Volvo 2008 C30 Owner's Manual page 57

When the lever has been pulled, high pressure jets mounted in the bumper will spray the headlights.
The following applies to conserve washer fluid (see page 58 for information on the light switch positions):
Low/high beam headlights on
The headlights will be washed the first time the windshield is washed. Thereafter, the headlights will only be washed once
for every five times the windshield is washed within a 10-minute period.
64
02 Instruments and controls
Right-side steering wheel lever
Parking lights on
Optional Bi-Xenon® headlights will be washed once for every five times the windshield is washed.
Normal halogen headlights will not be washed.
B - Rain sensor (option)
The rain sensor automatically regulates windshield wiper speed according to the amount of water on the windshield. The
sensitivity of the rain sensor is adjusted by moving the thumb wheel (C in the illustration on the previous page) up (the
wipers will sweep the windshield more frequently) or down (the wipers will sweep the windshield less frequently).
On/Off
To activate the rain sensor:
1. Switch on the ignition.
2. Put the windshield wiper lever in position 0.
3. Press button B (see the illustration on page 63). The rain sensor symbol will appear in the lower display.
The rain sensor can be deactivated by:
Pressing button (B) with the ignition on.