Adding additional sub to jbl system?

Hey guys,

I have a amp/sub/wiring kit/line out converter that was in my Titan with the premium Rockford(a million times better than the jbl)

Has anyone simply added a sub to their system and know which wires are which coming out of the factory amp? I can’t seem to find a diagram for the 2015 models.

Any help would be great!!!

 

All data.com will have the info you seek or you can try calling Crutchfield , they will probably know. I did the same thing in my 2012 crewmax with jbl. The stock wires at factory sub are white+ and blue -....I just tapped into that to get a signal

 

I have a nice kicker compRT 8" for sale. Fits in the stock JBL system box and sounds better than stock
https://www.tundras.com/threads/kicker-comprt-8-subwoofer-85-shipped.38803/