Toyota 2015 Prius Owner's Manual page 266

2-3. Operating the lights and windshield wipers
Type B
The rear window wiper and washer can be operated when
■
The "POWER" switch is in ON mode.
If no washer fluid sprays
■
Check that the washer nozzles are not blocked if there is washer fluid in the
washer fluid reservoir.
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Intermittent
wiper operation
Normal window wiper
operation
Washer/wiper
operation
Washer/wiper
operation
I n f o r ma t i o n P r o v i d e d b y :
window
dual
dual