Toyota Avalon 2008 Quick Reference Manual page 255

3-3. Using the hands-free system (for cellular phone)
Automatic adjustment of volume
n
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
n
l For numbers, say a combination of single digits from zero to nine, #
(pound), ∗ (star), and + (plus).
Say a command correctly and clearly.
l
The system may not recognize your voice in the following situations:
n
When driving on unsealed roads
l
When driving at high speeds
l
If the window is open
l
l If the air conditioning is blowing directly on the microphone
If the air conditioning is set too high
l
The following cannot be performed while driving:
n
Operating the system with
l
Registering a cellular phone to the system
l
Changing the passkey
n
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