Replace the battery with a new one if it is depleted.
You will need the following items:
Replacing the battery 1. Release the lock and remove the mechanical key. 2. Remove the key cover. To prevent damage to the key, cover the tip of the flathead screwdriver with a rag. 3. Remove the depleted battery using a small flathead screwdriver. When removing the cover, the electronic key module may stick to the cover and the battery may not be visible. In this case, remove the electronic key module in order to remove the battery. Insert a new battery with the "+" terminal facing up. 4. When installing the key cover and mechanical key, install by conducting 2 and 1 with the directions reversed. 5. Operate the or switch and check that the doors can be locked/unlocked. ■When replacing the key battery Be careful not to lose the battery or any other small parts. ■Use a CR2032 lithium battery
■If the key battery is depleted The following symptoms may occur:
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Hybrid Vehicle Transaxle: Installation
INSTALLATION CAUTION / NOTICE / HINT CAUTION: The engine assembly with hybrid vehicle transaxle assembly is very heavy. Be sure to follow the procedure described in the repair manual, or the engine lifter may suddenly drop. PROCEDURE 1. INSTALL TRANSAXLE CASE PROTECTOR (a) Install the transaxle case ...