You could always "tap" into the rear speaker wires and connect them to a line out converter (converts speaker wires to RCA / low level outputs).
Im not real knowledgeable on the VE, but im fairly sure this method will work.
You'll also have to tap into the ACC wire of the head-unit or better yet the power antenna if possible. This wire goes to the "REM" input of your amplifier.
Im sure someone who's done a bit of work on the VEs will be able to shed more light and maybe provide diagrams (if they are in a good mood) lol.
By the way, what were you planning on running off this amp?