GM Service Manual Online
For 1990-2009 cars only

Your vehicle is programmed so that, when the doors are closed, the ignition is on, and the shift lever is moved out of (P) Park, all the doors will lock. The doors will unlock every time you stop the vehicle and move the shift lever into (P) Park.

If someone needs to get out while your vehicle is not in (P) Park, have the person use the manual lock knob or power door lock switch. When the door is closed again, it will not lock automatically. Use the manual lock knob or power door lock switch to lock the door.

If your vehicle has a Driver Information Center (DIC), you can choose various lock and unlock settings. For programming information, see DIC Vehicle Customization .