Toyota Avalon Hybrid 2018 Owner's Manual page 427

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When recharging or replacing the 12-volt battery
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In some cases, it may not be possible to unlock the doors using the smart
key system when the 12-volt battery is discharged. Use the wireless remote
control or the mechanical key to lock or unlock the doors.
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The hybrid system may not start on the first attempt after the 12-volt battery
has recharged but will start normally after the second attempt. This is not a
malfunction.
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The power switch mode is memorized by the vehicle. When the 12-volt bat-
tery is reconnected, the system will return to the mode it was in before the
12-volt battery was discharged. Before disconnecting the 12-volt battery,
turn the power switch off.
If you are unsure what mode the power switch was in before the 12-volt bat-
tery discharged, be especially careful when reconnecting the 12-volt battery.
WARNING
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Avoiding 12-volt battery fires or explosions
Observe the following precautions to prevent accidentally igniting the flam-
mable gas that may be emitted from the 12-volt battery:
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Make sure each jumper cable is connected to the correct terminal and that
it is not unintentionally in contact with any other than the intended terminal.
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Do not allow the other end of the jumper cable connected to the "+" termi-
nal to come into contact with any other parts or metal surfaces in the area,
such as brackets or unpainted metal.
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Do not allow the + and - clamps of the jumper cables to come into contact
with each other.
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Do not smoke, use matches, cigarette lighters or allow open flame near
the 12-volt battery.
7-2. Steps to take in an emergency
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