How to install fash2pass?

[jpdp]

Hi,
I have recently purchased an X5 with Xenon lights.
Previously on my 3 series wagon, I had a flash2pass installed which would allow me to open the garage door with a double flash of the high beams.

When I opened the bonnet (hood) I noticed that I am going to have a hard time finding the wires, the brown and brown with a white stripe to tap into.

Anyone done this and know how to do it easily. I am thinking that I need to take a cover off under the front wheel well.
I have a 40d, if that matters from an engine point of view.

Thanks,
Jp.