Rear Fog Light
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Joined: Jun 2016
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From: Grand Rapids, MI
GenesisG70 '20 GLC300 DakotaBrwn/Silk '16
Rear Fog Light
I have a U.S. spec GLC. I noticed the "Fog Light" button just to the left of the exterior lights dial. At first I thought it was a dead button, but found out that pressing it will activate some LED's on the driver's side taillight. I've not seen this type of feature on my vehicles or frankly, in use on any vehicle while driving.
Is this appropriate to use in the states? Again, it lights up only the drivers said rear taillight a bit more. I have yet to check if it's the same lights that one using with the turn signal, but it's back there anyway. Seams like it would clearly help with visibility, though I found it a bit odd that it only does the one side.
Thoughts?
Is this appropriate to use in the states? Again, it lights up only the drivers said rear taillight a bit more. I have yet to check if it's the same lights that one using with the turn signal, but it's back there anyway. Seams like it would clearly help with visibility, though I found it a bit odd that it only does the one side.
Thoughts?
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From: Springboro, OH
16 GLC 19 Volvo XC40 06Corvette Z06
This light is there in order to comply with EU regulation. Very common in Europe and around the world.
Not common in the US as there is no mandate requiring it. Have never seen this feature on a North American built automobile.
This high intensity light is meant to be illuminated during periods of inclement weather such as fog, smoke or heavy precipitation thereby preventing a rear end collision by a following vehicle.
It should not be used during normal visibility conditions as its brightness can dazzle following drivers.
Some US drivers misuse the light, I think, because they don't know what its real purpose is and its deleterious effect on following drivers when visibility is good.
Not common in the US as there is no mandate requiring it. Have never seen this feature on a North American built automobile.
This high intensity light is meant to be illuminated during periods of inclement weather such as fog, smoke or heavy precipitation thereby preventing a rear end collision by a following vehicle.
It should not be used during normal visibility conditions as its brightness can dazzle following drivers.
Some US drivers misuse the light, I think, because they don't know what its real purpose is and its deleterious effect on following drivers when visibility is good.
Last edited by larrypmyers; Jul 11, 2016 at 09:52 PM.
Super Member
Joined: Dec 2015
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From: Springboro, OH
16 GLC 19 Volvo XC40 06Corvette Z06
Years ago the rear fog light feature included a high intensity light in both tail lights. My wife had an 84 Volvo with this system. Am guessing it's now but one light so as to preclude drivers steering into the rear of a stopped vehicle with its rear fog lights illuminated. Perhaps our EU or Aussie friends can clarify.
Thread Starter
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Joined: Jun 2016
Posts: 130
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From: Grand Rapids, MI
GenesisG70 '20 GLC300 DakotaBrwn/Silk '16
This light is there in order to comply with EU regulation. Very common in Europe and around the world.
Not common in the US as there is no mandate requiring it. Have never seen this feature on a North American built automobile.
This high intensity light is meant to be illuminated during periods of inclement weather such as fog, smoke or heavy precipitation thereby preventing a rear end collision by a following vehicle.
It should not be used during normal visibility conditions as its brightness can dazzle following drivers.
Some US drivers misuse the light, I think, because they don't know what its real purpose it and its deleterious effect on following drivers when visibility is good.
Not common in the US as there is no mandate requiring it. Have never seen this feature on a North American built automobile.
This high intensity light is meant to be illuminated during periods of inclement weather such as fog, smoke or heavy precipitation thereby preventing a rear end collision by a following vehicle.
It should not be used during normal visibility conditions as its brightness can dazzle following drivers.
Some US drivers misuse the light, I think, because they don't know what its real purpose it and its deleterious effect on following drivers when visibility is good.
I'm still surprised to see this on a US spec MB.
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Joined: Oct 2013
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'16 GLC300
I use the rear fog light when it is very dark or with low visibility situations. It is about as bright as flashing the brake lights.
Many of my previous benz all had this feature. Heck, even my 98 ML320 has it.
Many of my previous benz all had this feature. Heck, even my 98 ML320 has it.
