Cadillac 2007 XLR Owner's Manual page 174

As light shines out from the HUD, it is possible for
light to shine back in. In rare occurrences,
when the sun is at a specific angle and position,
the sun's rays can shine back into the HUD. When
this occurs, the display device within the HUD
will be temporarily illuminated. The event will end
when the vehicle's angle to the sun changes.
Clean the inside of the windshield as needed to
remove any dirt or film that reduces the sharpness
or clarity of the HUD image.
To clean the HUD, spray household glass cleaner
on a soft, clean cloth. Wipe the HUD lens gently,
then dry it. Do not spray cleaner directly on the lens
because the cleaner could leak into the unit.
If the ignition is on and you cannot see the HUD
image, check to see if:
•
Something is covering the HUD unit.
•
The brightness is adjusted properly.
•
The HUD image is adjusted to the proper
height.
•
Ambient light in the direction your vehicle is
facing is low.
•
A fuse is blown. See Fuses and Circuit
Breakers on page 453.
174
Keep in mind that your windshield is part of the
HUD system. See Windshield Replacement
on page 412.
The following Adaptive Cruise Control (ACC)
messages may appear in the HUD:
CRUISE SPEED LIMITED: This message
indicates that your vehicle speed has been
reduced below your set speed due to ACC
limitations. Your set speed is too high and ACC
cannot detect other vehicles at far enough
distances for the system to operate properly.
TIGHT CURVE: This message indicates that ACC
has reduced your vehicle speed due to a tight
curve in the road. Once the road straightens, ACC
will return to your selected set speed or follow
distance setting. See "Adaptive Cruise Control
(ACC)" under Turn Signal/Multifunction Lever on
page 141 for more information.
You may also see an ACC active symbol, alert
symbol or vehicle ahead symbol. See "Adaptive
Cruise Control (ACC)" under Turn
Signal/Multifunction Lever on page 141 for more
information.