GMC 2010 Yukon/Yukon XL Owner's Manual page 299

This feature allows you to select the volume level of the
chime.
Press the customization button until CHIME VOLUME
appears on the DIC display. Press the set/reset button
once to access the settings for this feature. Then press
the customization button to scroll through the following
settings:
The chime volume will be set to a normal
level.
The chime volume will be set to a loud level.
No change will be made to this feature.
The current setting will remain.
There is no default for chime volume. The volume will
stay at the last known setting.
To select a setting, press the set/reset button while the
desired setting is displayed on the DIC.
If your vehicle has this feature, it allows you to select
whether or not the outside mirror(s) will automatically
tilt down when the vehicle is shifted into R (Reverse).
See Park Tilt Mirrors on page 3 57 for more
information.
Press the customization button until PARK TILT
MIRRORS appears on the DIC display. Press the
set/reset button once to access the settings for this
feature. Then press the customization button to scroll
through the following settings:
Neither outside mirror will be tilted down
when the vehicle is shifted into R (Reverse).
The driver's outside mirror will be
tilted down when the vehicle is shifted into R (Reverse).
mirror will be tilted down when the vehicle is shifted into
R (Reverse).
The driver's and passenger's outside
mirrors will be tilted down when the vehicle is shifted
into R (Reverse).
No change will be made to this feature.
The current setting will remain.
To select a setting, press the set/reset button while the
desired setting is displayed on the DIC.
The passenger's outside
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