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My own observations while driving on the highway the other night (or two). The side mirror was acting independent of the rear view mirror. The rear would be dimming for the cars behind, but the side would not be dimmed. The side mirror would only dim when a car was specifically seen in the side mirror. The tell-tale sign (besides not being blinded) is that the background turns black in the presence of light. My old audi had a small bug where the auto dimming didn't work on rare occasions (once a year) and the black background was the most definitive way to determine if the auto dimming feature was working.
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