Lexus 2012 RX450h Owner's Manual page 644

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3-4. Using the audio system
Automatic volume adjustment
When vehicle speed reaches 50 mph (80 km/h) or more, the volume automati-
cally 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 the command correctly and clearly.
Situations in which the system may not recognize your voice
When driving on rough roads
When driving at high speeds
When air is blowing out of the vents onto the microphone
When the air conditioning fan emits a loud noise
Operations that cannot be performed while driving
Operating the system using
Registering a mobile phone to the system
Changing the passkey
P. 653
644

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