TOYOTA 2010 Prius - Manual (Page 508)

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5-1. Essential information
Emergency flashers
NOTICE
■
To prevent 12 volt battery discharge
Do not leave the emergency flashers on longer than necessary when the
hybrid system is not operating.
Use the emergency flashers if the vehicle malfunctions or is
involved in an accident.
Press the switch to flash all
the turn signal lights. To turn
them off, press the switch
once again.
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