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One side light on?

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Old Apr 8, 2020 | 09:14 AM
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2018 AMG C43 Coupe
One side light on?
In the garage this morning I noticed a faint light against the wall. I though it was the suns reflection at first but then noticed that my passenger side marker light is on? Not sure what could be causing that, this can't be normal. I got back from the office early afternoon yesterday and have not moved it since. Also I keep my key in the office which is a good 25 feet from the car.
Edit - I did start the car and then turn it off The light remained on while the other side was off.


Driver side

Passenger side. Little light in the middle
Last edited by wsboxer1; Apr 8, 2020 at 09:23 AM. Reason: Updated info
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Old Apr 8, 2020 | 11:22 AM
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2019 C43 AMG Coupe
Is your right standing light switched to on?
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Old Apr 8, 2020 | 11:55 AM
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Originally Posted by batman719
Is your right standing light switched to on?
I am not certain what a right standing light switch is. Lights are set to Auto and no turn signals or anything are on. Actually taking it into service this afternoon since I am free.
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Old Apr 8, 2020 | 11:57 AM
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Originally Posted by wsboxer1
I am not certain what a right standing light switch is. Lights are set to Auto and no turn signals or anything are on. Actually taking it into service this afternoon since I am free.
Owner's manual, page 114. However, if your lights are set to Auto, then this is not the problem. Definitely something else going on. Hope it's a quick and painless diag and fix for you!
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Old Apr 8, 2020 | 12:05 PM
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Originally Posted by wsboxer1
I am not certain what a right standing light switch is. Lights are set to Auto and no turn signals or anything are on. Actually taking it into service this afternoon since I am free.


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Old Apr 8, 2020 | 01:28 PM
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Originally Posted by batman719
Owner's manual, page 114. However, if your lights are set to Auto, then this is not the problem. Definitely something else going on. Hope it's a quick and painless diag and fix for you!
Ah, well thank you. Heading in soon and will update with what was found!
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Old Apr 13, 2020 | 10:46 AM
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Just as an update to this, they ended up replacing the front SAM control unit and things are back to normal.
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Old Apr 13, 2020 | 12:22 PM
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Front SAM failure is fairly common and really random things can occur. Most often it’s because the SAM got wet.
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