Toyota FJ cruiser 2013 Owner's Manual page 416

4-3. Do-it-yourself maintenance
Key battery
Replace the battery with a new one if it is discharged.
You will need the following items:
■
● Small Phillips-head screwdriver
● Lithium battery CR2016
Replacing the battery
■
Remove the screw and cover.
Push the cover in the arrow
direction.
Remove the module.
Open the case cover using a
coin protected with tape etc.
and remove the depleted bat-
tery.
Insert a new battery with the
"+" terminal facing up.
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