Harness connection ID/Digital dash/AC

[N2BUICK]

Still trying to energize a digital dash and digital hvac control.
Found the harness, have dash, and digital HVAC controller, all loose no car.
I have located the dash plug in connector. What I'm having issue is which connectors on the harness go to the HVAC controller.
There are two that have the correct type plug but nothing is making sense. Was there an intermediate harness between the under dash harness and the HVAC controller?
It's been to many years since I removed these items from the ttype.

 

[pacecarta]

looks like there is

 

[N2BUICK]

Thanks for that info. I problem have that in the service manuals.
I'm still lost in the woods. Sending a Pic of three connectors that would be possible. Trying to find if it is the correct section of loom.
Note the harness is from an 1987, not sure the year of the hvac control.
The plastic cover being removed from the control is confusing.

 

[N2BUICK]

What is a good way to tell I do or don't have a digital wire harness, is the better question