Toyota 2012 Rav4, Owner'S Manual, Page: 305 / 529

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3-2. Using the audio system
Adjusting the ringtone volume when receiving a call
Change the ringtone volume using .
To decrease the volume: Turn counterclockwise.
To increase the volume: Turn clockwise.
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When talking on the phone
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Do not talk simultaneously with the other party.
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Keep the volume of the received voice down. Otherwise, voice echo will
increase.
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Automatic volume adjustment
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.
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Phone call system functions
Depending on the cellular phone, certain functions may not be available.
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Situations where 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