Thanks for the pic.
Well it's bi-xenon so it must have a "shutter". When you flick to high beams, the shutter opens and lets more light out, basically changing the cut off of the D1S to allow more light out, thus becoming the "high beam".
See here:
Now I don't know in your pic if that arrow is the shutter, or some other thing, but it must have a shutter.
What's the Red wire in the bottom of your pic for?
You said you could tap the high beam and low beam wire? Do you mean Shutter wire and Low beam wire?
If you tap the shutter and low beam wires, won't every time your low beams come on, the shutter will open?
You will want to tap the shutter wire to the high beam cable from the FRM Footwell module somehow.