I've asked my VW to ask their engineers if they can change the DRL's to run on the fog lights instead of the side lights like a lot of other cars (Polo Bluemotion, Kia Picanto, etc) so hoping they can do it!
What you probably see, and MINI is the best example of this, Is DRL's that are built into the same area that houses the foglight. BUT they are not the intensity of a foglight. This is an important point. If you look at the latest MINI next time you see one you shall see the upper part of the foglight area is DRL and the lower section the foglight. Just to be a total nerd if you are getting confused!!
For this reason I suspect you will not be able to run DRL's through the fog unit on the up! as this is designed for the fog lights only. And the fact DRL's have to be a lower less intense light than fog lights. Edited by: MarkyMark