Toyota 2015 Prius Owner's Manual page 287

2-3. Operating the lights and windshield wipers
Rear window wiper and washer
Turning the end of the lever turns on the rear window wiper and
washer as follows:
Type A
PRIUS_OM_OM47A17U_DVD_(U)
Intermittent window
wiper operation
Normal window wiper
operation
Washer/wiper dual
operation
Washer/wiper dual
operation
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