Cadillac 2014 ATS Owner's Manual page 17

The lamp comes on when
a door is opened.
Turns the lamp on.
There are reading lamps on the
overhead console and over the rear
passenger doors. These lamps
come on when any door is opened.
To manually turn the reading lamps
on or off:
Press or next to each
overhead console reading lamp.
Press the lamp lens to turn the rear
passenger reading lamps on or off.
For more information on interior
lighting, see Instrument Panel
Illumination Control on page 6-6.
The exterior lamp control is on the
turn signal lever.
Turn the control to the following
positions:
Turns off the exterior lamps.
The knob returns to the AUTO
position after it is released. Turn to
again to reactivate the AUTO
mode. In Canada, the headlamps
will automatically reactivate when
the vehicle is shifted out of P (Park)
on automatic transmission vehicles,
and when the parking brake is
released on manual transmission
vehicles.
Automatically turns the
exterior lamps on and off,
depending on outside lighting.
Turns on the parking lamps
including all lamps, except the
headlamps.
Turns on the headlamps
together with the parking lamps and
instrument panel lights.
See Exterior Lamp Controls on
page 6-1 and Daytime Running
Lamps (DRL) on page 6-4.