2011 Toyota Tundra Regular Cab Owners Manual - Page 398

3-3. Using the Bluetooth® audio system n When using a voice command For numbers, say a combination of single digits from zero to nine. Say the command correctly and clearly. n The system may not recognize your voice in the following situations: l When driving on rough roads l When driving at high speeds l When air is blowing out of the vents onto the microphone l When the air conditioning fan emits a loud noise n Operations that cannot be performed while driving l Operating the system with l Registering a portable player to the system n Changing the passkey →P. 378 372