Toyota 2009 Tundra Owner's Manual page 515

4-3. Do-it-yourself maintenance
Washer fluid
Add washer fluid in the following situations.
l Any washer does not work.
l The low washer fluid warning light comes on. (if equipped)
l The warning message appears on the multi-information display. (if
equipped)
CAUTION
When refilling the washer fluid
n
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.
492
Open the lid.
Add washer fluid.