Honda civic sedan 2016 Owner's Manual page 529

uuRemote Transmitter CareuReplacing the Button Battery
■
Smart Entry Remote
Battery
* Not available on all models
528
*
Battery type: CR2032
1. Remove the built-in key.
2. Remove the upper half of the cover by
carefully prying on the edge with a coin.
u Remove carefully to avoid losing the
buttons.
u Wrap a coin with a cloth to prevent
scratching the smart entry remote.
3. Make sure to replace the battery with the
correct polarity.