See also:

Symbols and messages in the display
...

Setting a time interval
Controls and display 3 - Time interval: Increase/decrease 6 - Time interval: On, while it is being set 7 - Time interval: On, after it has been set Press to increase the interval or to decrea ...

Accessory installation
We strongly recommend that Volvo owners install only genuine, Volvo-approved accessories, and that accessory installations be performed only by a trained and qualified Volvo service technicia ...