AC wiring color needed

[240S15DETE6K]

I need to tap into the AC request coming out of the back of the dash controller. There are three plugs on the back of the unit, each with several wires. I need to find the wire that changes when the AC button on the front is pressed. I've measured each pin for a change in voltage or continuity to ground, but nothing seems to be effected by the button. Someone with a factory manual for a 240 please help. The signal probably goes to the ECU, so maybe you could look there for a AC request input?
Thanks,

[gfisch]

Couldnt tell you which one it is, but why dont you just trace the wire ack from the plug that goes into the button on the dash, or tap into it right up at that plug. Shouldnt matter where in the line you get to it.
Whadda ya need that for anyways??