Exterior mirror glass markings - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 03-28-2007, 04:05 PM Thread Starter
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Exterior mirror glass markings

I have noticed a dashed black line running vertically on my 2004 CLK exterior mirrors glass.

Can anyone tell me what this is all about. If it is something to do with mirror heating, what would turn it on?
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post #2 of 4 (permalink) Old 03-28-2007, 10:36 PM
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The part of the mirror outside of the thin line is set up to slightly compress the reflection laterally to give you a wider point of view. It does not compress the reflection on the vertical plane so the image doesn't appear that distorted and hard to interpret like the minature "stick-on spot" mirrors so popular here in the USA. The inboard 3/4 of the aspheric mirror is straight glass and the outboard 1/4 is convex to peer into the blind spot.
This is a safety feature that has been on most German cars for at least the last twelve years or more. After you get used to how it works to minimize blind spots you will find yourself missing its wide angle view when you get back into a car without it.
Because of the out of date laws regarding vehicle safety this feature cannot be found on vehicles conforming to USA DOT rules but these European aspheric mirrors can be purchased through better OEM parts sources in Europe and Asia since they should be considered replacement parts by everyone outside of where US DOT rules apply.

Since you have the aspheric mirrors on your MB here are some pictures of an older BMW and a 4th gen VW Golf with them. All of my European cars have been retrofitted with them because of their improvement to safety.
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post #3 of 4 (permalink) Old 03-29-2007, 07:43 AM
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Nice answer, n5160u - I had seen these mirrors in Germany even during the '80's and thought they were great. Sometimes I can't get over the U.S. Department of Transportation. I have heard it said that it is like a dinosaur - if you whacked it on the tail, it would take years for the pain impulse to reach the brain.


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post #4 of 4 (permalink) Old 03-29-2007, 12:27 PM Thread Starter
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Yes, many thanks n5160u for a very comprehensive answer. It's just what these forums are all about.

Now that you have explained it, I have re-checked the reflection and it is indeed as you state. How about that... I had not realised that before. And I'm surprised to hear that it's something that our American cousins are not allowed to get.

Regarding the 'heated mirror' question I note from my Owner's Manual that 'the mirrors are heated automatically at low outside temperatures'. So it's managed by the computer.
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