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 outside door handle.
Childproof Door Locks
To open the door from the inside when the childproof door lock is on, put the lock tab in the unlock position, lower the rear window, put your hand out of the window, and pull the outside door handle.
Using the Master Door Lock Switch
Auto Door Locking/UnlockingHonda Civic Service Manual. Door Position Adjustment (4-door)
815325 LEFT FRONT
816330 RIGHT FRONT
821310 LEFT REAR
822310 RIGHT REAR
1.
Front Inner Fender As Needed
1.
Front door: Remove the front inner fender as needed (A).
2.
Front Fender Fairing
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