Pioneer AVIC-S2 - Manual (Page 13)

1.4 Turning Your Device On and Off
Press and hold the power button for at least 2 seconds to turn on and off your
device.
When you press the power button to turn off the unit, your device actually enters
into a suspend state and the system stops operating. Once you turn on the system
again, it resumes from the same screen you left off at.
1.5 Main Menu
The Main Menu is your starting place for various tasks. Tap a button to start a
task or open another menu.
You can access the Main Menu at any time by pressing the MENU button on
your device.
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