Toyota 2009 Yaris Hatchback Owner's Manual page 285

4-3. Do-it-yourself maintenance
If the key battery is discharged
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The following symptoms may occur.
l The wireless remote control will not function properly.
The operational range is reduced.
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Use a CR2016 lithium battery
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Batteries can be purchased at your Toyota dealer, jewelers, or camera
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stores.
Replace only with the same or equivalent type recommended by your
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Toyota dealer.
Dispose of used batteries according to the local laws.
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CAUTION
Removed battery and other parts
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Keep away from children.
These parts are small and if swallowed by a child they can cause choking.
NOTICE
For normal operation after replacing the battery
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Observe the following precautions to prevent accidents.
l Always work with dry hands.
Moisture may cause the battery to rust.
l Do not touch or move any other components inside the remote control.
Do not bend either of the battery terminals.
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