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TRAILER OUTPUT: This displays
anytime a trailer with electric brakes
is connected. Output to the trailer
brakes is based on the amount of
vehicle braking present and relative to
the Trailer Gain setting. Output is
displayed from 0 to 100% for each
gain setting.
The Trailer Output will indicate
“- - - - - -”on the Trailer Brake Display
Page whenever the following occur:
.No trailer is connected.
.A trailer without electric brakes is
connected, no DIC message will
display
.A trailer with electric brakes has
become disconnected, a CHECK
TRAILER WIRING message displays
on the DIC
.There is a fault present in the
wiring to the trailer brakes, a
CHECK TRAILER WIRING message
displays on the DIC
.The ITBC system is not working due
to a fault, a SERVICE TRAILER
BRAKE SYSTEM message displays
in the DIC Manual Trailer Brake Apply Lever
Slide this lever right to apply the
trailer’s electric brakes independent of
the vehicle’s brakes. Use this lever to
adjust Trailer Gain to achieve the
proper power output to the trailer
brakes. The trailer's and the vehicle's
brake lamps will come on when either
vehicle brakes or manual trailer brakes
are applied and properly connected.
Trailer Gain Adjustment Procedure
Trailer Gain should be set for a
specific trailering condition and it
must be readjusted anytime vehicle
loading, trailer loading, or road surface
conditions change.
{Warning
Trailer brakes that are over-gained
or under-gained may not stop the
vehicle and the trailer as intended
and can result in a crash. Always
follow the instructions to set the
Trailer Gain for the proper trailer
stopping performance.
To adjust Trailer Gain for each towing
condition:
1. Drive the vehicle with the trailer attached on a level road surface
representative of the towing
condition and free of traffic at
about 32 to 40 km/h (20 to 25 mph)
and fully apply the Manual Trailer
Brake apply lever.
Note
Adjusting Trailer Gain at speeds lower
than 32 to 40 km/h (20 to 25 mph)
may result in an incorrect gain
setting. 2. Adjust the Trailer Gain, using the Trailer Gain adjustment buttons, to
just below the point of trailer
wheel lock-up, indicated by trailer
wheel squeal or tire smoke when a
trailer wheel locks.
Note
Trailer wheel lock-up may not occur if
towing a heavily loaded trailer. In this
case, adjust the Trailer Gain to the
highest allowable setting for the
towing condition.
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3. Readjust Trailer Gain any timevehicle loading, trailer loading,
or road surface conditions change
or if trailer wheel lock-up is
noticed at any time while towing.
Other ITBC-Related DIC Messages
TRAILER BRAKES CONNECTED: This
message will briefly display when a
trailer with electric brakes is first
connected to the vehicle. This
message will automatically turn off in
about 10 seconds. This message can
be acknowledged before it
automatically turns off.
CHECK TRAILER WIRING: This
message will display if:
.The ITBC system first determines
connection to a trailer with electric
brakes and then the trailer harness
becomes disconnected the vehicle.
If the disconnect occurs while the
vehicle is stationary, this message
will automatically turn off in about
30 seconds. This message will also
turn off if it is acknowledged or if
the trailer harness is reconnected. If the disconnect occurs while the
vehicle is moving, this message will
continue until the ignition is turned
off. This message will also turn off if
it is acknowledged or if the trailer
harness is reconnected.
.There is an electrical fault in the
wiring to the trailer brakes. This
message will continue as long as
there is an electrical fault in the
trailer wiring. This message will also
turn off if it is acknowledged.
To determine whether the electrical
fault is on the vehicle side or trailer
side of the trailer wiring harness
connection: 1. Disconnect the trailer wiring harness from the vehicle.
2. Turn the ignition off.
3. Wait 10 seconds, then turn the ignition back to RUN.
4. If the CHECK TRAILER WIRING message reappears, the electrical
fault is on the vehicle side. If the CHECK TRAILER WIRING
message only reappears when
connecting the trailer wiring
harness to the vehicle, the
electrical fault is on the trailer side.
SERVICE TRAILER BRAKE SYSTEM:
This message will display when there
is a problem with the ITBC system.
If this message continues over
multiple ignition cycles, there is a
problem with the ITBC system. Have
the vehicle serviced.
If either the CHECK TRAILER WIRING
or SERVICE TRAILER BRAKE SYSTEM
message displays while driving, the
ITBC system may not be fully
functional or may not function at all.
