I've got a mystery button on my new 5 series BMW. It reads START/STOP
The START but works but the STOP bit is a total mystery
I ended up earlier tonight pushing the damn thing 4 times to both turn the engine off and then the radio
As long as you don't try using it to slow down Stewart.....you'll find a pedal thingy on the floor for that! You'll soon get the hang of things.