I almost finished wiring Metra 70-1722 to my Pioneer FH-X720BT, there's one confusion here:
In Metra 70-1722, there's a Orange/Black wire (Pin #9 in below picture) for Negative Illumination:
View attachment 39570
However the Pioneer FH-X720BT does not have a matching wire for purpose, it only has an Orange/White (Pin #22 in below picture) to "Connect to a car’s illumination signal"
View attachment 39578
Should I leave Orange/Black of Metra 70-1722 open or should I connect it to some where else?
Thank you all pals!