When traffic conditions allow,
carefully pull the vehicle over to the
side of the road and turn the ignition
off. Check the wiring connection to
the trailer and turn the ignition back
on. If either of these messages
continues, either the vehicle or trailer
needs service.
A GM dealer may be able to diagnose
and repair problems with the trailer.
However, any diagnosis and repair of
the trailer is not covered under the
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vehicle warranty. Contact your trailer
dealer for assistance with trailer
repairs and trailer warranty
information.
Trailer Sway Control (TSC)
Vehicles with StabiliTrak/Electronic
Stability Control (ESC) have a Trailer
Sway Control (TSC) feature. Trailer
sway is unintended side-to-side
motion of a trailer while towing. If the
vehicle is towing a trailer and the TSC
detects that sway is increasing, the
vehicle brakes are selectively applied
at each wheel, to help reduce
excessive trailer sway. If equipped with
the Integrated Trailer Brake Control
(ITBC) system, and the trailer has an
electric brake system, StabiliTrak may
also apply the trailer brakes.If TSC is enabled, the Traction Control
System (TCS)/StabiliTrak warning
light will flash on the instrument
cluster. Reduce vehicle speed by
gradually removing your foot from the
accelerator. If trailer sway continues,
StabiliTrak can help slow the vehicle
down. TSC will not function if
StabiliTrak is turned off. SeeTraction
Control/Electronic Stability Control
0 265.
{Warning
Trailer sway can result in a crash
and in serious injury or death, even
if the vehicle is equipped with TSC.
If the trailer begins to sway, reduce
vehicle speed by gradually removing
your foot from the accelerator. Then
pull over to check the trailer and
vehicle to help correct possible
(Continued)
Warning (Continued)
causes, including an improperly or
overloaded trailer, unrestrained
cargo, improper trailer hitch
configuration, or improperly
inflated or incorrect vehicle or
trailer tires. SeeTowing Equipment
0 344 for trailer ratings and hitch
setup recommendations.
Aftermarket Electronic Trailer
Sway Control Devices
Some trailers may come equipped
with an electronic device designed to
reduce or control trailer sway.
Aftermarket equipment manufacturers
also offer similar devices that connect
to the wiring between the trailer and
the vehicle. These devices may
interfere with the vehicle’s trailer
brake systems or other systems,
including integrated anti-sway
systems, if equipped. Messages related
to trailer connections or trailer brakes
could appear on the DIC. The effects
of these aftermarket devices on
vehicle handling or trailer brake
performance is not known.
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{Warning
Use of aftermarket electronic trailer
sway control devices could result in
reduced trailer brake performance,
loss of trailer brakes, or other
malfunctions, and result in a crash.
You or others could be seriously
injured or killed. Before using one
of these devices:
.Ask the device or trailer
manufacturer if the device has
been thoroughly tested for
compatibility with the make,
model, and year of your vehicle
and any optional equipment
installed on your vehicle.
.Before driving, check the trailer
brakes are working properly,
if equipped. Drive the vehicle
with the trailer attached on a
level road surface that is free of
traffic at about 32-40 km/h
(20-25 mph) and fully apply the
manual trailer brake apply lever.
Also, check the trailer brake
lamps and other lamps are
functioning correctly.(Continued)
Warning (Continued)
.If the trailer brakes are not
operating properly at any time,
or if a DIC message indicates
problems with the trailer
connections or trailer brakes,
carefully pull the vehicle over to
the side of the road when traffic
conditions allow.
Trailer Tires
Special Trailer (ST) tires differ from
vehicle tires. Trailer tires are designed
with stiff sidewalls to help prevent
sway and to support heavy loads.
These features can make it difficult to
determine if the trailer tire pressures
are low only based on a visual
inspection.
Always check all trailer tire pressures
before each trip when the tires are
cool. Low trailer tire pressure is a
leading cause of trailer tire blow-outs.
If the vehicle is equipped with a trailer
tire pressure monitoring system, see
the trailer tire pressure monitoring
system description and the
trailering app. Trailer tires deteriorate over time. The
trailer tire sidewall will show the week
and year the tire was manufactured.
Many trailer tire manufacturers
recommend replacing tires more than
six years old.
Overloading is another leading cause
of trailer tire blow-outs. Never load
your trailer with more weight than the
tires are designed to support. The load
rating is located on the trailer tire
sidewall.
Always know the maximum speed
rating for the trailer tires before
driving. This may be significantly
lower than the vehicle tire speed
rating. The speed rating may be on
the trailer tire sidewall. If the speed
rating is not shown, the default trailer
tire speed rating is 105 km/h (65 mph).
