If you want to do the wiring inside the headlight, this is how it's done.
1) Locate the "black" wire that leads into the ballast.
2) Locate the "brown" wire that is connected to the halogen bulb
3) Using a "butt" connector, tap these 2 wires together. Tap them as close as you can towards the main connector (gives you enough slack if you need to every change your halogen bulb)
Here is how I did it,
This will allow the lowbeam xenon light's to turn on.