Mitsubishi LANCER Owner's Manual page 117

Features and controls
Press the driver's door lock/unlock switch (A) to unlock only
the driver's door.
Within about 2 seconds, press the driver's door lock/unlock
switch (A) one more time to unlock all the doors.
3
NOTE
Settings can be changed so that all doors are unlocked
automatically by one press of the driver's door
lock/unlock switch (A).
Refer to "Setting of door unlock function" on pages 3-11
and 3-46.
3-22
Press the front passenger's door lock/unlock switch (A) to
unlock all the doors.
NOTE
If the doors are unlocked when all doors are locked and no
doors are opened within about 30 seconds, the doors will
automatically re-lock.
In cases such as the following, the F.A.S.T.-key does not
operate.
• A door is open or ajar
• The ignition switch is in a position other than "LOCK"
• The emergency key is inserted into the ignition switch