Location of the Light Sensor?
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Super Moderator Alumni
Joined: Oct 2002
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From: So Cal.
2019 GT3 RS, 2017 M3 30 Jahre
Location of the Light Sensor?
Where is the sensor that triggers the automatic headlights? I've been looking for where it is b/c there are really weird times/situations in which the headlights turn on/off and I was just trying to make sense of it. Particularly at dawn/dusk. Thanks!
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Super Moderator Alumni
Joined: Oct 2002
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From: So Cal.
2019 GT3 RS, 2017 M3 30 Jahre
Originally Posted by Phillip711
on the windshield, if you look in the upper middle part, you'll see sensors.
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From: Mililani, Hawaii
2006 Acura RL - Aspec rims/spoiler, JDM grille
I thought it was that black thing on the hood? I also notice my headlights illuminate when the wipers are activated via the rain sensor. I notice the MB sensor is different from the one I had on my 3.5RL. It seems to "look ahead" if that makes sense. It won't illuminate under a bridge where my RL would. I find this feature neat. The RL would always turn on/off especially when going under all the freeway overpasses in traffic. The MB one won't turn on unless everywhere is dark and it even activates much quicker in tunnels... like it fore-see's the darkness ahead. Hope that makes sense. lol
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Thread Starter
Super Moderator Alumni
Joined: Oct 2002
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From: So Cal.
2019 GT3 RS, 2017 M3 30 Jahre
Originally Posted by MB-JIM
It's the small black dot on the rear view mirror. I block mine out with a piece of black tape
Why would you block out the automatic lights function when you can just turn it off and use it manually?
Thread Starter
Super Moderator Alumni
Joined: Oct 2002
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From: So Cal.
2019 GT3 RS, 2017 M3 30 Jahre
Originally Posted by Phillip711
they are light sensor and wiper sensor..
I worked for Mercedes for awhile.. * Training helped * =P
I worked for Mercedes for awhile.. * Training helped * =P
what's the little black circular thing on the middle of the hood? I always thought that it was some sort of senor.
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Joined: Nov 2001
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From: Ashburn, VA
'19 GLC 300, '19 TM3SR+
Originally Posted by nlpamg
Where is the sensor that triggers the automatic headlights? I've been looking for where it is b/c there are really weird times/situations in which the headlights turn on/off and I was just trying to make sense of it. Particularly at dawn/dusk. Thanks!
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Joined: Dec 2002
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From: Singapore
C180K
Originally Posted by vadim
On pre-2004 W/CL203 there were 3 light sensors: rain sensor (top of the windshield), then road-ahead light sensor (front side of the rear view mirror, faces forward) and ambient light sensor (imbedded in the mirror, faces rearwards). This has since been simplified by MB, and all news models have a combined rain and light sensor mounted at the top of the windshield.
There is an orange coloured LED below the rear view mirror... Anyone knows what this is for?
Also, anyone knows how the rain sensors work (What do they sense? Moisture?)? It can't be because its behind the windscreen... Its also "intelligent" enough to know when the rain is heavy or light...
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From: Montreal, Quebec
2001 C240 Tectite
Originally Posted by dgwee
I have the 2005 and the "road-ahead" sensor (front side of the rear view mirror) is still there. Unless this senses something else in the 2005...
There is an orange coloured LED below the rear view mirror... Anyone knows what this is for?
Also, anyone knows how the rain sensors work (What do they sense? Moisture?)? It can't be because its behind the windscreen... Its also "intelligent" enough to know when the rain is heavy or light...
There is an orange coloured LED below the rear view mirror... Anyone knows what this is for?
Also, anyone knows how the rain sensors work (What do they sense? Moisture?)? It can't be because its behind the windscreen... Its also "intelligent" enough to know when the rain is heavy or light...
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From: Houston, TX
2015 E250D
The sensors actually sense water droplets and NOT moisture. There is a mirror with lens that is used and I believe it senses the difference is refraction of light. When water passes over it, light refracts differently. The LED that is Always ON is the new ambient light that illuminates the center console area. The led for the garage door opener is different. THe Ambient Light is a 2005 added feature. Do a search. Mirrors run around 700 bucks new before anyone asks if it can be retroftted.
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From: Manchester, TN
2004 C320 pewter/charcoal
Does anyone know if you can adjust the sensitivity for the auto light function? I leave my lights on the auto function always. In the morning, even if it is bright out, it seems to turn on the headlights. It turns on appropriately when I drive home in the evening, but I think it's a bit sensitive for the morning (dawn light).
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From: Singapore
C180K
Originally Posted by jugdishoh1
Does anyone know if you can adjust the sensitivity for the auto light function? I leave my lights on the auto function always. In the morning, even if it is bright out, it seems to turn on the headlights. It turns on appropriately when I drive home in the evening, but I think it's a bit sensitive for the morning (dawn light).
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From: Singapore
C180K
Originally Posted by vadim
On pre-2004 W/CL203 there were 3 light sensors: rain sensor (top of the windshield), then road-ahead light sensor (front side of the rear view mirror, faces forward) and ambient light sensor (imbedded in the mirror, faces rearwards). This has since been simplified by MB, and all news models have a combined rain and light sensor mounted at the top of the windshield.
If the light level at the front of the car (try covering the sensor with a card) is lower than the rear of the car, the mirror dims.
