GM Service Manual Online
For 1990-2009 cars only

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

    • Audio System
    • Power Windows

The radio will work when the key is in ON/RUN or ACC/ACCESSORY. Once the key is turned from ON/RUN to LOCK/OFF the radio will continue to work 10 minutes or until the driver's door is opened. The power windows will continue to work for up to 10 minutes or until any door is opened.