GMC 2010 Yukon/Yukon XL Owner's Manual page 337

The Bluetooth system uses voice recognition to
interpret voice commands to dial phone numbers
and name tags.
Keep interior noise levels to a minimum.
The system may not recognize voice commands if
there is too much background noise.
A short tone sounds after the system
responds indicating when it is waiting for a voice
command. Wait until the tone and then speak.
Speak clearly in a calm and natural
voice.
When using the in vehicle Bluetooth system, sound
comes through the vehicle's front audio system
speakers and overrides the audio system. Use the
audio system volume knob, during a call, to change
the volume level. The adjusted volume level remains
in memory for later calls. To prevent missed calls, a
minimum volume level is used if the volume is turned
down too low.
Use the buttons located on the steering wheel to
operate the in vehicle Bluetooth system. See Audio
Steering Wheel Controls on page 4 136 for more
information.
Press to answer incoming calls,
to confirm system information, and to start speech
recognition.
call, or to cancel an operation.
A Bluetooth enabled cell phone must be paired to the
in vehicle Bluetooth system first and then connected
to the vehicle before it can be used. See the cell
phone manufacturers user guide for Bluetooth functions
before pairing the cell phone. If a Bluetooth phone
is not connected, calls will be made using OnStar
Hands Free Calling, if available. Refer to the OnStar
owner's guide for more information.
Press to end a call, reject a
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