Volvo XC 90 Quick Manual page 28

USING THE WIPERS AND RAIN SENSOR
The wipers and rain sensor are controlled from the right steering wheel
lever.
Move the lever down and release it for a single sweep.
Move the lever to position 0 to turn off the windshield
wipers.
Move the lever to INT (interval). Set the interval speed by
moving the thumb wheel on the lever up or down.
Move the lever up for the wipers to operate at normal speed.
Move the lever up to the next position for maximum wiper
speed.
Press the button to activate/deactivate the rain sensor. Turn
the thumb wheel on the lever for higher/lower sensitivity.
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Pull the right-side steering wheel lever toward the steering
wheel to start the windshield and headlight washers.
Push the right-side steering wheel lever forward to start the
tailgate wiper/washer.
Press for tailgate interval wiper.
Press for tailgate continuous wiper.