Toyota Venza 2011 Manual page 402

3-5. Using the hands-free system (for cellular phone)
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Automatic adjustment of volume
When vehicle speed is 50 mph (80 km/h) or more, the volume automatically
increases. The volume returns to the previous volume setting when vehicle
speed drops to 43 mph (70 km/h) or less.
■
When using a voice command
●
For numbers, say a combination of single digits from zero to nine, #
(pound),  (star), and + (plus).
●
Say a command correctly and clearly.
■
The system may not recognize your voice in the following situations:
●
When driving on a rough road
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When driving at high speeds
●
When air is blowing out of the vents onto the microphone
●
When the air conditioning fan emits a loud noise
■
The following cannot be performed while driving:
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Operating the system with
●
Registering a cellular phone to the system
■
Changing the passkey
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