Rear dome light stopped working
Thread Starter
Junior Member
Joined: May 2019
Posts: 70
Likes: 6
2010 E550 4MATIC
Rear dome light stopped working
Hi all, I replaced my rear dome light with LEDs. I took apart the cover and replaced all 3 and tested them before putting it back together. Both map lights worked and the center light was on as my door was open. I put everything back together and tested again map lights work but the rear center dome does not no matter whether doors open or I hit the button from the front console. Tried 3 different bulbs and even the original and nothing works. I checked fuse 17 and it was fine, checked fuse 57 but I did not have one there in my car.
I tested with a tester and looks like there is a negative signal.
Any thoughts?
I tested with a tester and looks like there is a negative signal.
Any thoughts?
MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,141
Likes: 1,293
From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
Hi all, I replaced my rear dome light with LEDs. I took apart the cover and replaced all 3 and tested them before putting it back together. Both map lights worked and the center light was on as my door was open. I put everything back together and tested again map lights work but the rear center dome does not no matter whether doors open or I hit the button from the front console. Tried 3 different bulbs and even the original and nothing works. I checked fuse 17 and it was fine, checked fuse 57 but I did not have one there in my car.
I tested with a tester and looks like there is a negative signal.
Any thoughts?
I tested with a tester and looks like there is a negative signal.
Any thoughts?
Thread Starter
Junior Member
Joined: May 2019
Posts: 70
Likes: 6
2010 E550 4MATIC
The overhead console in the front correct? I did hit the button to turn it on/off when the door was closed but it also did not do anything. Ordered a used replacement module that I will test later this afternoon if it arrives.
Member
Joined: Apr 2010
Posts: 107
Likes: 7
From: Ohio
2014 E550 sedan
Replaced mine with LED's a while ago. Rear light works fine 60% of the time. It likes to be a bit temperamental, for example if the car has been running, and the doors open, it won't turn on.. But, if the doors are opening from the outside (ie unlocking, then opening) it works.. It is slightly annoying, but not enough to make me tear it apart again..
That being said, make sure your LED is facing the correct way. My finicky light aside, if I were to open the rear housing and flip contact sides of the LED, it would not work at all. I am by no means an electrician, however, if I remember correctly, it has something to do with the LED having a positive and negative side. (Someone please correct me if I am mistaken..)
That being said, make sure your LED is facing the correct way. My finicky light aside, if I were to open the rear housing and flip contact sides of the LED, it would not work at all. I am by no means an electrician, however, if I remember correctly, it has something to do with the LED having a positive and negative side. (Someone please correct me if I am mistaken..)
SPONSOR/MBworld Guru
Joined: Jul 2010
Posts: 6,936
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From: California
MB W204/W212, BMW E66, Porsche 958, VW MK6 TDI, Maserati Ghibli SQ4
Yes, most LEDs are polarity dependent. Also, having canbus capability will resolve some of those power fluctuation issues with current leakage.
Thread Starter
Junior Member
Joined: May 2019
Posts: 70
Likes: 6
2010 E550 4MATIC
I noticed there is a separate off button for turning the dome lights off to not turn on when the doors open. well I connected my rear dome light and hit that off button and turned it back on and looks like that did it kind of like a reset. all is working now!
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MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,141
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From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
So that kill switch works...
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Newbie
Joined: Jan 2021
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2011 E220 CDI
Same thing!
Replaced mine with LED's a while ago. Rear light works fine 60% of the time. It likes to be a bit temperamental, for example if the car has been running, and the doors open, it won't turn on.. But, if the doors are opening from the outside (ie unlocking, then opening) it works.. It is slightly annoying, but not enough to make me tear it apart again..
That being said, make sure your LED is facing the correct way. My finicky light aside, if I were to open the rear housing and flip contact sides of the LED, it would not work at all. I am by no means an electrician, however, if I remember correctly, it has something to do with the LED having a positive and negative side. (Someone please correct me if I am mistaken..)
That being said, make sure your LED is facing the correct way. My finicky light aside, if I were to open the rear housing and flip contact sides of the LED, it would not work at all. I am by no means an electrician, however, if I remember correctly, it has something to do with the LED having a positive and negative side. (Someone please correct me if I am mistaken..)
