Toyota Matrix 2009 Owner's Manual page 174

3-5. Using the storage features
Adjusting the cup holder to the size of the cups or drink-cans
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CAUTION
Items unsuitable for the cup holder
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Do not place anything other than cups or aluminum cans in the cup holders.
Other items may be thrown out of the holders in the event of an accident or
sudden braking and cause injury. If possible, cover hot drinks to prevent
burns.
When not in use
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Keep the rear cup holders closed.
Injuries may result in the event of an accident or sudden braking.
240
Remove the holder and change the
holder position.
Small size
Middle size
Large size
Cup holders