2012 Toyota Yaris Owners Manual - Page 249

4-3. Do-it-yourself maintenance Type B Remove the cover. To prevent damage to the key, cover the tip of the screwdriver with a tape. To prevent the buttons from being disassembled, face the button surface downward. Remove the module. 4 Maintenance and care Open the case cover and remove the depleted battery. Insert a new battery with the "+" terminal facing up. 271