Thread Starter
Member
Joined: Jun 2016
Posts: 130
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From: Grand Rapids, MI
GenesisG70 '20 GLC300 DakotaBrwn/Silk '16
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Joined: Dec 2015
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From: Springboro, OH
16 GLC 19 Volvo XC40 06Corvette Z06
I figured as much, but honestly, it didn't look that bright. It's not like a white light shining, but I suspect it could distract some. It's not like a front end fog light. I'll try to check next time my wife and I drive at night to see exactly what light goes on, but my gut is telling me it's the same as the turn signal, but it goes solid, not flashes. I may be wrong but will check. Thanks for the background too.
I'm still surprised to see this on a US spec MB.
I'm still surprised to see this on a US spec MB.
So I went to the garage to get educated.
The light is mounted on the same plane as the backup lights at the very inboard of the tail light assembly. It consists of three leds' and to say they are very bright is an understatement. The further away from the vehicle you are the brighter they become. I was about 20 feet away and they were blinding. Trust me if this light is turned on when visibility is normal the guy behind you is going to be very pissed off. Much brighter, very much brighter than any other light on the rear of the vehicle. (see post 8)
When illuminated it is, of course, a very bright red. A closer look reveals the leds' are mounted at the very top of the assembly focused downward. The beam is turned from vertical to horizontal by a series of reflectors, much like the Corvette C7 taillights. An innovative design.
Last edited by larrypmyers; Jul 11, 2016 at 09:54 PM.
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Super Member
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From: Springboro, OH
16 GLC 19 Volvo XC40 06Corvette Z06
Correction: The seven led turn signal and the three led rear fog lamp are very similar in brightness. However, the fog lamp has a different focus that gets your attention. The turn signal lamp does not dazzle as the fog lamp does.
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From: Cincinnati OH
2013 BMW X6 - Soon to be GLC300 4M
Fog lights in the front don't do much but reflect the light back at you (assuming you are using them in actual fog). In the rear, it makes you more visible to vehicles behind you for what that's worth.
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From: Melbourne, Australia
2016 GLC 250d AMG pack, 2017 GLC Coupe 250d AMG pack , 2002 BMW 330Ci convertible, 2021 BMX X1 sD20i
Here in Oz, rear fog lights are common, yes part of EU safety. Virtually all imported cars into Oz have them, even from Asia / Japan. Older models have two, most now just one. Agree very bright, some idiots here drive without even knowing they have turned them on, extremely annoying if following at dusk and night, quite blinding. It's illegal to use them unless conditions warrant, like severely reduced visibility, fog naturally or torrential rain, etc.
Can be useful if car behind has forgotten to turn on their lights at night or tail gate your rear end - they soon get the message, well most do, some who we jokingly categorise as Darwin Award types who will never get the hint !!!
Can be useful if car behind has forgotten to turn on their lights at night or tail gate your rear end - they soon get the message, well most do, some who we jokingly categorise as Darwin Award types who will never get the hint !!!
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2016 GLC 250d AMG pack, 2017 GLC Coupe 250d AMG pack , 2002 BMW 330Ci convertible, 2021 BMX X1 sD20i
Here is another thread in this forum re fog lights.
https://mbworld.org/forums/glc-class...og-lights.html
https://mbworld.org/forums/glc-class...og-lights.html
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Joined: Jun 2016
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From: Grand Rapids, MI
GenesisG70 '20 GLC300 DakotaBrwn/Silk '16
Here is another thread in this forum re fog lights.
https://mbworld.org/forums/glc-class...og-lights.html
https://mbworld.org/forums/glc-class...og-lights.html
Thread Starter
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Joined: Jun 2016
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From: Grand Rapids, MI
GenesisG70 '20 GLC300 DakotaBrwn/Silk '16
Here I thought it was a dead switch since I didn't have fogs up front.
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From: Ireland
GLC 300d 4matic
Using the fog light when it "..is very dark" is not what it is designed for and is insensitive to following motorists, dangerous, illegal (in Europe anyway) and downright STUPID.
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From: Ireland
GLC 300d 4matic
If you have ILED headlights up front then you do effectively have fog lights .
When the rear fog light switch is activated, in conditions such as fog, falling snow, the shape of the headlight beam is altered to reduce reflection/glare.
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From: Grand Rapids, MI
GenesisG70 '20 GLC300 DakotaBrwn/Silk '16
Well, I guess I don't have ILED headlights (?) They move some... leveling, but no change if fog light button is depressed.
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From: Ireland
GLC 300d 4matic
