Lexus 2014 LX570 Owner's Manual page 615

When using the hands-free system
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The audio system is muted when making a call.
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If both parties speak at the same time, it may be difficult to hear.
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If the incoming call volume is overly loud, an echo may be heard.
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Try to face toward the microphone as much as possible when speaking.
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In the following circumstances, it may be difficult to hear the other party:
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• When driving on unpaved roads
• When driving at high speeds
• If a window is open
• If the air conditioning is blowing directly on the microphone
• If the air conditioning is set to high
• There is an effect from the network of the cellular phone
Conditions under which the system will not operate
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If using a cellular phone that does not support Bluetooth
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If the cellular phone is turned off
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If you are outside service range
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If the cellular phone is not connected
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If the cellular phone' s battery is low
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When using the touch screen
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Dimmed screen buttons cannot be operated.
LX570_OM_OM60L21U_(U)
3-5. Using the hands-free system (for cellular phone)
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