TOYOTA 2011 Yaris Hatchback - Manual (Page 297)

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4-3. Do-it-yourself maintenance
Key battery
Replace the battery with a new one if it is discharged.
n You will need the following items:
l Flathead screwdriver (To prevent damage to the key, cover
the tip of the screwdriver with plastic tape.)
l Lithium battery CR2016
n Replacing the battery
Remove the cover.
Remove the module.
Remove the battery cover and
the depleted battery.
Insert a new battery with the
“+” terminal facing up.