My eyes are not fully open yet, and I have to take SWMBO to Salford Quays for some market she spotted.
Quick lok at page 29 on the diagram does show two sensors, a humidity one and a light one.
Sorry due to high levels of earache no time to dig any deeper
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Ray at Wigan Pier
2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore..
In progress, Nothing left to do.
Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter)