S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Tail "fog"lights

Old Sep 29, 2012 | 10:27 PM
  #1  
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Tail "fog"lights

whats the deal with the rear tail fog light .. only one lights up? Curious... but seriously a bunch of engineers from The Technische Universität München (TUM) or where ever they come from couldnt get both to work ...
I really need an answer on this one
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Old Sep 29, 2012 | 10:51 PM
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your right tail light is busted my friend - they should both work. get it checked.
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Old Sep 30, 2012 | 02:07 AM
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I thought only one fog light on the rear is supposed to light up?
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Old Sep 30, 2012 | 03:27 AM
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Only one side suppose to light up. Not sure how it should work on all benzes. But know for sure that W210 E-class, W220 S-class and W221 are like that
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Old Sep 30, 2012 | 04:30 AM
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Only one intentionally lights up by design. It's like this on all cars.

I don't know if this is the actual reason but I heard only one side lights up because if both sides were lit it would detract from other drivers noticing the brake lights coming on as the rear fog is so bright. This would cause a higher risk of accidents because people can't see the brake lights light up as well.
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Old Sep 30, 2012 | 08:06 AM
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Originally Posted by xxGenericSNxx
Only one intentionally lights up by design. It's like this on all cars.

I don't know if this is the actual reason but I heard only one side lights up because if both sides were lit it would detract from other drivers noticing the brake lights coming on as the rear fog is so bright. This would cause a higher risk of accidents because people can't see the brake lights light up as well.
+1
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Old Sep 30, 2012 | 08:16 AM
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Originally Posted by xxGenericSNxx
Only one intentionally lights up by design. It's like this on all cars.

I don't know if this is the actual reason but I heard only one side lights up because if both sides were lit it would detract from other drivers noticing the brake lights coming on as the rear fog is so bright. This would cause a higher risk of accidents because people can't see the brake lights light up as well.
That sounds logical thanks now to figure out how to get the fog lights to work independently
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Old Sep 30, 2012 | 10:14 AM
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Same on the porsches, only the left side should light up.
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Old Sep 30, 2012 | 02:49 PM
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The MB guy I talked to said the left side should only light up. In Europe, its the right side.
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Old Sep 30, 2012 | 05:36 PM
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Originally Posted by RT2010
your right tail light is busted my friend - they should both work. get it checked.
Its designed to work like that on MB vehicles.
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Old Sep 30, 2012 | 09:23 PM
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Originally Posted by Sako
The MB guy I talked to said the left side should only light up. In Europe, its the right side.
I seem to remember it being the left in Europe, also.
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Old Sep 30, 2012 | 09:31 PM
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I wonder if in RHD countries that only the right side lights up.
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Old Sep 30, 2012 | 10:41 PM
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Originally Posted by xxGenericSNxx
I wonder if in RHD countries that only the right side lights up.
That is correct.

If you look at the W203 tailight harness you will actually see that the left fog wire is missing.
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Old Oct 1, 2012 | 09:28 AM
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Only the Left

I have had several Volvo's and it was always just the left rear tail light that lit for the fog light.
Michael in Arizona
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Old Oct 1, 2012 | 10:18 AM
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haha, I wonder how many people say "hey look...what's wrong with the tail lights on that Benz?"
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Old Oct 1, 2012 | 06:20 PM
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Originally Posted by hyperion667
haha, I wonder how many people say "hey look...what's wrong with the tail lights on that Benz?"
That's funny... My brother was following me while I was driving (highway) my wifes 12'C250 on a rainy day... I had put the fogs on. He took great pleasure in telling me that the brand new car had an electrical problem.
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Old Oct 1, 2012 | 06:55 PM
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Originally Posted by Tomspo04
That's funny... My brother was following me while I was driving (highway) my wifes 12'C250 on a rainy day... I had put the fogs on. He took great pleasure in telling me that the brand new car had an electrical problem.
lol, so it IS true.....


thanx for helping me confirm
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