Trailering App
Trailer Lights App
If equipped, the Trailer Lights App is
on the Home Page of the infotainment
display.
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Touch Start to cycle the trailer lamps
on and off to determine if they are
working. The test follows this
sequence:1. The running lights turn on first and remain on throughout the
sequence.
2. The brake lights turn on for about two seconds.
3. The left turn signal light flashes three times.
4. The right turn signal light flashes three times.
5. The reverse lights turn on for about two seconds.
6. Steps 2–5 repeat for approximately one minute and 45 seconds,
or until the test deactivates.
Touch Stop to stop the test. The test
will automatically end after
one minute and 45 seconds.
The sequence also deactivates when
any of the following occur:
.The ignition is turned off.
.The transmission is shifted out of
P (Park).
.The brake pedal is pressed.
.The turn signal is activated.
.The hazard warning lights are
activated.
Trailering App
If equipped, the Trailering App is on
the Home Page of the infotainment
display.
If equipped this feature allows profiles
for connected trailers to be created to
view status, to store and track trailer
usage information, and to set up
towing assistance features.
The Trailering App Preview will
appear when the Trailering App is
opened for the first time from the
Home Page. Touch GET STARTED in
the Trailering App to go into the app.
When a trailer is electrically
connected and a trailer profile has not
been created, there will be an option
to create a profile, use a guest profile,
or select Accessory/No trailer. After
the pop-up is displayed three times,
Don’t Remind Me will display and
touching that will turn off the trailer
detection pop-up. To turn the Trailer
Detection Alert on, select ON in the
Settings tab. When a trailer is electrically
connected and after a Trailer Profile
has been created, the trailer detection
pop-up will appear with a list of all of
the custom Trailer Profiles made on
the vehicle. To load an existing Trailer
Profile, select one of the Trailer
Profiles listed, or load the Guest
Trailer Profile by selecting GUEST
TRAILER. Touching Accessory/No
trailer will select Accessory/No trailer
as the active Trailer Profile and will
dismiss the pop- up. Shifting the
vehicle from P (Park) will select Guest
Trailer as the active Trailer Profile and
will dismiss the pop-up.
Create a Trailer Profile
1. Touch Create Profile on the trailer detection pop-up or touch + Add
Trailer Profile in the Trailering App.
2. Create a name for the trailer.
3. Select the trailer type.
4. Select Save Profile.
A pop-up will indicate the setup is
complete. Touch DONE to complete
the process or touch TRAILER
FEATURE SETUP to set up the
Tow/Haul Mode reminder, Trailer Tire
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Pressure Monitoring System,
if equipped, maintenance reminders,
or towing assistance, if equipped.
Import a Trailer Profile
A trailer profile saved to an OnStar
account can be imported to the
vehicle.1. Touch + Add Trailer Profile in the Trailering App
2. Touch Import Profile on the pop-up.
3. Select a trailer profile from the list.
4. Touch IMPORT.
A pop-up will indicate the import was
successful. Touch OK to return to the
trailer list and select the trailer profile.
The Tow/Haul Mode reminder, Brake
Gain Setting and Trailer Tire Pressure
sensor learning, if equipped, do not
import.
Trailer Feature Setup
Tow/Haul Mode Reminder
To turn the Tow/Haul Mode Reminder
setting on, touch Yes. To turn it off,
touch No. Trailer Tire Pressure Setup
If the Trailer Tire Pressure Monitoring
System (TTPMS) is detected, touch
the Tire Pressure Monitoring icon to
set up tire pressure monitoring. Touch
Yes to set up the sensors or touch No
to return to the previous screen.
The trailer tire pressure sensors can
transmit up to 7 m (23 ft) from the
hitch receiver of the vehicle.
A trailer must be electrically
connected to the vehicle before
starting the sensor-to-vehicle learn
process.
After selecting Start from the Learn
Sensors screen, use the Tool Method
or the Manual Method (described
below) to learn each tire sensor,
during which the current tire number
will be highlighted.
Each sensor has a minimum of
two minutes to learn, shown by a
timer. After a sensor is learned, a
checkmark appears next to the tire,
the vehicle horn will sound, the
vehicle’s brake lamps will flash, and
all working trailer lamps will flash.
It then moves to the next sensor.To cancel the process touch Stop.
The recommended tire pressure must
be entered for the trailer tires. This
allows the vehicle to alert when the
tire pressure is high or low.
