The ignition switch must be in the ON position.

qRear WindowWiper

Turn the wiper on by turning the rear wiper/washer switch.

ON ― Normal.

INT ― Intermittent.

Rear WindowWasher

To spray washer fluid, turn the rear wiper/ washer switch to the position.
After
the switch is released, the washer will stop.

If the washer doesn't work, inspect the fluid level. If it's OK and the washer still doesn't work, consult an Authorized Mazda Dealer.