Toyota 4runner 2010 Instruction Manual page 387

Automatic volume adjustment
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When vehicle speed reaches 50 mph (80 km/h) or more, the volume auto-
matically 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.
Situations that the system may not recognize your voice
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When driving on a rough road
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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 cellular phone to the system
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Changing the passkey
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→P. 399
3-4. Using the hands-free phone system (for cellular phone)
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