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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 10-16-2013, 09:50 AM
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Zooks527 Zooks527 is online now
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Is there a gain setting on the EC mirror?

Good afternoon.

As it's been getting dark earlier, I've been driving home in traffic where everyone has their lights on. Naturally, there's a fair percentage of clueless dweebs driving with their high beams continually on.

Last Friday night, I thought that my rearview mirror wasn't getting dark, but as it was on the edge of twilight, I wasn't sure if it was really dark enough to have it working fully. I did some poking when I got home, and it seemed to be working correctly if I spoofed the sensors by either blocking the forward light sensor or directing a light into the rearward sensor.

Last night it was clear that the mirror wasn't darkening. I covered the forward sensor with my hand, and the exterior mirrors went fully dark while the interior didn't change much at all. I then covered the rearward sensor, and the exterior mirrors went clear. I did the same sequence a few more times and the interior mirror suddenly went dark along with the exteriors. I took my hand away, and the mirrors behaved correctly the rest of the ride home.

Based on the above, it appears that the sensors are working correctly, as the exterior mirror function is fine. The issue appears to be with the electrochromatic function of the interior.

It could just be that it's getting old and needs to be replaced. However, at $670 for a new one (part cost only), that's a bill I'd prefer to avoid. The restoration of function after a few full ROM swings on the sensors make me wonder (with more than a little blind hope) if there's an adjustable control loop in the system that drives the darkness setting. If so, kicking the gain up on that loop may help the situation.

Anyone know if the control loop (there's has to be one, just to get the varying darkness levels seen in normal operation) can be tweaked, or should I start looking for a "new to me" mirror at the online parts places?

Regards,
George
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Last edited by Zooks527; 10-16-2013 at 09:52 AM.
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  #2  
Old 10-16-2013, 09:59 AM
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cwinter cwinter is offline
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It sound more to me that there is an intermittent failure rather than the need to adjust gain levels. I agree that clearly a control loop runs but I believe that unlike the rain sensor, which can be adjusted beyond the gain settings on the stalk, the rearview mirror does not have this.

It also sounds form your narrative that previously this function worked fine and now it does not, so I think I'd try to pick up a new to me mirror and see where it goes. I figure if you know how to remove and install, just about any accident vehicle should have a functioning one?
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  #3  
Old 10-16-2013, 10:22 AM
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Quote:
Originally Posted by cwinter View Post
It sound more to me that there is an intermittent failure rather than the need to adjust gain levels. I agree that clearly a control loop runs but I believe that unlike the rain sensor, which can be adjusted beyond the gain settings on the stalk, the rearview mirror does not have this.

It also sounds form your narrative that previously this function worked fine and now it does not, so I think I'd try to pick up a new to me mirror and see where it goes. I figure if you know how to remove and install, just about any accident vehicle should have a functioning one?
Yeah, I'm in the same area on what may be going on, but I'd rather not spend the $ if I don't need to.

I know there's no driver-workable gain adjustment (ala the rain sensor). I was hoping there may be one reachable though INPA or the like, but that may be wishing in vain.
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ED May 12, 2009, Munich dropoff May 16, Redelivery June 22, 2009




Prior 33 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette (kept until first Bronco) / 1981 Subaru GL wagon AWD / 1983 s10 Blazer 4x4 (big mistake) / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion
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Old 10-16-2013, 10:35 AM
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cwinter cwinter is offline
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Quote:
Originally Posted by Zooks527 View Post
Yeah, I'm in the same area on what may be going on, but I'd rather not spend the $ if I don't need to.

I know there's no driver-workable gain adjustment (ala the rain sensor). I was hoping there may be one reachable though INPA or the like, but that may be wishing in vain.
Perhaps a friendly dealer or indy might be able to disclose this? Perhaps ping DSX in case he does not see this thread?
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  #5  
Old 10-16-2013, 10:58 AM
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Zooks527 Zooks527 is online now
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Quote:
Originally Posted by cwinter View Post
Perhaps a friendly dealer or indy might be able to disclose this? Perhaps ping DSX in case he does not see this thread?
Couldn't hurt.
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ED May 12, 2009, Munich dropoff May 16, Redelivery June 22, 2009




Prior 33 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette (kept until first Bronco) / 1981 Subaru GL wagon AWD / 1983 s10 Blazer 4x4 (big mistake) / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion
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  #6  
Old 10-16-2013, 05:22 PM
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Quote:
Originally Posted by Zooks527 View Post
Good afternoon.

As it's been getting dark earlier, I've been driving home in traffic where everyone has their lights on. Naturally, there's a fair percentage of clueless dweebs driving with their high beams continually on.

Last Friday night, I thought that my rearview mirror wasn't getting dark, but as it was on the edge of twilight, I wasn't sure if it was really dark enough to have it working fully. I did some poking when I got home, and it seemed to be working correctly if I spoofed the sensors by either blocking the forward light sensor or directing a light into the rearward sensor.

