Cadillac 2011 DTS Owner's Manual page 196

When adding electrical equipment, be sure to follow
the proper installation instructions included with the
equipment. See Add-On Electrical Equipment on
page 6 103.
The analog clock is located on the instrument panel
above the radio. The clock is not connected with any
other vehicle system and runs by itself. To adjust the
clock:
1. Locate the adjustment button directly below the
clock face.
2. Push and hold the adjustment button to advance
the clock hands. Holding the button down will
cause the clock to advance faster. Release the
button before reaching the desired time.
3. Push and release the button to increase the time
by one minute increments until the desired time is
reached.
4-34
The heating, cooling, and ventilation for the vehicle can
be controlled with this system.