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. How the System Activates
The system becomes ready to start searching for lane markings when all the
following conditions are met:
The vehicle is traveling between about 45 and 90 mph (72 and 145
km/h).
The vehicle is on a straight or slightly curved road.
The turn signals are off.
The b ...