Toyota 2012 Matrix Owner's Manual page 234

3-3. Using the Bluetooth
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When using a voice command
For numbers, say a combination of single digits from zero to nine.
Say the command correctly and clearly.
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Situations where the system may not recognize your voice
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When driving on rough roads
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When driving at high speeds
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When air is blowing out of the vents onto the microphone
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When the air conditioning fan emits a loud noise
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Operations that cannot be performed while driving
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Operating the system with
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Registering a portable player to the system
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Changing the passkey
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audio system