If the keyless remote battery or the vehicle battery is dead, use the key instead of the keyless remote.
Fully insert the key and turn it.
Locking/Unlocking the Doors Using a Key
When you lock the driver’s door with a key, all the other doors lock at the same time. When unlocking, the driver’s door unlocks first. Turn the key a second time within a few seconds to unlock the remaining doors.
Models with driver information interface
You can customize the door unlock mode setting.
Customized Features
Honda Civic Owners Manual. Security System Alarm
The security system alarm activates when the trunk, hood or doors are
forcibly
opened. The alarm does not go off if the trunk or doors are opened with the key,
remote transmitter or smart entry system*.
However, the alarm activates if a door is opened with the key and then the shift
lever
...