2011 Toyota Yaris Owners Manual - Page 706

4 -3 . Do-it -yourse lf m a int e na nc e Ke y bat t e r y 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. 284