Cadillac 2006 XLR - Manual (Page 145)

Be sure to continue scanning your displays, controls
and driving environment just as you would in a vehicle
without HUD. If you never look at your instrument
panel cluster, you may not see something important,
such as a warning light. Under important warning
conditions, the CHECK GAGES message will display in
the HUD. View your Driver Information Center (DIC)
for more information.
The HUD controls are
located to the left of the
steering wheel.
+
!
- (Brightness): This button is used to adjust the
brightness of the HUD and the instrument panel cluster.
DIMMER: This button is used to select the HUD or
the instrument panel cluster to adjust the brightness.
HUD: This button is used to adjust the vertical position
of the HUD display.
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