![P5-1617-S90 V90 Windshield wipers and washers](https://www.volvocars.com/images/support/img5729569efa0a1528c0a801527debe4a4_1_--_--_VOICEpnghigh.png?imwidth=1280)
The thumb wheel is used to set rain sensor sensitivity and interval wiper speed.
Single sweep
![P5-1507-Windshield Single sweep](https://www.volvocars.com/images/support/img264483e08d596edfc0a80152196ae9b9_1_--_--_VOICEpnghigh.png?imwidth=1280)
Move the lever down and release for a single sweep.
Wipers off
![P5-1507-Windshield wiper off](https://www.volvocars.com/images/support/imgf0e995368d594272c0a8015271972e28_1_--_--_VOICEpnghigh.png?imwidth=1280)
Move the lever to position 0 to turn off the windshield wipers.
Interval wipers
![P5-1507-Windshield, intermittent wiping](https://www.volvocars.com/images/support/imga31ae2c28d62c68cc0a8015270844c1c_1_--_--_VOICEpnghigh.png?imwidth=1280)
Move the lever upward to put the wipers in interval wiping mode. Set the number of sweeps per time unit with the thumb wheel when interval wipers are selected.
Continuous wipers
![P5-1507-Windshield continuous wiping 1](https://www.volvocars.com/images/support/imgeaf86a5a8d629a5dc0a8015274b2f03b_1_--_--_VOICEpnghigh.png?imwidth=1280)
Move the lever upward for the wipers to operate at normal speed.
![P5-1507-Windshield continuous wiping 2](https://www.volvocars.com/images/support/img6c72f0f68d626a68c0a801520398afb7_1_--_--_VOICEpnghigh.png?imwidth=1280)
Move the lever upward again for the wipers to operate at high speed.
Important
Before activating the wipers, make sure that the wiper blades are not frozen in place and that any snow or ice on the windshield and rear window has been scraped away.