MG MG3 Owner's Handbook Manual page 134

Locking
Using the Remote Key
1 Close the doors and tailgate.
2 Press the lock button once. The direction indicator
lights flash three times to confirm that the car is
securely locked and the lock status alarm indicator
light starts to flash.
Using the Mechanical Key
1 Insert the mechanical key into the driver's door lock
and turn clockwise to lock all doors.
2 The direction indicator lights flash three times to
confirm that the car is securely locked and the lock
status indicator light starts to flash.
STARTING & DRIVING
Mislock
If the driver's door is not fully closed when the remote key
lock button is pressed or the mechanical key is used for
locking, none of the doors will be locked, and an audible
alarm will sound.
If the driver's door is closed but a passenger door or
tailgate is not fully closed when the remote key lock button
is pressed or the mechanical key is used for locking, all
closed doors will be locked, the open door or tailgate
will not be locked, the lock status indicator light will not
illuminate, and an audible alarm will sound.
Once the open door or tailgate is closed, the system will
enter locking status, and the lock status indicator light will
illuminate.
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