Honda Civic Owner's Manual page 90

Remote Transmitter
Remote Transmitter Care
Avoid dropping or throwing the
transmitter.
Protect the transmitter from
extreme temperature.
Do not immerse the transmitter in
any liquid.
If you lose a transmitter, the
replacement needs to be
reprogrammed by your dealer.
86
Replacing the Transmitter Battery
If it takes several pushes on the
button to lock or unlock the doors,
replace the battery as soon as
possible.
Battery type: CR1616
SCREW
To replace the battery:
1. Remove the screw at the base of
the transmitter with a small
Phillips-head screwdriver.
2. Separate the transmitter by prying
its middle seam with your
fingernail.