ACC wire

I am installing an alarm remote start in a 2002 chevy silverado 2500HD.  The alarm diagram show wires going out the key cylinder to on, start, etc.

There is a wire going to ACC at the key cylinder.  I have three ignition wires that come on in the ON position.  two ignition ones and a third orange AC heating one.  There is also one that comes on when the car is in ACC position for radio and stuff.   My question is what wire do I connect the ACC from the alarm to?  Do I go to the third ignition, the brown wire for radio and stuff, or where?

Thanks