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Message: <blockquote data-quote="jarance" data-source="post: 322405" data-attributes="member: 21">Have a closer check last Sunday and found there are actually 2 sensors.One is located just under the mirror (centre top) and the other is located on the back of the mirror casing. Apparently, the dimmer compared the front intensity and rear intensity in order to adjust the dimmer.That means daytime, the dimmer do not dim even though somebody have its high beam on.There is another sensor on the windscreen which is part of the mirror support. I presume that it the auto rain sensor. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes    :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></blockquote>