Honda Civic 2016 Manual page 555

uuRemote Transmitter CareuReplacing the Button Battery
■
Keyless Remote
Battery
* Not available on all models
554
*
Battery type: CR2032
1. Remove the built-in key.
2. Remove the upper half by carefully prying
on the edge with a coin.
u Wrap a coin with a cloth to prevent
scratching the keyless remote.
3. Make sure to replace the battery with the
correct polarity.