Toyota 2012 Avalon Owner's Manual page 485

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Stopping the engine
Shift the shift lever to "P" and press the "ENGINE START STOP" switch as
you normally do when stopping the engine.
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Replacing the key battery
As the above procedure is the temporary measure, it is recommended that
the electronic key battery be replaced immediately when the battery
depletes. (→P. 440)
5-2. Steps to take in an emergency
I n f o r ma t i o n P r o v i d e d b y :
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