GM Service Manual Online
For 1990-2009 cars only

This feature will allow the driver to delay the actual locking of the vehicle. It will not operate if the key is left in the ignition. See Lockout Protection for more information.

When the driver's power door lock switch or the transmitter lock button is pressed once, with the key removed from the ignition and the driver's door open, three chimes will be heard to signal the delay. The doors will not lock immediately. Five seconds after the last door has been closed, all of the doors will lock and the parking lamps will flash once. The horn will also chirp if the horn chirp feature is enabled. See DIC Operation and Displays for more information.

If a door is opened before the five seconds has elapsed, the doors will not lock until five seconds after all doors are closed.

If the power door lock switch or the transmitter lock button is pressed twice when leaving the vehicle, the doors will lock immediately.

If the power door unlock switch or the transmitter unlock button is pressed, the doors will unlock immediately and not lock automatically after the doors are closed.

This feature is turned on at the factory but may be turned off through the Driver Information Center (DIC).