Using the rear window wiper/washer
The rear window washer/wiper is designed to clean the rear window. Use the right-side steering wheel lever to start and control the wiper/washer.
Activating the rear window wiper/washer
Select 
for interval rear window wiper.
Select 
for continuous rear window wiper.
Move the right-side steering wheel lever forward to wash/wipe the rear window.
Automatic rear window wiping when backing up
If reverse gear is engaged while the windshield wipers are on, the rear window wipers will start. This function is deactivated when a different gear is selected.
Contact an authorized Volvo workshop to deactivate the function.
Note
At low ambient temperatures, the automatic rear window wiper when backing up is switched off to help prevent damage to the wiper arm.