Some vehicle accessories may be used after the ignition is turned off.
The power windows and sunroof, if equipped, will continue to work for up to 10 minutes or until any door is opened.
The infotainment system will continue to work for 10 minutes, until the driver door is opened, or until the ignition is turned on or placed in ACC/ACCESSORY.
Engine Heater
Shifting Into Park#13-00-89-003: Vehicle Software Enhancements - (Mar 27, 2013)
Subject:Vehicle Software EnhancementsModels: 2014 and Prior GM Passenger Cars and Light Duty Trucks The new technology systems on today’s vehicles may have software enhancements availableto add additional functionality after the vehicle is produced. To meet customer expectations,GM may make th ...