2021 CADILLAC CT4 light

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 12/4/20
INSTRUMENTS AND CONTROLS 125
Erasing Universal Remote
System Buttons
Erase all programmed buttons when
vehicle ownership is terminated.
To erase:1. Press and hold the two outside buttons until the indicator light
begins to flash. This should take
about 10 seconds.
2. Release both buttons.
Reprogramming a Single
Universal Remote System Button
To reprogram any of the system
buttons: 1. Press and hold any one of the buttons. Do not release the button.
2. The indicator light will begin to flash after 20 seconds. Without
releasing the button, proceed with
Step 1 under “Programming the
Universal Remote System.”

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
126 LIGHTING
Lighting
Exterior Lighting
Exterior Lamp Controls . . . . . . . . . . 126
Exterior Lamps Off Reminder . . . 128
Headlamp High/Low-BeamChanger . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . 128
Daytime Running Lamps (DRL) . . . . . . . . . . . . . . . . . . . . 128
Automatic Headlamp System . . . 128
Hazard Warning Flashers . . . . . . . . 129
Turn and Lane-Change Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Cornering Lamps . . . . . . . . . . . . . . . . . 130
Interior Lighting
Instrument Panel Illumination Control . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Courtesy Lamps . . . . . . . . . . . . . . . . . . 130
Dome Lamps . . . . . . . . . . . . . . . . . . . . . 130
Reading Lamps . . . . . . . . . . . . . . . . . . . 131
Lighting Features
Entry Lighting . . . . . . . . . . . . . . . . . . . . 131
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . 132
Battery Load Management . . . . . . 132
Battery Power Protection . . . . . . . . 133
Exterior Lighting Battery Saver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Exterior Lighting
Exterior Lamp Controls
The exterior lamp control is on the
turn signal lever.
Turn the control to the following
positions:
O:Turns the exterior lamps off and
deactivates the AUTO mode. Turn to
Oagain to reactivate the AUTO mode.
In Canada, the headlamps will
automatically reactivate when the
vehicle is shifted out of P (Park).
AUTO : Automatically turns the
exterior lamps on and off, depending
on outside lighting.
;: Turns on the parking lamps
including all lamps, except the
headlamps.
2: Turns on the headlamps together
with the parking lamps and
instrument panel lights.
IntelliBeam System
If equipped, this system turns the
vehicle's high-beam headlamps on and
off according to surrounding traffic
conditions.
The system turns the high-beam
headlamps on when it is dark enough
and there is no other traffic present.
This light
bcomes on in the
instrument cluster when the
IntelliBeam system is enabled.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
LIGHTING 127
Turning On and Enabling IntelliBeam
To enable the IntelliBeam system,
press
bon the turn signal lever
when it is dark outside and the
exterior lamp control is in AUTO
or
2.
Driving with IntelliBeam
The system only activates the high
beams when driving over 40 km/h
(25 mph).
The blue high-beam on light appears
on the instrument cluster when the
high beams are on. There is a sensor near the top center
of the windshield that automatically
controls the system. Keep this area of
the windshield clear of debris to allow
for best system performance.
The high-beam headlamps remain on,
under the automatic control, until one
of the following situations occurs:
.The system detects an approaching
vehicle's headlamps.
.The system detects a preceding
vehicle's taillamps.
.The outside light is bright enough
that high-beam headlamps are not
required.
.The vehicle's speed drops below
20 km/h (12 mph).
.The IntelliBeam system is disabled
by the button on the turn signal
lever. If this happens, press
bon
the turn signal lever when the
exterior lamp control is in the
AUTO or
2position to reactivate
the IntelliBeam system. The
instrument cluster light will come
on to indicate the IntelliBeam
system is reactivated. The high beams may not turn off
automatically if the system cannot
detect another vehicle's lamps because
of any of the following:
.The other vehicle's lamps are
missing, damaged, obstructed from
view, or otherwise undetected.
.The other vehicle's lamps are
covered with dirt, snow, and/or road
spray.
.The other vehicle's lamps cannot be
detected due to dense exhaust,
smoke, fog, snow, road spray, mist,
or other airborne obstructions.
.The vehicle's windshield is dirty,
cracked, or obstructed by something
that blocks the view of the light
sensor.
.The vehicle is loaded such that the
front end points upward, causing
the light sensor to aim high and not
detect headlamps and taillamps.
.The vehicle is being driven on
winding or hilly roads.
The automatic high-beam headlamps
may need to be disabled if any of the
above conditions exist.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
128 LIGHTING
Exterior Lamps Off
Reminder
A warning chime sounds if the driver
door is opened while the ignition is off
and the exterior lamps are on.
Headlamp High/Low-Beam
Changer
3:Push the turn signal lever away
from you and release, to turn the high
beams on. To return to low beams,
push the lever again or pull it toward
you and release.
This indicator light turns on in the
instrument cluster when the
high-beam headlamps are on.
Flash-to-Pass
To flash the high beams, pull the turn
signal lever toward you, and release.
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.
If equipped, 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 DRL turn off when the headlamps
are turned to
Oor the ignition is off.
For vehicles first sold in Canada, the
DRL can only be turned off when the
vehicle is parked.
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.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
LIGHTING 129
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. SeeInstrument Panel
Illumination Control 0130.
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.
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.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
130 LIGHTING
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
This feature adjusts the brightness of
all illuminated controls.
D:Move the thumbwheel up or
down to brighten or dim the lights.
The thumbwheel is functional at
night, or when the headlamps or
parking lamps are ON.
The brightness of the displays
automatically adjusts based on
outdoor lighting. The instrument panel illumination control will set the
lowest level to which the displays will
automatically be adjusted.
Courtesy Lamps
The courtesy lamps come on when
any door is opened,
Kon the remote
key is pressed, or when the ignition is
switched off. See Dome Lamps0130.
Dome Lamps
The dome lamp controls are in the
overhead console.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
LIGHTING 131
To operate, press the following
buttons:
jOFF :Press to turn off the dome
lamps when any door is opened,
Kon
the remote key is pressed, or when the
ignition is switched off. 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 doors are opened,
Kon the
remote key is pressed, or the ignition
is switched off.
+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,
Kon the remote key is
pressed, or when the ignition is
switched off. To operate, the ignition must be on,
or in ACC/ACCESSORY, or using
Retained Accessory Power (RAP).
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.
Lighting Features
Entry Lighting
Some exterior lamps turn on briefly at
night, or in areas with limited lighting,
when
Kis pressed on the remote key,
see Remote Keyless Entry (RKE) System
Operation 07. After about 30 seconds
the exterior lamps turn off. Entry
lighting can be disabled manually by
turning the ignition on or to ACC/
ACCESSORY, or by pressing
Qon the
remote key. When any door is opened
or remote unlock pressed, all interior
lights turn on and then interior lamps
dim to off after 20 seconds after all
doors are closed.
The entry lighting feature for exterior
lighting can be changed. See “Vehicle
Locator Lights” underVehicle
Personalization 0117.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
132 LIGHTING
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 0117.
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 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 or any door is
opened. The exterior lamps and dome
lamp remain on after the door is
closed for a set amount of time, then
automatically turn off.
The exterior lamps turn off
immediately by turning the exterior
lamp control off.
The exit lighting for exterior lights can
be changed. See Vehicle Personalization
0 117.
Battery Load Management
The vehicle has Electric Power
Management (EPM), which estimates
the battery's temperature and state of
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.