(Help) 19 Silverado tapping into Bose amp

[JimmyB1217]

Hi guys so I’ve searched absolutely everywhere and cannot for the life of me find info on how to tap into the Bose factory amp that is located behind the rear seats. I am looking to install a line output converter and would just like some guidance on which wires to cut into. Thanks in advance. -Jim

[Mountain boy]

Under the passenger kick panel remove the door plate and under in the bundle there is a twisted pair yellow and yellow brown. That is where you tap in to connect the factory sub. It is a high level output 

[Dexter Jensen]

Did you take any pictures. I cannot find them