To lock without using the keyTo lock without using the key  - Doors - Locking and unlocking - Mitsubishi Lancer Owner's Manual - Mitsubishi Lancer

Set the inside lock knob (1) to the locked position, and close the door (2).

Set the inside lock knob (1) to the locked position, and close the door (2).

► The driver’s door cannot be locked using the inside lock knob while the driver’s Note

► The driver’s door cannot be locked using the inside lock knob while the driver’s door is opened.

    See also:

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    To lock
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    Interior
    1. Electric window control switch 2. Lock switch 3. Electric remote-controlled outside rear-view mirrors switch 4. Central door lock switch 5. Front room & map lamps 6. Sunroof switch ...