TOYOTA 2010 Matrix - Manual (Page 365)

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5-1. Essential information
Emergency flashers
NOTICE
■ To prevent battery discharge
Do not leave the emergency flashers on longer than necessary when the
engine is not running.
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.