How To Replace The Transmitter Battery

WARNING: This page is about a different car, the 2005 Mitsubishi Endeavor. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Do not allow water or dust to enter the inside of the transmitter when it is opened. Also, do not touch the precision electronic device.

Remove the set screw to remove the battery from the transmitter.

Fig 1: Removing Battery From Transmitter
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Install a battery with its (+) side face-down.
Battery required for replacement: Coin type battery CR2032
Insert the claw first, and reassemble the transmitter.
Verify that the keyless entry system operates.