Volvo XC90 Owner's Manual page 107

Starting and driving
Starting the car
Autostart (V8 AWD)
Using the autostart function, the ignition key
does not need to be kept in the start position
(position III) until the engine has started. Turn
the ignition key to the start position and
release it. The starter motor then operates
automatically (up to ten seconds) until the
engine has started.
NOTE! Make sure the steering wheel locks
when you leave the car. This reduces the risk
of theft.
NMS