Cadillac 2007 XLR Owner's Manual page 173

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+ - (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.
The HUD controls are
located to the left of the
steering wheel.
To adjust the HUD so you can see it properly, do
the following:
1. Adjust the seat to a comfortable driving
position. If you change your seat position later,
you may have to re-adjust your HUD.
2. Start your engine and press the top or bottom
of the HUD button to center the HUD image in
your view.
The HUD image can only be adjusted up and
down, not side-to-side.
3. Press the DIMMER button until the DIC reads
HUD DIMMING. Then use the brightness
button to adjust the desired intensity.
The brightness of the HUD image is determined
by the light conditions in the direction your vehicle
is facing and where you have the HUD set. If
you are facing a dark object or a heavily shaded
area, your HUD may anticipate that you are
entering a dark area and may begin to dim.
To turn off the HUD, press the brightness button
down until the image disappears.
Polarized sunglasses could make the HUD image
harder to see.
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