Cadillac 2006 CTS Owner's Manual page 10

Heated Seats
There is one button for the driver and one for the front
passenger. Each button has three settings, LO, HI
and off. The active setting appears on the climate control
panel display. The LO setting warms the seatback
and cushion until the seat approximates normal body
temperature. The HI setting has a slightly higher
temperature.
1-4
If your vehicle has heated
front seats, the buttons are
located on the climate
control panel.
To turn on the heated seats, press the button once.
The seat will heat to the HI setting. Press the button
again to switch to the LO setting. Pressing the button a
third time turns the system off.
The heated seats can only be used when the ignition is
turned on. When the vehicle is turned off, the heated
seats automatically turn off. If you wish to have the
heated seats on once the vehicle is restarted, press the
button again.