I did a pre-lci halogen to pre-lci xenon conversion.
Full details can be found here
http://www.e90post.com/forums/showthread.php?t=912413
Your xenons aren't lighting up because you need an extra earth wire.
The genuine BMW aftermarket wiring harness has this.
Or you could bridge pins 2 and 4 in the headlight socket.
Cheers