Toyota PRIUS Manual page 415

 Operation signal (s)
For Europe
The emergency flashers flash once to indicate that the system has been
turned on.
For Australia and New Zealand
The buzzer sounds and/or the emergency flashers flash to indicate that the
system has been turned on/off.
The system turned on: The buzzer sounds once and the emergency flashers
flash once.
The system turned off: The buzzer sounds twice.
 Operating conditions
The system will only operate if all of the following conditions are met:
 The shift position is in P.
 The "POWER" switch is OFF.
 All doors are closed.
 The hood is closed.
 The brake pedal is not being depressed.
 When leaving the vehicle
 Check that the headlights are switched to either off or "AUTO".
 Check that the wiper switch is turned off.
 Check that all windows are closed.
PRIUS PHV_OM_OM47831E_(EE)
3-1. Using the air conditioning system and defogger
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