XC60 2012 Internal rearview mirror sensor

Adrian B · Oct 3rd, 2021, 17:22

Just noticed on my car that the interior rearview mirror has had the front facing light sensor clear lens taped over!
I have remove the tape!
Anyone an idea why it would be covered over in the first place? Regards

rxtian · Oct 4th, 2021, 13:35

I think it would make the mirror more likely to activate the auto-dimming, so perhaps someone wanted the mirror perminantly dim?

Deck1ng · Oct 4th, 2021, 20:20

Quote:

Originally Posted by rxtian

I think it would make the mirror more likely to activate the auto-dimming, so perhaps someone wanted the mirror perminantly dim?

Would the auto dimming sensor be on the front face of the rv mirror, surely any dimming needs to be sensed from the rear? Just a thought!

jasmith44 · Oct 4th, 2021, 23:07

Maybe he means front facing him as he is sat in the drivers seat.

rxtian · Oct 4th, 2021, 23:18

The mirror works by measuring the ratio of the light coming into the mirror vs the light coming into the windscreen, if the light in the mirror is bright compared to the windscreen it dims.

So covering the windscreen side would make it dim more, covering the cabin side would make it dim less.

jasmith44 · Oct 5th, 2021, 09:55

And there's me thinking it was anti-dazzle from headlights behind.

rxtian · Oct 5th, 2021, 10:25

It is - if the headlights shining into the mirror are bright compared to the ambient light (measured in front of the mirror) it dims for you.

Adrian B · Oct 5th, 2021, 10:34

That makes sense then. The previous owner covered the ambient light sensor facing the windscreen to inhibit the dimming process due to the R design already having tinted rear windows. I will see for myself in good time. I might even decide to recover the front facing sensor myself😳 regards

glynh · Oct 5th, 2021, 10:45

Quote:

Originally Posted by Adrian B

That makes sense then. The previous owner covered the ambient light sensor facing the windscreen to inhibit the dimming process due to the R design already having tinted rear windows. I will see for myself in good time. I might even decide to recover the front facing sensor myself😳 regards

I had a Mondeo 10+ years back with factory tinted rear windows. At night it was a nightmare as could barely see anything other than lights, so if the R design is simialr a tinted mirror will not help at all!

Deck1ng · Oct 5th, 2021, 11:26

Automatic dimming
The rearview mirror contains two sensors - one forward facing and one rearward facing - that work together to identify and eliminate dazzling light. The forward facing sensor detects ambient light, while the rearward facing sensor detects the light from vehicle headlights behind.

Found this 😊

Oct 3rd, 2021, 17:22	#1
Adrian B Member Last Online: Mar 29th, 2023 23:27 Join Date: Nov 2020 Location: Worksop	XC60 2012 Internal rearview mirror sensor Just noticed on my car that the interior rearview mirror has had the front facing light sensor clear lens taped over! I have remove the tape! Anyone an idea why it would be covered over in the first place? Regards

Oct 4th, 2021, 23:07	#4
jasmith44 jasmith44 Last Online: Today 09:45 Join Date: Nov 2007 Location: burnley	Maybe he means front facing him as he is sat in the drivers seat. __________________ 244 / 460 / 440 /850x2/ s40x2 / s80 / s60 2.0t/ S60 ES T3. Current 2008 S80 2.5 SE T A.

Oct 5th, 2021, 09:55	#6
jasmith44 jasmith44 Last Online: Today 09:45 Join Date: Nov 2007 Location: burnley	And there's me thinking it was anti-dazzle from headlights behind. __________________ 244 / 460 / 440 /850x2/ s40x2 / s80 / s60 2.0t/ S60 ES T3. Current 2008 S80 2.5 SE T A.

Oct 5th, 2021, 11:26	#10
Deck1ng Master Member Last Online: Apr 14th, 2024 13:04 Join Date: Apr 2018 Location: North Yorkshire	Automatic dimming The rearview mirror contains two sensors - one forward facing and one rearward facing - that work together to identify and eliminate dazzling light. The forward facing sensor detects ambient light, while the rearward facing sensor detects the light from vehicle headlights behind. Found this 😊 __________________ Current, XC60 AWD D5 SE DRIVe 1st motor. Austin A35, indicators and heater optional. Not forgetting RTFM

Oct 4th, 2021, 13:35	#2
rxtian Senior Member Last Online: Oct 30th, 2023 18:03 Join Date: May 2011 Location: Southampton	I think it would make the mirror more likely to activate the auto-dimming, so perhaps someone wanted the mirror perminantly dim?

Oct 4th, 2021, 23:18	#5
rxtian Senior Member Last Online: Oct 30th, 2023 18:03 Join Date: May 2011 Location: Southampton	The mirror works by measuring the ratio of the light coming into the mirror vs the light coming into the windscreen, if the light in the mirror is bright compared to the windscreen it dims. So covering the windscreen side would make it dim more, covering the cabin side would make it dim less.

Oct 5th, 2021, 10:25	#7
rxtian Senior Member Last Online: Oct 30th, 2023 18:03 Join Date: May 2011 Location: Southampton	It is - if the headlights shining into the mirror are bright compared to the ambient light (measured in front of the mirror) it dims for you.

Oct 5th, 2021, 10:34	#8
Adrian B Member Last Online: Mar 29th, 2023 23:27 Join Date: Nov 2020 Location: Worksop	That makes sense then. The previous owner covered the ambient light sensor facing the windscreen to inhibit the dimming process due to the R design already having tinted rear windows. I will see for myself in good time. I might even decide to recover the front facing sensor myself😳 regards

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