Ooh, LED DRL's as in fog lights. I got confused initially thinking that you were replacing the incandescent bulbs with individual LEDs.
If you want access to the parking light wiring without taking off the headlight lens, you will have to remove the bulb cover on the back and find the three wires leading towards the parking light.
I'm not sure if your '04 facelift wiring is the same as my '01 pre-facelift, but for me brown is ground, red is for the turn signal and green is for the parking light.
2001 Audi A6 2.8(ATQ) Quattro
Last edited by OGBULLYLOCDAWG; 11-12-2013 at 03:24 PM.