Turns the ASR (Anti Skid Regime - more than just traction control supposedly more like a limited slip diff and then some) off... means you have to concentrate on take off as no computer to throttle the engine back or brake any of the wheels in case of skidding/sliding. You can switch it off but it automatically comes back on the next time you re-start the engine (default setting is on). Turning it off all the time, with the Stilo's wonky back end, should assit you greatly in your quest to befriend a tyre dealer
Hmmm... has been a while since I read the handbook ASR does try hard to keep you on the road and going in the direction you wanna go. Tried it recently in the snow and ice (on purpose) by flooring accelerator whilst turning left into the business park where I work to find car will just run gently wide rather than get all bent out of shape (bent out of shape is reserved for braking hard on snow/ice with ABS )
The manual does say to turn it off during snow conditions as well.
Although ive left it on and tried flooring it, and it just cuts the power, but I think they say to turn it off for safety, as if the system finds traction when your doing that, its going to put the power back on and fly off