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
Using the Remote Transmitter
Locking a Door Without Using a KeyHonda Civic Owners Manual. Playing Bluetooth’ Audio
Your audio system allows you to listen to music from your
Bluetooth-compatible
phone.
This function is available when the phone is paired and connected to the
vehicle’s
Bluetooth’ HandsFreeLink’ (HFL) system.
Phone Setup
Playing Bluetooth’ Audio
Not all Bluetooth-enabled phones ...