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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Rear view mirror not dimming as much as I would like



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      10-12-2016, 09:17 PM   #1
lordbmw
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Rear view mirror not dimming as much as I would like

I noticed that my rear view mirror doesn't dim as much as I would like sometimes especially around dawn or dusk.

The side mirrors seem to do a better job at that.

I bought the car used so I don't know if it was better at one point. May be that's just the way BMWs are.

I came from an older Mustang where you just flipped the rear view mirror down when you needed to.

I tested the rear view mirror dimming with a flash light and it's definitely working but not as well as I would like.

Anyone else experience this?
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      10-13-2016, 08:02 AM   #2
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I bought a stripper E91 with manual shift, seats, and mirror. Other BMWs I had did have the auto dim and there were times it did not seem to dim enough. Sometimes I just manually moved it a bit upward to reduce the glare, similar to what a flip button would do.

The auto dim mirrors do fail, but usually you see defects in the mirror and the car is a lot older than yours. RealOEM.com has the part numbers in the Vehicle Trim section. I recall there are vendors who rebuild these for a lot less cost than new.
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      10-13-2016, 11:23 AM   #3
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If given the choice, I'd opt for manually dimming mirrors any day. Unfortunately, it is what it is.

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      10-13-2016, 11:25 AM   #4
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Quote:
Originally Posted by lordbmw View Post
I noticed that my rear view mirror doesn't dim as much as I would like sometimes especially around dawn or dusk.

The side mirrors seem to do a better job at that.

I bought the car used so I don't know if it was better at one point. May be that's just the way BMWs are.

I came from an older Mustang where you just flipped the rear view mirror down when you needed to.

I tested the rear view mirror dimming with a flash light and it's definitely working but not as well as I would like.

Anyone else experience this?
How heavily is the rear window tinted?
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      10-13-2016, 11:34 AM   #5
lordbmw
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Quote:
Originally Posted by justpete View Post
How heavily is the rear window tinted?
I think the car is stock - no tint.

I bought the car used.
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      10-16-2016, 06:02 PM   #6
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I have the same complaint with mine. My old e90 had the manually-dimming mirror and there have been many times where I've thought about swapping the auto-dimming one for a simple manual type, but I suspect I'd then lose the dimming feature on the outside mirrors. I usually end up either aiming the mirror upward or raising the rear sunshade. "Progress"
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      10-16-2016, 07:56 PM   #7
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Mine works very well--except when I have my rear shade up. Then it pretty much doesn't do anything. Same effect on my side-view.
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      10-16-2016, 10:17 PM   #8
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They work just not when someone is tailgating u but then I just turn of my rear dogs and all is well
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      11-13-2017, 09:55 PM   #9
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If I replace the OEM mirror with a generic aftermarket mirror, will it trigger any codes or have any problems? My mirror has a few issues, and I don't care about the compass feature or Homelink that are on my current mirror.

From what I can tell, I have the 51169192321 mirror, EC/LED/GTO/compass/RC, but not alarm. I confirmed this at BMWVIN that I have S5GAA, Preparation for Alarm.

From another thread: http://www.e90post.com/forums/showthread.php?t=1244112

Alarm "LED" (is this identified by red dot?)
FLA = automatic high beam via light sensor
Compass
Homelink garage opener
EC = "Electrochromatic" Auto dim (dip)
Rain sensor
ETC = Electronic Toll Collection
RC = remote control (not sure what this is. possibly just the key FOB receiver)
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