Honda Civic Service Manual: Battery System

Electrical

...

Battery Removal and Installation

Removal 1. Battery Terminal - Disconnection 1. Make sure the ignition switch is in LOCK (0). ...

See also:

Honda Civic Owners Manual. Phone Setup
To pair a cell phone (when there is no phone paired to the system)  Select Phone.  Select Yes.  Make sure your phone is in search or discoverable mode, then select Continue.  HFL automatically searches for a Bluetooth device.  Select your phone w ...