Last night it was clear that the mirror wasn't darkening. I covered the forward sensor with my hand, and the exterior mirrors went fully dark while the interior didn't change much at all. I then covered the rearward sensor, and the exterior mirrors went clear. I did the same sequence a few more times and the interior mirror suddenly went dark along with the exteriors. I took my hand away, and the mirrors behaved correctly the rest of the ride home.

Based on the above, it appears that the sensors are working correctly, as the exterior mirror function is fine. The issue appears to be with the electrochromatic function of the interior.

It could just be that it's getting old and needs to be replaced. However, at $670 for a new one (part cost only), that's a bill I'd prefer to avoid. The restoration of function after a few full ROM swings on the sensors make me wonder (with more than a little blind hope) if there's an adjustable control loop in the system that drives the darkness setting. If so, kicking the gain up on that loop may help the situation.

Anyone know if the control loop (there's has to be one, just to get the varying darkness levels seen in normal operation) can be tweaked, or should I start looking for a "new to me" mirror at the online parts places?

Regards,
George
Geez, George, don't be so hard on yourself.
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  #7  
Old 10-17-2013, 01:32 AM
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Zooks527 Zooks527 is online now
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Quote:
Originally Posted by Thunder Dump View Post
Geez, George, don't be so hard on yourself.
You know, sometimes I feel like an older car. Stuff starts wearing out, can't get new parts, ...
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ED May 12, 2009, Munich dropoff May 16, Redelivery June 22, 2009




Prior 33 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette (kept until first Bronco) / 1981 Subaru GL wagon AWD / 1983 s10 Blazer 4x4 (big mistake) / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion
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Old 10-17-2013, 04:27 AM
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Quote:
Originally Posted by Thunder Dump View Post
Geez, George, don't be so hard on yourself.
Only five posts in before the potshots at Zooks began...has to be a record.
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Old 10-17-2013, 06:00 AM
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All of my current BMW's auto dimming mirrors function like this.
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  #10  
Old 10-17-2013, 06:39 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Zooks527 View Post
Last Friday night, I thought that my rearview mirror wasn't getting dark, but as it was on the edge of twilight, I wasn't sure if it was really dark enough to have it working fully. I did some poking when I got home, and it seemed to be working correctly if I spoofed the sensors by either blocking the forward light sensor or directing a light into the rearward sensor.

Last night it was clear that the mirror wasn't darkening. I covered the forward sensor with my hand, and the exterior mirrors went fully dark while the interior didn't change much at all. I then covered the rearward sensor, and the exterior mirrors went clear. I did the same sequence a few more times and the interior mirror suddenly went dark along with the exteriors. I took my hand away, and the mirrors behaved correctly the rest of the ride home.

Have you added a tint to your windows?

I see no adjust on the outside of mine;no circuit diagram of the mirror surfaced. Pinout's below - if pin 1 has a voltage, mirror will not dim! Appears to go high when transmission is placed in reverse.

If you come across a mirror circuit diagram, please post!


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  #11  
Old 10-17-2013, 07:06 AM
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Zooks527 Zooks527 is online now
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Quote:
Originally Posted by CALWATERBOY View Post
Have you added a tint to your windows?
Nope. Fully stock on the glass, and no changes prior to it beginning to act strangely. In any event, if it were an issue with transmission through the rear glass, the outside mirrors would be acting strangely in concert with the interior mirror, as all three mirrors run off the same forward looking / rearward looking sensor pair. With the outside mirrors behaving normally, it sure looks to be an issue with the inside mirror darkening circuit.



Quote:
Originally Posted by CALWATERBOY View Post
I see no adjust on the outside of mine;no circuit diagram of the mirror surfaced. Pinout's below - if pin 1 has a voltage, mirror will not dim! Appears to go high when transmission is placed in reverse.
Interesting that voltage holds it clear. I would have thought they'd do zero volts for clear / high for dark, just to insure it failed clear if a signal failure occurred.
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ED May 12, 2009, Munich dropoff May 16, Redelivery June 22, 2009




Prior 33 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette (kept until first Bronco) / 1981 Subaru GL wagon AWD / 1983 s10 Blazer 4x4 (big mistake) / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion

Last edited by Zooks527; 10-17-2013 at 07:09 AM.
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Old 10-17-2013, 11:12 AM
fdriller9 fdriller9 is offline
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I know auto headlight sensitivity can be adjusted via coding, but not sure about the auto dim function. I know it can be disabled but I've never had anyone ask me to adjust the sensitivity of the mirror.
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Old 10-18-2013, 10:22 AM
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Most of time when my mirrors dim on my BMW's, it makes no sense when it does.
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