2006 ML500 auto dimming mirror is dark during the day time.

Many thanks for your response. Ok, I know that, but it dims anytime. After I turn the car on before I leave the garage. Through the mountains where the sun is not bright. In the early evening after the sun goes down. There is definitely something wrong? Yes, No?

Well, if it seems abnormal to you and not performing as well as it use to then the mirror itself may be failing.