GM Service Manual Online
For 1990-2009 cars only

With the delayed locking feature, the doors will not lock immediately when locking the doors using the power door lock switch or when LOCK on the remote keyless entry transmitter is pressed while any door is open. Instead, three chimes will be heard to indicate that the delayed locking feature is in operation. Five seconds after all doors are closed, the doors will lock automatically.

If the ignition is in ON or ACCESSORY, this feature will not lock the doors.

If your vehicle is equipped with the Driver Information Center (DIC), see DIC Vehicle Personalization to program the delayed locking feature.