Looks like pin B8 - dark green ckt # 50 is the A/C input signal for the ECM.
Like joe said, The connector may have the wire in it , or not. But you can add a wire and change the prom and youre there.
You can get a whole nother ECM with an A/C equpt cal pac allready in it as well.Probably from a salvage yard.
Fact is stranger than Fiction