Volvo 2007 C70 Owner's Manual page 56

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.
61
02 Instruments and controls
Right-side steering wheel lever
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 the previous page). The rain sensor symbol will appear in the lower display.
The rain sensor can be deactivated by:
Pressing button (B) with the ignition on.
or
Moving the windshield wiper lever down. If the lever is moved up, the rain sensor function will remain activated
CAUTION
The rain sensor should be deactivated when washing the car in an automatic car wash, etc. If the rain sensor function
is left on, the wipers will start inadvertently in the car wash and could be damaged.
C - Thumb wheel