GM Service Manual Online
For 1990-2009 cars only

The following vehicle accessories can be used for up to 10 minutes after the engine is turned off:

    • Audio System
    • Power Windows
    • OnStar® System (if equipped)
    • Sunroof (if equipped)

These features work when the key is in ON/RUN or ACC/ACCESSORY. Once the key is turned from ON/RUN to LOCK/OFF, the windows and sunroof continue to work up to 10 minutes until any door is opened. The radio continues to work for up to 10 minutes or until the driver door is opened.