2011 Toyota Avalon Owners Manual - Page 451

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 rag.) l Small Phillips-head screwdriver l Lithium battery CR1632 (vehicles with smart key system), CR2016 (vehicles without smart key system) n Replacing the battery (vehicles with smart key system) Take out the mechanical key. Remove the cover. 428 AVALON_U (OM41428U)