There most be something in the air. My 16:9 display is getting dimmer too. It seems related to temperature. It is darkest on cold mornings when I start the car. It usually gets a bit brighter by the time I get to the office. It is hard to read on cold days in sunlight.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input