I'm planning on installing an 13.3" Android head unit. I have the JBL system, including the rear sub; the "Joying" unit asks if the FJ is with the JBL system or not. I'm not interested in the Joying but the one that I'm looking at doesn't ask if it's JBL. Is the wiring harness completely different with the JBL? Or would I simply need some sort of adapter? Thanks for the help.