OK - I had a bit of a *EUREKA* moment this evening while studying the pin diagrams and my wiring harnesseseseseses.
My mistake is I used the basic Metra 70-7552 wiring harness. It doesn't have anything in pins 6, 15 and 16 which are the very pins the steering wheel controls are coming...
I *JUST* finished installing a Pioneer unit in my 2015 Leaf S yesterday.
Everything works with the exception, of course, of the Steering Wheel Controls.
I too wired in a ASWC-1 with the AX-NIS32SWC-6V harness but can't for the life of me get it to work.
I also made doubly sure to remove the BT...