Cadillac CTS 2008 Owner's Manual page 220

Chime Volume
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 menu up/down button to scroll through the following
settings:
Normal: The chime volume will be set to a normal level.
Loud: The chime volume will be set to a loud level.
No Change: 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.
Park Tilt Mirrors
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 REVERSE (R).
See Park Tilt Mirrors on page 2-51 for more information.
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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 menu up/down button to scroll through the following
settings:
Off (default): Neither outside mirror will be tilted down
when the vehicle is shifted into REVERSE (R).
Driver Mirror: The driver's outside mirror will be tilted
down when the vehicle is shifted into REVERSE (R).
Passenger Mirror: The passenger's outside mirror
will be tilted down when the vehicle is shifted into
REVERSE (R).
Both Mirrors: The driver's and passenger's outside
mirrors will be tilted down when the vehicle is shifted into
REVERSE (R).
No Change: 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.