2008 toyota tacoma

Hello,  I just purchased a new Sony stereo , mounting hardware, and vehicle wire harness.  I have a  2008 TOYOTA TACOMA RUGGED TRAIL ACCESS CAB. Factory stereo is just on disc and i do believe there is no amp...at least the sound does not seem to be amped.  but i have been known to be wrong.

Any information on the Factory wiring will help.  I did not even attempt to install yet because i have tweeters on door rails two front door speakers and 2 rear door speakers. and i wanted to make sure i wired the tweeters correctly or if they were filtered somewhere and i would not have to worry about them.

CDX 720 is the headunit i purchased if that is need.

Any help will be appriciated  thanks

	Battery		BLUE / YELLOW		(+)		RADIO HARNESS
	Accesory		GRAY		(+)		RADIO HARNESS
	Ground		BROWN		(-)		RADIO HARNESS
	Illumination		GREEN		(+)		RADIO HARNESS
	Amp Turn On
	LF Speaker (+)		RED
	LF Speaker (-)		GREEN
	RF Speaker (+)		BLACK
	RF Speaker (-)		WHITE
	Amp Location		BEHIND THE PASSENGER REAR SEAT

This is all the info from the Audiovox Tech website.