Toyota 2015 Corolla Owner's Manual page 255

280
5-9. Bluetooth
When talking on the phone
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Do not talk at the same time as the other party.
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Keep the volume of the received voice down. Otherwise, voice echo will
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increase.
Automatic volume adjustment
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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.
Phone call system functions
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Depending on the cellular phone, certain functions may not be available.
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
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COROLLA_TMMMS_TMMC_U (OM12F00U)
®
Phone