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Those are connectors that attach to the factory wiring harness. Available at Best Buy or Amazon etc.

Your gonna have to remover the rear deck lid to tap the wiring. Thanks Toyota! I don't know the colors. But technically, if you did, you could tap them anywhere. I did everything at the head unit. Removed front and rear speaker wiring and installed RCA converter cables. Then ran RCA to my amps...

It's a separate connector from the power and front speakers.

There is an 8 pin connector on the back of the head unit. Should be 5 wires in use. The single wire in the center is a ground (pretty sure). Then you have 2 on the left and 2 on the right. Top left is rear -, bottom left is +, for left speaker. Top right is -, bottom right is +, for right...