Is there a chart somewhere that dictates what wires are positive and negative when it comes to the factory speakers?

The front left wires are purple and pink and the right front are blue and green.
The rears are like blacka dn white and 2 other colors are can't remember off hand.

Thanks

 

This may help.

http://www.installdr.com/Harnesses/Toyota-Wiring.pdf

 

Thanks. That saved me some time of putting a meter to the wires.