Cadillac 2011 STS Owner's Manual page 195

FCA may occasionally provide an unnecessary warning
to guard rails, signs, and other stationary objects. This
is normal operation, your vehicle does not need service.
There are three messages that may appear on the
Driver Information Center (DIC). They are CLEAN
RADAR, RADAR CRUISE NOT READY and SERVICE
RADAR CRUISE. See DIC Warnings and Messages on
page 4 76.
The radar can become blocked by snow, ice, or dirt.
If so, you may need to turn off the engine and clean the
lens. See Cleaning the System under Adaptive Cruise
Control on page 4 15.
This feature allows you to use the high-beam
headlamps to signal the driver in front of you that you
want to pass.
Pull and hold the turn signal/multifunction lever toward
you to use this feature. When this is done the following
will occur:
If the headlamps are off, in low-beam or in Daytime
Running Lamps (DRL) mode, the high-beam
headlamps will turn on. They will stay on as long
as the lever is held there. Release the lever to turn
them off.
If the headlamps are in high-beam mode, they will
switch to low beam. To return to high-beam, push
the lever forward.
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