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Audi A8, A8 L: 2004 and later (D3) I get "Light sensor failure" warning light when I turn on the light switch


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Last Post: Nov 27, 2011 12:58 PM Last Post By: Pj2116
barrykir

Posts: 2
Registered: 01/06/09
I get "Light sensor failure" warning light when I turn on the light switch
Posted: Jan 27, 2009 2:35 PM
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Hi All
I have an early version of the 2004 A8L. The light sensor is different from the later 2004s. The side view mirrors get dark as soon as I turn on the car (day or night) and the rear view mirror never darkens. I replaced the light recognition sensor ($150) but that didn't do it. Any suggestions?
barrykir

Posts: 2
Registered: 01/06/09
Re: I get "Light sensor failure" warning light when I turn on the light switch
Posted: Feb 15, 2009 2:43 PM   in response to: barrykir in response to: barrykir
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If the battery gets low or is replaced the whole system needs to be reset. On my A8L 2004 the only way I could do that is to pull all the fuses on the passengers side.
Astle

Posts: 6
Registered: 09/21/14
Re: I get "Light sensor failure" warning light when I turn on the light switch
Posted: Mar 13, 2009 3:44 PM   in response to: barrykir in response to: barrykir
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You have to re-boot the light sensor system. I did this by removing the fuses for 10 seconds and then reinstalling. (I did ALL of the fuses, one at a time.) My rear view mirror didn't work, replaced the sensor.... still didn't work, the a mechanic told me to re-boot) Since re-booting, mirror has worked perfectly for over a year!
Pj2116

Posts: 1
Registered: 11/27/11
Re: I get "Light sensor failure" warning light when I turn on the light switch
Posted: Nov 27, 2011 12:57 PM   in response to: Astle in response to: Astle
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Do you need to pull only the light system related fuses of all of the passenger side fuses on that panel?
Also, does the power need to be on or off during the process?

Edited by: Pj2116 on Nov 27, 2011 12:57 PM

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