2013 Nissan Pathfinder SL accessory line accessible in rear cargo?

I'm looking to find out if there is an accessory line available in the rear color gold of the Nissan Pathfinder. The Bose speaker system includes a subwoofer in the same area that has five lines connected to it - power, ground, and the other 3 are what I assume to be audio signal. The power is always hot and not tied to an accessory lead.

Is there any clarity on the other 3 lines that I can use to trigger an accessory? Or if there is another line in proximity to the cargo area that I can use for a trigger?

Thanks in advance