Yup. A4 and A7. Use a meter, you should have battery voltage on A4 all the time, A7 switches with the key.

A5 feeds the power amp and antenna preamp and will go high when the radio is on and key is on. That is the output to the amp you are probably missing.

Just a thought: I have no patience for these aftermarket harnesses. Waste of time, IMO. Get the diagram from the new radios' manual and the car's wiring diagram and match up lead-for-lead, make a diagram and then do the wiring using your diagram. That's what I do. Again, if you expect ANY harness to be "plug and play" you will never get this working.