Honda Civic Owners Manual: Key Types and Functions

Locking and Unlocking the Doors

...

Keys

Use the key to start and stop the engine, to lock and unlock the doors and to open the trunk. You can also use the remote transmitter or smart entry system* to lock and unlock the doors and to ...

See also:

Honda Civic Owners Manual. Childproof Door Locks
The childproof door locks prevent the rear doors from being opened from the inside regardless of the position of the lock tab. Setting the Childproof Door Locks Slide the lever in the rear door to the lock position, and close the door. When opening the door Open the door using the outsid ...