Audio Systems: stereo, bose systems, glove box

Question
how do i find the  factory amp in my 2002 avalanche? And which is the remote wire coming out of it??

Answer
factory amp is under the seat or right side of glove box
some bose systems have the amplifiers inside the doors

there is no remote wire or ignition wire, also no rca out or a way to install a hi low, with out
burning the radio , you need this to add aftermarquet amplifiers,

http://www.oemautosound.com/c-135-gm-chime-retention.aspx