jvc yellow black wire

I have a 2007 VW Passat with a JVC stereo I installed in it several years ago. I also hooked up a changer, SIRIUS (JVC SIR-1) tuner and bluetooth adapter to it. These all sit under the driver's seat and all has been working great. I recently got a JVC KSSRA100 (along with a SIRIUSConnect tuner...