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 PARK (P), all the doors will lock. The front door inside handles will remain active. The doors will unlock every time you stop the vehicle and move the shift lever back into PARK (P).

If someone needs to exit the vehicle once the doors are locked, have that person use the manual lever or power door lock switch for the rear doors. The front doors will remain unlocked from inside the vehicle. When the door is closed again, it will not lock automatically. Use the manual lever or the power door lock switch to lock the door.

The power door locks can be programmed through prompts displayed on the Driver Information Center (DIC). These prompts allow you to choose various lock and unlock settings. For more information on programming, see DIC Vehicle Personalization .