GM Service Manual Online
For 1990-2009 cars only

If you have a vehicle with a manual transaxle , the doors will automatically unlock when the ignition is turned off. The automatic unlock feature cannot be programmed.

If you have a vehicle with an automatic transaxle, it was programmed at the factory to unlock when the shift lever is moved to PARK (P). You can change when the automatic unlocking occurs through the Driver Information Center (DIC). See DIC Vehicle Personalization .