GM Service Manual Online
For 1990-2009 cars only

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

    â€¢ Audio System
    â€¢ Audio Steering Wheel (if equipped)
    â€¢ Clock
    â€¢ Power Windows
    â€¢ Sunroof (if equipped)

Power to these accessories works up to 10 minutes or until the driver door is opened.

The instrument panel cluster lights stay on for a few seconds, then will go out. Once the driver door is opened, the power shuts off to these accessories. The vehicle has a feature designed to protect the battery against drainage. For more information see Inadvertent Power Battery Saver and Electric Power Management .