audio question

Hello! this is my first post to this forum (or any for that matter) so please pardon me if I'm missing any kind of etiquette here. I just got a used car, a 2019 Buick Enclave, not the one with the Bose system. I have a 12" 4ohm Kicker comp-Q subwoofer and box from my last vehicle and I want to...

Does anyone know where the actual radio module is located. it is not directly behind the screen. i am looking to add an aftermarket amp and need the signal coming out of the radio to hook up LC7i line out converter. can not take signal from the speaker location because their is not a full range...