I think it‘s the colourcode like the old MINIs.
Blue/red and blue/white are driving light and highbeam, blackmails ground.
The red is parkinglight. And than there must be a bulbholder for the parkinglight. In some countries it isn‘t allowed to have four parkinglights. So if you got the lights at the wing they must cut the red wires in mainlamp.
It‘s easy to test, have a try.
Greets René
