GM Service Manual Online
For 1990-2009 cars only

These vehicle accessories may be used for up to 10 minutes after the ignition key is turned to the LOCK position:

    â€¢ Outside Mirror
    â€¢ Power Windows
    â€¢ Sunroof (if equipped)
    â€¢ Radio

The outside mirror, power windows and sunroof will function until a door is opened.

The radio will function until the driver door is opened.