Volvo 2010 S80 Owner's Manual page 81

Functions with timer
The audio system can be operated without a
key for 15 minutes at a time by pressing the
POWER button. The power windows work for
several minutes after the key has been
removed, although not after the door has been
opened.
NOTE
Use the POWER button for the audio sys-
tem when the engine is not running to avoid
discharging the battery.
03 Your driving environment
Ignition modes
03
81