DoorsDoors  - Locking and unlocking - Mitsubishi Lancer Owner's Manual - Mitsubishi Lancer

► Make sure the doors are closed: driving with doors not completely closed Caution

► Make sure the doors are closed: driving with doors not completely closed is dangerous.
► Never leave children in the vehicle unattended.
► Be careful not to lock the doors while the key is inside the vehicle.

► To prevent the key from being locked inside the vehicle, neither the lock knob Note

► To prevent the key from being locked inside the vehicle, neither the lock knob on the driver’s door nor the key or the central door lock switch (vehicles equipped with central door lock switch) can be used to lock the driver’s door when it is open.

See also:

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Door ajar warning display screen (when the ignition switch is “ON”)
If any of the doors or the rear hatch is not completely closed, this displays the open door or rear hatch. If the vehicle speed exceeds approximately 8 km/h (5 mph) while a door is ajar, a buzz ...