Lexus GS 450h 2008 Owner's Manual page 310

3-4. Using the hands-free system (for cellular phone)
When using the hands-free system
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The audio system and voice guidance are 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 received 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 unsealed 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
Conditions under which the system will not operate
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If using a mobile phone that does not support Bluetooth
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If the mobile phone is switched off.
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If you are outside service range.
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If the mobile phone is not connected.
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If the mobile phone' s battery is low.
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Bluetooth antenna
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The antenna is built into the display. If the mobile phone is behind the seat or in the
console box, or touching or covered by metal objects, connection status may dete-
riorate.
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