TOYOTA 2010 Matrix - Manual (Page 155)

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2-3. Operating the lights and wipers
■ Light reminder buzzer
A buzzer sounds when the engine switch is turned OFF and the driver's door
is opened with the key removed from the engine switch while the lights are
turned on.
NOTICE
■ To prevent battery discharge
Do not leave the lights on longer than necessary when the engine is not run-
ning.