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 switch to ON *1.
2. Turn on the audio system.
3. Press and hold the audio system power button for more than two seconds.
The audio system is reactivated when the audio control unit establishes a connection with the vehicle control unit. If the control unit fails to recognize the audio unit, you must go to a dealer and have the audio unit checked.
Honda Civic Owners Manual. Making a Call
You can make calls by inputting any phone
number, or by using the imported
phonebook, call history, speed dial entries, or
redial.
Making a Call
Any voice-tagged speed dial entry can be dialed by
voice from most screens.
Press the button and say
the voice tag name.
...