Auto hi-Beam
07-16-2007, 10:34 PM
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My Ride: 2004 545i 6 spd Sports Package | NAV | PDC | Logic 7 | BT retrofit | SW V13.3
I have a sensor/reflector on the back of my rear view mirror. This was not there on my 545i. Does anyone know what this is for and if it is an auto hi-beam then how do I activate it?
07-17-2007, 12:58 AM
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No, it doesn't looks like it. It looks like a camera and it's placed under the rain sensor.
07-17-2007, 04:22 AM
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Auto Hi-beam is activated by pushing the hi-beam stick on your left side and you will see a specific symbol lighting in your dash if I am not mistaken.
07-17-2007, 05:00 AM
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I think the sensor behind the mirror (as pictured) is the forward-facing light sensor for the automatic dimming mirror. The mirrror has a rearward-facing sensor near the bottom center of the reflective surface. The mirror compares the difference between the forward and rearward sensors to determine if it should be "dimmed".
The one in the picture looks a little different than the pre-LCI cars but if the mirror has the dimming function, then there has to be a sensor located in that area.
I'm not sure if auto-high beam is available in the US. I don't remember seeing it listed as an option when I ordered my car...
The one in the picture looks a little different than the pre-LCI cars but if the mirror has the dimming function, then there has to be a sensor located in that area.
I'm not sure if auto-high beam is available in the US. I don't remember seeing it listed as an option when I ordered my car...
07-17-2007, 06:12 AM
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Originally Posted by Rudy' post='448857' date='Jul 17 2007, 02:00 PM
I think the sensor behind the mirror (as pictured) is the forward-facing light sensor for the automatic dimming mirror.
Now if it were one of the sensors to determine light level for the operation of "automatic headlights" then I could better understand the need to measure ambient light from that orientation.
Now that I've looked at my car, this is the same as on my pre-LCI and I have auto-dim functionality.
ABC
07-17-2007, 07:10 AM
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Originally Posted by aybeesea' post='448877' date='Jul 17 2007, 10:12 AM
Interesting idea to have a sensor measuring forward-incident light for that function! Those Germans seem to think of everything.
Now if it were one of the sensors to determine light level for the operation of "automatic headlights" then I could better understand the need to measure ambient light from that orientation.
Now that I've looked at my car, this is the same as on my pre-LCI and I have auto-dim functionality.
ABC
Now if it were one of the sensors to determine light level for the operation of "automatic headlights" then I could better understand the need to measure ambient light from that orientation.
Now that I've looked at my car, this is the same as on my pre-LCI and I have auto-dim functionality.
ABC
Try this trick -- in the daytime, just cover the forward-facing sensor with your finger. The mirrors will dim fairly quickly. As soon as you remove your finger, they'll brighten again...
07-17-2007, 09:27 AM
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Originally Posted by Rudy' post='448905' date='Jul 17 2007, 08:10 AM
I don't know if it was the Germans who invented the auto-dimming mirror. All of them have the two sensors. If they didn't, the mirror would darken in the daylight. The forward sensor determines if it's dark outside so that if light hits the rear sensor, the mirror will dim. During the day, light always hits the rear sensor so the only way for the mirror to know if it should dim or not is to see how much light is in front of the car as well.
Try this trick -- in the daytime, just cover the forward-facing sensor with your finger. The mirrors will dim fairly quickly. As soon as you remove your finger, they'll brighten again...
Try this trick -- in the daytime, just cover the forward-facing sensor with your finger. The mirrors will dim fairly quickly. As soon as you remove your finger, they'll brighten again...