See also:

Power-Up
After switching the ignition key from OFF to either the ON or ACC position, or after a language change, you must wait at least fifteen seconds prior to using the system. ...

Removing Key Fob From Ignition
Place the shift lever in PARK. Turn the Key Fob to the OFF position and then remove the Key Fob. NOTE: Power window switches will also remain active for up to 90 seconds after the ignition switc ...

Extreme Cold Weather (Below –20°F Or 29°C)
To ensure reliable starting at these temperatures, use of an externally powered electric engine block heater (available from your dealer) is recommended. ...