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. Audio System Theft Protection
The audio system is disabled when it is disconnected from the power source,
such as
when the battery is disconnected or goes dead. In certain conditions, the system
may display a code entry screen. If this occurs, reactivate the audio system.
Reactivating the audio system
1. Turn the ignition ...