TTPMS must learn the location of the
installed tire sensors to show correct
air pressure and temperature for each
tire. To set up, use one of the
following options or see a tire or
trailer dealer for service. The learning
process must be repeated when the
trailer tires are rotated or replaced.
See
“Editing a Trailer Profile ”later in
this section for tire pressure sensor
relearn information.
Tool Method: A TTPMS activation tool
can be purchased separately to learn
the sensor locations.
Manual Method: Without the tool, the
air pressure can be increased or
decreased in each tire for 10 seconds.
Do not exceed the maximum inflation
pressure found on the tire sidewalls.
Make sure to re-adjust tire pressure to
the recommended level when the
process is complete.
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Sensor Learning Steps
To complete the sensor-to-vehicle
learn process:1. Touch Start on the Learn Sensors screen. The horn chirps twice and
the Learning Active screen appears
on the infotainment display.
2. Start with the driver side front trailer tire.
3. Activate the tool near the valve stem or adjust the air pressure of
this tire until the horn chirps and
all working vehicle and trailer
lights flash.
The process stops without saving
the sensor locations if this step
takes more than two minutes.
4. Move to the next tire and repeat Step 3 for each sensor. The horn
chirps twice when all sensors are
completed.
5. Return to the vehicle to complete the setup.
Maintenance Reminders
To set up maintenance reminders,
touch the Trailer Maintenance icon.
Select Yes to set up the maintenance reminders for the Trailer Profile.
Follow the on-screen prompts. The
maximum number of reminders is 50.
Select No to return to the previous
screen.
Towing Assistance
To set up towing assistance features,
if equipped, touch the Towing
Assistance icon.
Touch Yes to begin set up or touch No
to return to the previous screen.
1. Select the number of axles on the trailer.
2. Enter trailer dimensions
3. Follow the on-screen instructions to complete setup for available
features.
Rear Trailer Guidance Setup, If
Equipped
A rear trailer camera must be
mounted on the trailer and electrically
connected to the vehicle before rear
trailer guidance feature can be used.
See Assistance Systems for Parking or
Backing 0303. Trailer dimensions must be in range
to enable this feature.
Trailer Length: 300 cm (118.1 in)
–
1300 cm (511.8 in). Measure from
center of coupler to furthest rear point
on the trailer.
1. If trailer dimensions are out of range, this feature will be
unavailable.
2. Ensure rear trailer camera is connected.
3. Follow instructions to drive forward to complete calibration.
Trailer Length Indicator Setup
1. Follow instructions to driveforward to complete calibration.
Trailer Side Blind Zone Alert
Setup
Trailer dimensions must be in range
to enable this feature.
.Trailer Length: 300 cm (118.1 in) –
1200 cm (472.4 in). Measure from
center of coupler to furthest rear
point on the trailer.
If trailer dimensions are out of range,
this feature will be unavailable.
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Status View
The Status view shows:
.Vehicle
.Connections
.Tires
.Maintenance
.Cameras
Upon entry, the most recent items will
be shown.
Connections
1. Trailer Electrical Diagnostics
2. Light Test Start Button
Connections: OK
If a trailer connection is detected
without any faults, the view will
display NO FAULTS DETECTED.
Trailer Connections Status
When a trailer is connected, the
Trailering App System detects the
trailer connection using the Stop/Turn
Signal lighting circuits and alerts the
driver by requesting a trailer profile
setup through the Trailering App
System on the infotainment screen.
The Trailer Detection Alert setting
must be enabled for the alert to
display when a trailer is connected.
When a trailer is connected and the
ignition is off, the Trailering App
System will periodically pulse the
lighting circuits of the trailer to verify
it is still connected. The trailer lights
may periodically flash as a result of
this trailer connection detection.
These flashes may be more visible in
dark ambient light environments. The
flashing or flickering lights are a
normal condition and the Trailering
App System has built-in protections to
prevent the battery from draining. When Theft Alert is also enabled the
frequency and pattern of this flashing
will change.
If a connected trailer becomes
disconnected, a message about the
trailer disconnect will appear on the
DIC immediately (if vehicle is on) or
upon next ignition cycle (if trailer was
disconnected while vehicle is off).
Check your trailer connection if
needed.
Connection Problem
If any of the trailer connections are
lost, a message about the connection
issue will appear on the Driver
Information Center (DIC). The
infotainment display will also show
the connection issue in the
Connection Status view.
If a trailer connection is not detected,
the Trailering App will not display the
Connection Status screen.