TOYOTA 2010 Sienna - Manual (Page 326)

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3-3. Using the rear audio system
NOTICE
■
For normal operation after replacing the battery
Observe the following precautions to prevent accidents.
●
Always work with dry hands.
Moisture may cause the battery to rust.
●
Do not touch or move any other components inside the remote controller.
●
Do not bend either of the battery terminals.