head unit

I just had some general questions about updating my audio system. 1. I need to know whether or not I have bose installed, I understand if I do it will be more expensive and more complicated, but i honestly do not know how to tell if i do or not. 2. I know I need some kind of module to do...

I am currently in the process of installing a JVC KD-A525 head unit in my 2001 olds alero. Me, not thinking, did not decide to buy the wiring harness and decided to cut into the factory wiring harness to install the new head unit. Problem is, when I have my Constant 12V, illumination and all my...