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According to the Bosch service system it's something like this:
The ASD system works up to approx 26 mph. It is designed for traction in snow and ice, rather than to improve traction round a track. Most of the time it does nothing, and the diff's natural LSD effect provides a small amount of lockup (10% I think?). When the computer detects the rear wheels turning faster than the front (i.e. wheelspin) it powers the asd pump which locks up the diff hydraulically. This locks up to 100%. I'm not sure if it happens instantly or slowly. My tests in the recent snow here in the UK seemed to show it took about 1-2 seconds to achieve 100% lockup - so the lockup obviously occurs relatively slowly, not instantaneously. Incidentally the ASD is great in snow. I went up the same hill in my 2.5-16 with ASD and my 2.0 auto without ASD. The 2.0 just sat at the bottom of the hill spinning one wheel, but the 2.5-16 crawled up like a spider.
When the asd is doing something, the light in the dash lights up. Above ~26mph, the light will light up but the asd does not actually do anything. It is just a warning sign then...
I have had mine light up at 70mph round bends.
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