In order to remove the Headlight switch you first have to get to it...I am pretty sure you have to unbolt all the dash peices to do so..
anyways, once you have it removed (you will need a Torx screwdriver inorder to remove it)
unclip the all the wiring harnesses
remove the oem bulb from its housing (purple/black wire)
cut the purple wire and install a 470ohm resistor inline with the wire.
Then solder in an LED into the oem blub housing. (+/- to its proper side)
you will need to take apart the switch housing. pull on the oem headlight knob HARD...or use 2 a fork to lightly wedge it out. Or even better a Clip puller.
remove the black plastic ring..you will want to sand off the back of it..this will remove the green colored filter which is painted on..
reassmble and your good to go. you may need to adjust the leds angle to get proper lighting.
Expect a how to with pictures next week.