Im not sure, but part of the control unit it at top of engine bay to left side of engine block, the previous owner to me took it in to local indi by him and plug was loose, they pushed it in and was ok for few weeks, now its back but plug is solid ( Im going on what the previous owner said - only had it few weeks) he made me aware there could be a prob with it before sale!!
Google / forum search suggest its a common fault that the sensor breaks down,you have to drop break fluid to change it im told!
Hopefully it will sort itself out in yours but defo think mine needs new sensor prior to winter setting in.
***** remember when the lights are lit the dsc in malfunctioning, :evil: so be mindful when accelerating and on twisty roads etc, that BMW is not there to save your arse or you could pay the ultimate price, and end up sideways *****