Anti-Lockout feature
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Leaving the key in the ignition with any door open will disable the use of the power door locks and the Remote Keyless Entry (RKE) lock function.
The anti-lockout feature can be overridden by holding the lock switch in the LOCK position for more than 3 seconds.