1. Turn your 740i's ignition on so that the engine is idling and on, the traction control will turn on automatically when the engine has been started.
2. Push the 'ASC+T/DSC' button below your radio to deactivate the traction control. An indicator lamp will light up on your dashboard to show that it has been deactivated.
3. Press the 'ASC+T/DSC' button again to re-activate and turn on the traction control.