Volvo 2008 C30 Owner's Manual page 59

The cruise control buttons are located on the left side of the steering wheel hub.
1. Press the CRUISE button.
NOTE
This does not set the vehicle's speed.
2. Press + or - to set the current speed.
Increasing or decreasing speed
Use + or - in the following ways to increase or decrease the vehicle's speed:
1. Press and hold down + or - until the vehicle reaches the desired speed. This will become the set speed when the button
is released.
2. Press + or - for approximately a half second and release the button to increase or decrease vehicle speed by
approximately 1 mph (1.6 km/h).
NOTE
Cruise control will not function at speeds below 20 mph. (30 km/h).
Momentary acceleration, for less than 1 minute (e.g. when passing another car), does not affect cruise control operation.
The vehicle will automatically return to the previously set speed when the accelerator pedal is released.
Temporarily disengaging the cruise control
Press 0 to temporarily disengage cruise control.
CRUISE will appear in the function display. The currently set speed is stored in the system's memory.
Cruise control is also automatically disengaged:
If the speed drops below approximately 20 mph (30 km/h) when driving uphill.
When the brake or clutch pedal is depressed.
If the gear selector is moved to position N.
During wheel spin or wheel lock-up.
If the vehicle's speed is increased by using the accelerator pedal for more than 1 minute.
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02 Instruments and controls
CRUISE will appear in the function display in the center of the instrument panel.
CRUISE ON will be displayed.