Toyota 2012 Prius Owner's Manual page 24

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Changing "POWER" switch modes
Modes can be changed by pressing the "POWER" switch with the
brake pedal released. (The mode changes each time the switch is
pressed.)
PLUG-IN QG_U (OM47747U)
3. Basic operation
Off
The emergency flashers can be
used.
ACCESSORY mode
Some electrical components such
as the audio system can be used.
The "POWER" switch indicator
turns amber.
ON mode
All electrical components can be
used.
The "POWER" switch indicator
turns amber.
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