Acura MDX Owner's Manual page 433

uuRemote Transmitter CareuReplacing the Button Battery
Models with remote control engine start system
If the indicator does not come on when the button is pressed, replace the battery.
Battery
432
Battery type: CR2032
1. Remove the built-in key.
u As a convenience, lightly place masking
tape over the remote buttons to hold
them in place.
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 transmitter.
3. Press down on the center of the assembly
and remove the battery.
u When removing the button battery, be
careful not to touch parts around it.
4. Make sure to replace the battery with the
correct polarity.
1Replacing the Button Battery
Models with remote control engine start system
NOTICE
The Remote transmitter is equipped with two
batteries: A standard replaceable CR2032 coin
button battery and an integral non-replaceable
rechargeable battery. To prevent permanent damage
to the rechargeable battery, replace the CR2032
battery every three to four years.