Rear red and clear lense lights - each side

I have a 2011 625i.
The lights rocker switch on the dash board has 2 positions.
1 position for the rear red running lights to turn on.
The 2nd position is for the headlights to come on with
the rear red running lights.
There is also a clear panel underneath each red rear
light plastic panel.
There are 2 bulbs behind each of these more or less
clear lenses each side.
1 bulb is clear in color and the 2nd bulb has a brown tint to it.
How do I turn these lights on?
They don't seem to work while in reverse....unless this circuit
is broken?

Help.

Rob