the c2r-chy is overkill for just an amp and subs. you didn't mention if
you have 6 or 8 speakers. If it's the 6 speaker system, just connect
your LOC to the rear speakers to get a signal for your amp.
Use the fuse tap on fuse 35 in the fuse box in the trunk for the remote
signal.
now if you are planning a total system redo where you want to run
your own main speakers, the c2r-chy would be perfect. You don't have
to tap fuse 35 because a remote turn on is provided with the c2r.