My MKIV stays at whatever I last set it to.

Thanks sleuth255
I have a MKIV
It's a trip to the Stealers then!

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X5 3.0D Sport 2002.
SatNav, Tv, Phone, Aero Kit, Comfort seats, Heated Front & Rear Seats, Xenons, CD Changer, Sun Protection Glass, Tow Kit, Electric Folding Mirrors, Reversing Camera.

Mods
Digital Radio, Twin DVD Roof Screens, Xenon High Beams, Colour Trafficmaster, Roadpilot Pro with Laser.

I normally keep my screen brightness at almost the absolute minimum since that control only affects minimum brightness. Generally, this setting is what's used when you're driving at night. During the day, a photocell adjusts the brightness upward as much as necessary.

Interestingly, I just had my screen assembly replaced because that photocell failed. The failure meant that I had to start adjusting that brightness control to full during the day and then back down to minimum at night. If you're doing this, you've got a bad photocell too. When everythings operating normally, you should never have to touch the brightness control on a MKIV once you've got it adjusted to a comfortable nighttime setting.

greetings guys, i have a 04 x5 3.0d sport, my screen doesnt light up, although everything is normal, it just that i cant see anything on the screen at night, and in daytime i have to look real close to see whats on it, also, brightness setting is set to maximum already, any advise on how to turn on the light? thanks for any advise.