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My Acura has inputs for video on the DVD nav player. It displays whenever a signal is active. I tapped the reverse lights to supply power to the camera, which then sends the signal to the DVD player, which is then displayed.
No idea how the Prius is configured, but that would be the basic principle. The turn signal switch would connect a camera to power, which would then feed into the display input.
...easier to just put blind spot mirrors on the regular mirrors.
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