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Originally Posted by rainmaker
Actually that switch, often referred to as the snow chain switch, allows the wheels to slip up to 60 km/h (~35 mph) or so. In other words, it prevents ASR from kicking in until that speed. Once you hit approx 60 km/h or approx 35 mph, ASR is on once again.
To check if it works, engage the switch and drive, the light should go off around 35 mph...
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Just to clarify -- it does not actually completely defeat the ASR system under speeds of 35 mph. ASR will still engage at lower speeds with the switch ON (but the ASR system will allow more than usual wheel slip before it engages).