Honda 2016 Civic Coupe Owner's Manual page 129

uuLocking and Unlocking the DoorsuLocking/Unlocking the Doors from the Inside
■
Using the Master Door Lock Switch
To Unlock
Master Door
Lock Switch
128
Press the master door lock switch in as shown
to lock or unlock both doors.
To Lock
1Using the Master Door Lock Switch
When you lock/unlock either doors using the master
lock switch, both doors lock/unlock at the same time.