TOYOTA 2011 Yaris Sedan - Manual (Page 259)

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4-3. Do-it-yourself maintenance
Washer fluid
If any washer does not work or the low washer fluid warning light
comes on (if equipped), the washer tank may be empty.
Open the lid.
Add washer fluid.
NOTICE
■ When recharging the battery
Never recharge the battery while the engine is running. Also, be sure all
accessories are turned off.
CAUTION
■ When refilling the washer fluid
Do not refill the washer fluid when the engine is hot or running, as the
washer fluid contains alcohol and may catch fire if spilled on the engine etc.