Cadillac 2011 DTS Owner's Manual page 164

If the turn signal is left on, a warning chime sounds and
the Driver Information Center (DIC) will display TURN
SIGNAL ON after driving about a mile as a reminder to
turn it off. See DIC Warnings and Messages on
page 4 62.
Push forward to change the headlamps from low beam
to high. Pull the lever back and then release it to
change from high beam to low.
4-6
This light on the
instrument panel cluster
will be on, indicating
high-beam usage.
For vehicles with this feature, read the following section
before using it.
This vehicle has systems that operate on a radio
frequency that comply with Part 15 of the Federal
Communications Commission (FCC) rules and with
Industry Canada Standards RSS 210/220/310.
Operation is subject to the following two conditions:
1. The device may not cause interference.
2. The device must accept any interference received,
including interference that may cause undesired
operation of the device.
Changes or modifications to this system by other than
an authorized service facility could void authorization to
use this equipment.