Buick 2005 LeSabre Owner's Manual page 131

The HUD shows these images when they are lighted on
the instrument panel cluster.
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.
Notice: If you try to use the HUD image as a
parking aid, you may misjudge the distance and
damage your vehicle. Do not use the HUD image as
a parking aid.
The HUD controls are located on the instrument panel
to the left of the steering wheel.
1. Start your engine and slide the HUD dimmer lever
to HI.
The brightness of the HUD image is determined by
an internal photo-cell, and where you have the
HUD dimmer control set.
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