTI MK7FL Autobahn DSG 2.0L USA
Posts: 58
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Post by medsox on Sept 8, 2022 12:17:52 GMT
Thanks Don. The pun was perfect. You definitely helped me understand how this works. I will make some adjustments and see what works. If I do get something to work I will post it. I think the tunnel delay might be where I start. There aren't any tunnels where I live and drive.
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Post by kewlansz on Sept 5, 2023 17:51:01 GMT
Were you able to test the hypothesis? I tried with low values of 100 , 200 & 300 for threshold, low limit, high limit respectively when the light sensor reading was 570 lux( it was dusk). However, the prompt- please switch on dipped beam kept popping up in the car. I wonder if I need to reset the light settings as required for komfort blinken setting. There was an additional setting of infrared with value 00 50. But the realtime value was being shown as 400 lux for infrared. I can't make out if this sensor is also responsible for signalling the car about day and night.
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Post by dv52 (Australia) on Sept 5, 2023 22:26:03 GMT
kewlansz : Not sure if it helps, but there's dialogue about this topic HERE
Don
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