RCA Cable Location/ Hook-Up
 

Okay, so I am installing an aftermarket subwoofer in my BRZ. However, while installing this I realized that the BRZ OEM Nav does not have an RCA cable hook up in the back of it. Does anyone know if there is a wiring harness I can buy to hook it up to one of the plugs that are not being used by factory wires? I do not want to cut into any factory wiring. Also what color is the remote wire in the back of the nav?

Bumpp