See also:

Volvo XC90 Owners Manual
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Rain sensor
The rain sensor automatically regulates wiper speed according to the amount of water on the windshield. The sensitivity of the rain sensor can be adjusted moving the thumb wheel up (the wipers w ...

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 ...