Standard on all GTI's. You turn them on with the small round knob you use to adjust the door mirrors. If you look towrds the top of the dial there is a small screen type icon,turn the ''mark'' on the knob to the icon & they come on.Don't leave them on or they will burn out.
You know what, I feel such an idiot.
From my driving position, I can not see that icon on the top of it, as the knob gets in the way. So when I posted this, I'd never noticed this before!!!
Now I know its there I guess I can test it in the morning!
This morning it must have been the sun angle that melted one of them but not the other, so maybe it's not even broken!!! Just never been turned on!