Cadillac 2010 STS Owner's Manual page 220

The Ignition is On and the HUD Image
Cannot Be Seen
Check to see if:
The HUD unit is covered.
The brightness is adjusted properly.
The HUD display is adjusted to the proper height.
Ambient light in the direction the vehicle is facing
is low.
A fuse is blown. See Fuses and Circuit Breakers
on page 6 117.
The windshield is part of the HUD system.
See Windshield Replacement on page 6 50.
4-40
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The following messages may appear in the HUD:
SPEED ALERT
Posted Speed
When the Speed Advisor feature is turned on, HUD
displays either the posted or advisory speed as
determined by the information on the map disc in the
navigation system. To turn the Speed Advisor on or off,
see DIC Operation and Displays on page 4 70.
Advisory Speed