Turn the knob to the position for 
(number plate lighting is switched on at the same time).
If the car's electrical system is in key position II or the engine is running then the daytime running lights are switched on instead of the front position lamps.
When it is dark outside and the boot lid is opened the rear position lamps illuminate to alert traffic behind. This takes place irrespective of what position the knob is in or what key position the car's electrical system is in.