2020 CADILLAC CT4 Owner's Manual

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
128 LIGHTING
Automatic Headlamp
System
When the exterior lamp control is set
to AUTO and it is dark enough
outside, the headlamps come on
automatically.
The light sensor is on top of the
instrument panel or on the windshield
near the rearview mirror. Do not cover
the sensor, otherwise the headlamps
will come on when they are not
needed.
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 turns off the headlamps.
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 0129.
When it is bright enough outside, the
headlamps will turn off.
The automatic headlamp system turns
off when the exterior lamp control is
turned to
Oor the ignition is off. For
vehicles sold in Canada, this control
only works when the transmission is
in P (Park).
Lights On with Wipers
If the windshield wipers are activated
in daylight with the engine on, and
the exterior lamp control is in AUTO,
the headlamps, parking lamps, and
other exterior lamps come on. The
transition time for the lamps coming on varies based on wiper speed. When
the wipers are not operating, these
lamps turn off. Move the exterior
lamp control to
Oor;to disable
this feature.
Hazard Warning Flashers
|: Press this button to make the
front and rear turn signal lamps flash
on and off. Release the button for at
least one second and press again to
turn the flashers off.
The hazard warning flashers turn on
automatically if the airbags deploy.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
LIGHTING 129
Turn and Lane-Change
Signals
Move the lever all the way up or down
to signal a turn.
An arrow on the instrument cluster
flashes in the direction of the turn or
lane change.
Raise or lower the lever until the
arrow starts to flash to signal a lane
change. Hold it there until the lane
change is completed. If the lever is
briefly pressed and released, the turn
signal flashes three times.
The turn and lane-change signal can
be turned off manually by moving the
lever back to its original position.If after signaling a turn or lane
change, the arrow flashes rapidly or
does not come on, a signal function
may be inoperative. This vehicle may
be equipped with LED lighting. For
replacement of any LED lighting,
contact your dealer.
Cornering Lamps
If equipped with cornering lamps, they
automatically come on when all of the
following occur:
.
The low-beam headlamps are on.
. The turn signals are activated or
the steering wheel is at a turning
angle.
. The vehicle speed is below
40 km/h (25 mph) .
Interior Lighting
Instrument Panel
Illumination Control
The brightness of the instrument
panel lighting, indicators, and switch
backlighting can be adjusted.
D:Move the thumbwheel up or
down to brighten or dim the lights.
The brightness of the displays and
indicators automatically adjusts based
on outdoor lighting. The instrument
panel illumination control will set the

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
130 LIGHTING
lowest level to which the displays and
indicators will automatically be
adjusted.
Courtesy Lamps
The courtesy lamps come on when
any door is opened, the remote key
unlock is pressed, or in transition to
OFF power mode unless the dome
lamp override is activated. To
deactivate the dome lamp override,
press
jOFF and the indicator light
on the button will turn off.
Dome Lamps
The dome lamp controls are in the
overhead console.
To operate, press the following
buttons:
jOFF : Press to turn off the dome
lamps when a door is open. An
indicator light on the button will turn
on when the dome lamp override is
activated. Press
jOFF again to
deactivate this feature and the
indicator light will turn off. The dome
lamps will come on when any door is
opened, the remote key unlock is
pressed, or in transition to OFF
power mode.
+ ON/OFF : Press to turn the dome
lamps on and off manually.
Reading Lamps
There are front and rear reading
lamps on the overhead console and
over the rear passenger doors. These
lamps will come on when any door is
opened, the remote key unlock is
pressed, or in transition to OFF
power mode.
To manually turn the reading lamps
on or off:
Press the lamp lenses on the front
reading lamps.
Press the lamp lenses over the rear
passenger doors.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
LIGHTING 131
Lighting Features
Entry Lighting
Some exterior lamps and most of the
interior lights turn on briefly at night,
or in areas of limited lighting when
K
is pressed on the remote key. See
Remote Keyless Entry (RKE) System
Operation08. When the driver door is
opened, all control lights, Driver
Information Center (DIC) lights, and
door pocket lights turn on. After about
30 seconds the exterior lamps turn
off, then the remaining interior lights
dim to off. Entry lighting can be
disabled manually by changing the
ignition out of the OFF position, or by
pressing
Qon the remote key.
This feature can be changed. See
“Vehicle Locator Lights” underVehicle
Personalization 0116. Entry Lighting with Approach
Detection
If equipped with approach detection,
the entry lighting feature will
automatically turn on when the
remote key is detected within
approximately 2 m (6 ft) of the vehicle.
If the vehicle has remained parked for
an extended period of time with no
remote key use or Keyless Access
operation, approach detection will be
disabled. To reactivate, press any
button on the remote key or open and
close all vehicle doors to re-enable the
entry lighting feature on approach.
Approach detection will not work if:
.
The vehicle battery is low.
. The ignition is on or in ACC/
ACCESSORY.
. Entry lighting is set to Off. See
“Vehicle Locator Lights” under
Vehicle Personalization 0116.
Approach detection will not work with
a single remote key if:
. The remote key is left within a 5 m
(16 ft) range of the vehicle for
several minutes .
The remote key is left inside the
vehicle and all the doors are
closed
To help maximize remote key battery
life, do not store the remote key
within 5 m (16 ft) of the vehicle.
Exit Lighting
Some exterior lamps and interior
lights come on at night, or in areas
with limited lighting, when the driver
door is opened after the ignition is
turned off. The dome lamp comes on
after the ignition is turned off. The
exterior lamps and dome lamp remain
on for a set amount of time, then
automatically turn off.
The exterior lamps turn off
immediately by turning the exterior
lamp control off.
This feature can be changed. See
Vehicle Personalization 0116.
Battery Load Management
The vehicle has Electric Power
Management (EPM), which estimates
the battery's temperature and state of

