GLS Class (X166) Produced from 2016 to 2019

high beam lights

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Old Mar 25, 2021 | 09:21 AM
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ML350 GLS450
high beam lights

Just bought 2018 GLS450 . With the lights on AUTO ,when I push the stick forward the high beam lights don't work, they do when pushing inwards. If lights are on manual then it works fine. All my previous Mercedes didn't have this issue. Operator error?
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Old Mar 25, 2021 | 09:56 AM
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GLC 300d 4matic
Originally Posted by oscarin
Just bought 2018 GLS450 . With the lights on AUTO ,when I push the stick forward the high beam lights don't work, they do when pushing inwards. If lights are on manual then it works fine. All my previous Mercedes didn't have this issue. Operator error?
Does the letter 'A' appear beside the headlight symbol on the dash when the stalk is pushed forward?
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Old Mar 25, 2021 | 10:31 AM
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ML350 GLS450
Yes, there is letter A
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Old Mar 25, 2021 | 11:55 AM
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When you push the arm forward and the A comes on that means the high beams should come on ONLY when oncoming headlights are not detected.
I have the upgraded headlight package and that is how it works for me.
Mike
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Old Mar 25, 2021 | 12:12 PM
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ML350 GLS450
I was in the NC mountains last week and the roads to my house were pitch dark and I wanted to see more ahead of me. The high beams will not engage pushing the stick forward . If I put the switch on manual then the high beams work
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Old Mar 25, 2021 | 12:30 PM
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GLC 300d 4matic
Welcome to the frustrating world of Auto LEDs.
In auto mode your high beams will only come on after you have reached a certain speed and provided you are not in a built up area.....that's how they work on European models anyway!!
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Old Mar 25, 2021 | 08:58 PM
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GLS 450
Decorily is correct. The auto high beams will only come on at highway speeds and not at all in urban areas. They do work very well on rural highways.
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Old Mar 26, 2021 | 09:16 AM
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Very interesting.. In the states it works for me at any speed. LOL
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Old Mar 26, 2021 | 11:47 AM
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Originally Posted by mikey08
Very interesting.. In the states it works for me at any speed. LOL
Indeed maybe the OPs should work like yours do...I am referring to Euro Multibeams so I could be totally wrong! !
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Old Mar 27, 2021 | 06:45 PM
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Originally Posted by mikey08
Very interesting.. In the states it works for me at any speed. LOL
Interesting. In my experience, as well as "according to the manual," the high beams should activate above 18mph (30kph), if all other parameters are met.
Are you sure that they are on below 15 - 18 mph?
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Old Mar 27, 2021 | 07:53 PM
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GLS 450
Originally Posted by mikapen
Interesting. In my experience, as well as "according to the manual," the high beams should activate above 18mph (30kph), if all other parameters are met.
Are you sure that they are on below 15 - 18 mph?

In the X166 LED headlights were an option. It was called something like the 'lighting package'. Pretty sure the 'highbeam assist' was part of that package. If the GLS doesn't have the LED lighting package, then the high beams work whenever you manually switch them on. So the highbeams work differently depending on what type of headlights your car was equipped with.
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Old Mar 28, 2021 | 12:58 AM
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You can turn off auto high beam assist. Then you can control as you wish like normal. I disabled it as it was too late and turning on or too early turning off. Or I wanted them on to give better light and wouldn’t bc of the assist being on.
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