Cadillac 2011 DTS Owner's Manual page 240

The default settings for the customization features were
set when your vehicle left the factory, but may have
been changed from their default state since then.
The customization preferences are automatically
recalled.
To change customization preferences, use the following
procedure.
1. Turn the ignition on and place the vehicle in
P (Park).
To avoid excessive drain on the battery, it is
recommended that the headlamps are turned off.
2. Press the customization button to enter the feature
settings menu.
If the menu is not available, FEATURE SETTINGS
AVAILABLE IN PARK will display. Before entering
the menu, make sure the vehicle is in P (Park).
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The following are customization features that allow you
to program settings to the vehicle:
This feature will only display if a language other than
English has been set. This feature allows you to change
the language in which the DIC messages appear to
English.
Press the customization button until the PRESS
DISPLAY IN ENGLISH screen appears on the DIC
display. Press the set/reset button once to display all
DIC messages in English.
This feature allows you to select the language in which
the DIC messages will appear.
Press the customization button until the DISPLAY
LANGUAGE screen 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:
All messages will appear in
English.
All messages will appear in German.
All messages will appear in French.
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