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
132 LIGHTING
charge. It then adjusts the voltage for
best performance and extended life of
the battery.
When the battery's state of charge is
low, the voltage is raised slightly to
quickly bring the charge back up.
When the state of charge is high, the
voltage is lowered slightly to prevent
overcharging. If the vehicle has a
voltmeter gauge or a voltage display
on the Driver Information Center
(DIC), you may see the voltage move
up or down. This is normal. If there is
a problem, an alert will be displayed.
The battery can be discharged at idle
if the electrical loads are very high.
This is true for all vehicles. This is
because the generator (alternator)
may not be spinning fast enough at
idle to produce all the power that is
needed for very high electrical loads.
A high electrical load occurs when
several of the following are on, such
as: headlamps, high beams, fog lamps,
rear window defogger, climate control
fan at high speed, heated seats, engine
cooling fans, and loads plugged into
accessory power outlets.EPM works to prevent excessive
discharge of the battery. It does this
by balancing the generator's output
and the vehicle's electrical needs.
It can increase engine idle speed to
generate more power, whenever
needed. It can temporarily reduce the
power demands of some accessories.
Normally, these actions occur in steps
or levels, without being noticeable. In
rare cases at the highest levels of
corrective action, this action may be
noticeable to the driver. If so, a DIC
message might be displayed. If a
battery message is displayed, it is
recommended that the driver reduce
the electrical loads as much as
possible. See
Driver Information Center
(DIC) 0109.
Battery Power Protection
The battery saver feature is designed
to protect the vehicle's battery.
If some interior lamps are left on and
the ignition is turned off, the battery
rundown protection system
automatically turns the lamp off after
some time.
Exterior Lighting Battery
Saver
The exterior lamps turn off about
10 minutes after the ignition is turned
off, if the parking lamps or headlamps
have been manually left on. This
protects against draining the battery.
To restart the 10-minute timer, turn
the exterior lamp control to the
O
position and then back to the;or
2position.
To keep the lamps on for more than
10 minutes, the ignition must be on or
in ACC/ACCESSORY.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
INFOTAINMENT SYSTEM 133
Infotainment System
Introduction
Infotainment . . . . . . . . . . . . . . . . . . . . . 133
Introduction
Infotainment
See the infotainment manual for
information on the radio, audio
players, phone, navigation system, and
voice or speech recognition. It also
includes information on settings.
Active Noise Cancellation (ANC)
If equipped, ANC reduces engine noise
in the vehicle’s interior. ANC requires
the factory-installed audio system,
radio, speakers, amplifier (if
equipped), induction system, and
exhaust system to work properly.
Deactivation is required by your dealer
if related aftermarket equipment is
installed.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
134 CLIMATE CONTROLS
Climate Controls
Climate Control Systems
Dual Automatic Climate ControlSystem . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Air Vents
Air Vents . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Maintenance
Passenger Compartment AirFilter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Climate Control Systems
Dual Automatic Climate Control System
The climate control buttons on the center stack and on the climate control
display are used to adjust the heating, cooling, and ventilation system.
Center Stack Climate Controls
1. ON/OFF (Power)
2. AUTO (Automatic Operation)
3. Air Delivery Mode Control
4. Driver Temperature Controls
5. Fan Control
6. Passenger Temperature Controls 7. A/C (Air Conditioning)
8. Recirculation
9. SYNC (Synchronized
Temperature)
10. Defrost
11. Rear Window Defogger

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-13183937) -
2020 - crc - 4/28/20
CLIMATE CONTROLS 135
Climate Control Display
1. Driver and PassengerTemperature Displays
2. Fan Control
3. Driver and Passenger Temperature Controls
4. Sync (Synchronized Temperature)
5. Recirculation
6. Air Delivery Mode Control
7. Auto (Automatic Operation)
8. A/C (Air Conditioning)
9. On/Off (Power) The fan speed, air delivery mode, air
conditioning, driver and passenger
temperatures, and Sync settings can
be controlled by touching CLIMATE
icon on the infotainment Home Page
or the climate button in the
application tray. A selection can then
be made on the front climate control
page displayed. See the infotainment
manual.
Climate Control Status Display
The climate control status display
appears briefly when the center stack
climate controls are adjusted.
Climate Control Influence on
Fuel Economy
The climate control system depends
on other vehicle systems for heat and
power input. Certain climate control
settings can lead to higher fuel usage.
The following climate control settings
use more fuel:
. MAX air conditioning mode
. Defrost mode
. Extreme temperature settings,
such as 15° C (60° F) or 32° C
(90° F)
. High fan speed settings
To help reduce fuel usage:
. Use the full automatic control as
described under “Automatic
Operation.”
. Select a temperature setting that
is higher in hot weather and lower
in cold weather.
. Turn off the air conditioning when
it is not needed.
. Only use defrost to clear the
windows.