Daytime Running; Lamps (Drl); Automatic Headlamp; System - Cadillac ATS Owner's Manual

If the headlamps are in
high-beam mode, they will go to
low beam.

Daytime Running

Lamps (DRL)

DRL can make it easier for others to
see the front of your vehicle during
the day. Fully functional DRL are
required on all vehicles first sold in
Canada.
The DRL system turns on the
low-beam headlamps at a reduced
brightness. For vehicles with High
Intensity Discharge (HID)
headlamps, there is a dedicated
DRL. The DRL will come on when
all of the following conditions
are met:
The ignition is on.
The exterior lamp control is
in AUTO.
The light sensor determines it is
daytime.
The parking brake is released or
the vehicle is not in P (Park).
The taillamps, sidemarker lamps,
instrument panel lights, and other
lamps will not be on.
The DRL turn off when the
headlamps are turned to
ignition is off.

Automatic Headlamp

System

When the exterior lamp control is
set to AUTO and it is dark enough
outside, the headlamps come on
automatically.
There is a light sensor on top of the
instrument panel. Do not cover the
sensor, otherwise the headlamps
will come on when they are not
needed.
or the
The system may also turn on the
headlamps when driving through a
parking garage or tunnel.
If the vehicle is started in a dark
garage, the automatic headlamp
system comes on immediately. If it
is light outside when the vehicle
leaves the garage, there is a slight
delay before the automatic
headlamp system changes to the
DRL. During that delay, the
instrument cluster may not be as
bright as usual. Make sure the
instrument panel brightness control
is in the full bright position. See
Instrument Panel Illumination
Control 0 165.
When it is bright enough outside,
the headlamps will turn off or may
change to Daytime Running
Lamps (DRL).
Lighting 163