Direct power stereo with toggle switch

[Bluevitz-rs]

Originally Posted by CoryM

I wasn't very clear: cut the acc wire and leave the harness side disconnected. Then splice connector side acc wire into batt wire so both wires get power from the battery. Will work fine unless the Yaris headunit does something unusual.

This will kill the battery. Even if you push the power button on the stereo to turn it off, it's still drawing power. The ACC wire is basically a remote power circuit to activate the internals of the stereo.