Anyone tried this keyless entry one-button alarm mod on a MY06 WRX?

I'm finding two wires in the IU harness that respond to the keyfob open button. One is black/green and one is green/black. The problem is that both respond to both single- and double-click. In fact I'm not finding any response difference between them, and I'm not finding any other wire in the harness responding to the keyfob.

Anyone tried this or have any ideas?

[more info: they along with what i believe is the IU power wire all enter the fuse block in the same harness]

thanks all,