I have confirmed the in cabin fuses are all intact and do not show any sign of issue. I have reviewed video and feel good about the black/slate wire being explained as the activation wire. This explains why previously someone used a jumper to it.

The video suggests that the DME may not be sending signal and the aux fan is not turning on. My aux fan does turn on anytime the vehicle is started. Not sure if that is a symptom or issue? Note it is around 80 degrees or higher outdoors when testing. I have not checked the heater control unit IHKA. This panel does control the hvac and does work when jumper is removed to control heat and blower functions. Just not sending signal maybe to AC compressor. I will review this as possible issue. The video comments the author also suggested "Hello, Check fuse 9 and fuse 20 which should be the main power supply to the IHKA. It would be worth taking it out as well and check the connections and power supply. Let me know if you need a wiring diagram."

Thank you for the video and the comments. I will report when test complete after I return home today.