GM Service Manual Online
For 1990-2009 cars only

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

With the key out of the ignition and the driver's door open, pressing LOCK on the driver's power door lock switch will not immediately lock the other doors. Instead a seven second delay will start and three chimes will be heard. Seven seconds after the driver's door has been closed, all of the doors will lock and the parking lamps will flash. The horn will also chirp if the horn chirp feature is enabled. See "Programmable Horn Chirp" previously for more information.

If the driver opens another door before the seven seconds, the doors will not lock until seven seconds after the last door is closed.

Press LOCK twice on the power door lock switch on the driver's door to lock the doors without a delay or press the LOCK button on the remote keyless entry transmitter while all doors are closed.