I am sure you guys get a lot of these questions, but I get a little confused when it comes to the wiring. I am installing a Kenwood KDC-342U http://www.kenwoodusa.com/UserFiles/.../kdcmp342u.pdf

In my 2010 Chevy Aveo, I have a wiring harness adapter that came with the unit. I also bought the GM18b wiring harness from Scorsche
http://www.amazon.com/SCOSCHE-GM18B-WIRING-HARNESS-CHEVROLET/dp/B004MNP3GC

as it says Aveo 2007 and up. Looking at the wiring diagram for the aftermarket radio it only mentions that there are four speaker wires. My Aveo has four speakers and the two tweeters in the pillars. I guess what I am asking is anyone can shed some light on the subject.