TOYOTA 2013 Prius PHV - Manual (Page 374)

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2-3. Operating the lights and windshield wipers
PRIUS PHV_OM_OM47787U_(U)
NOTICE
■ When the rear window is dry
Do not use the wiper, as it may damage the rear window.
■
When the washer fluid tank is empty
Do not operate the switch continually as the washer fluid pump may over-
heat.