What does it mean when a car is unlocked?

[VanSawyer]

It indicates that some doors are not locked properly. Simply get out of the car and lock all doors securely, and the 'car unlocked' warning will disappear. Here is relevant information about the car not auto-locking: 1. Malfunction in auto-locking feature: If the car doesn't auto-lock while driving, it means there's a malfunction in the auto-locking system that requires inspection at a 4S shop; 2. Lack of keyless entry system functionality: If the car doesn't auto-lock after parking, it means either the vehicle isn't equipped with a keyless entry system, or its auto-lock is a proximity sensor type that requires detection before activating the auto-lock function.