Honda Pilot Owner's Manual page 154

Remote Transmitter
Replacing the Transmitter
Battery
If it takes several pushes on the
button to lock or unlock the doors
and the tailgate, replace the battery
as soon as possible.
Battery type: CR1616
150
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.
2009 Pilot
BATTERY
3. Inside the transmitter, separate
the inner cover from the keypad
by releasing the two tabs on the
cover.