GMC Yukon Denali 2005 Manual page 19

Voice Volume
Selecting the Voice Volume screen button allows you to
adjust the volume of the voice guidance prompts that
provide various messages as you approach points
where you need to maneuver your vehicle, such as
an intersection.
To adjust the volume of the voice prompts you receive
from the system, do the following:
1. Touch the Voice Volume screen button.
2. Touch the plus (+) or minus (−) sign screen buttons
to increase or decrease the volume. The voice
prompt will come on with each adjustment to give
you an idea of the volume at each level.
3. Once you have reached the desired volume level,
touch the Back screen button to return to the
previous screen.
With Adaptive Voice Volume Control, the volume of
voice prompts will increase automatically once the
vehicle exceeds 50 mph (80 km/hr). Touch the On
screen button to activate this feature, or the Off screen
button to turn this feature off.
If you do not need voice guidance, you may also
choose to lower the volume until the voice guidance
prompts turn off by lowering Voice Volume as far
as it will go.
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