The dimmer is below the fog switch. Look on the other side of the head light switch. I'm not sure what it is.

BTW, speaking of headlights, the E70 has the best headlights I've ever seen. They are much better than the bi-xenons in my 9-3 convertible. A lot brighter and better reach. Also, about the cornering lights,I've seen them go on, but I can't figure out how they work. Are they located in the foglight housing?

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