Trailering Systems 2-63
Trailer Gain Adjustment Procedure
• Adjust trailer gain in 0.5 step increments up to 10
gain setting by using the gain adjustment +/−
buttons on the trailer brake control panel switch.
Pressing and holding a gain button will cause the
trailer gain to continuou sly increment or
decrement. To turn the output to the trailer off, set
the gain to zero.
• Drive the tow vehicle and trailer combination on a
level surface representative of the towing
condition and free of traffic at approximatel y 32–
40 km/h (20–25 mph) and fully apply the manual
trailer brake apply lever mechanism located on the
trailer brake control panel switch. Adjusting the
trailer gain at slower speeds may result in an
incorrect gain setting.
• Adjust the trailer gain to just below the threshold of
trailer wheel lock-up . 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.
Trailer Brake Gain and Output Display
This display menu can be accessed by scrolling
through the DIC menu, or any time the trailer gain +/−
button is depressed, or the manual trailer brake apply
lever is actuated. The trailer output is displayed from 0
to full output and indicates the output power provided to
the trailer brakes, relative to the gain setting.
After the electrical connection is made to a trailer
equipped with electric brakes or electric over hydraulic
brakes, the TRAILER CONNECTED messag e will be
displayed momentarily on the DIC. The Trailer Brake
Display Page can be selected on the DIC showing
TRAILER GAIN and OUTPUT, after all vehicle related
service messages are acknowledged by the driver.
Depending on which instrument panel cluster is in the
vehicle, the DIC may display dashed lines, a greyed out
display, or it may be blank signifying a disconnec ted
trailer or a trailer brake fault condition.
Trailer Brake Driver Information Center
Indicators and Messages
Trailer Brake Detection
The K133 Trailer Brake Control Module constantly
monitors the trailer auxiliary control circuit from
Terminal C at the X88 Trailer connector. When a trailer
is connected with trailer brakes, the K133 Trailer Brake
Control Module senses the connection and alerts the
driver with a Trailer Connected message. If the
K133 Trailer Brake Control Module senses a fault,
or the trailer becomes disconnected, the vehicle will
alert the driver with a Check Trailer Wiring message.
The following indicator s are used to inform the driver of
several different conditions:
Trailer Connected
This message will be briefly displayed when a trailer
with Electric or Electric Over Hydraulic brakes is first
connected to the vehicle. This message will
automatically turn off in about ten seconds. The driver
can also acknowledge this message before it
automatically turns off.
Check Trailer Wiring
This message will be displayed if:
• The system detects that a trailer with Electric or
Electric Over Hydraulic brakes is connected to the
vehicle and then the trailer harness becomes
disconnected from the vehicle.
• The trailer connection is recognized initially and
then a disconnec t occurs while the vehicle is
stationary. This message will automatically turn off
in about thirty seconds. This messag e will also
turn off if the driver selects to turn this message off
or if the trailer harness is reconne cted.
• A disconnect of the trailer wiring harness occurs
while the vehicle is moving. The Check Trailer
Wiring message will continue until the ignition is
turned off. The message will also turn off if the
driver selects to turn this message off or it the
trailer harness is re-connected.
• There is an electrical fault in the wiring to the
electric trailer brakes. The Check Trailer Wiring
message will continue as long as there is an
electrical fault in the trailer wiring. This message
will also turn off if the driver acknowledge s this
message off.
• A poor connection at the 7–way connector may
cause the Check Trailer Wiring messag e. Some
aftermarket 7–way trailer side connector adapters
or plugs may cause deformation or excessive
wear to the vehicle’s trailer terminals. It is
recommended that you use an OEM or Pollak
heavy duty 7–way trailer side connector adapter.
Service Trailer Brake System
This message will be displayed when there is a
problem with the trailer brake control system. The trailer
brake system may not be fully functional, or may not be
functioning at all. The trailer brake system is designed
to provide trailer braking, if possible, even when faults
prevent it from being fully functional. This reduced
functionality includes:
1. Providing trailer braking when the master cylinder
pressure or brake pedal switch are faulted.
2. Providing trailer braking when hill start assist and
trailer sway control communication is faulted.
3. Providing trailer braking when certain manual
trailer brake apply lever faults are present.
Trailer Tire Pressure Monitoring
Special Tools
• EL-46079/J-46079 Tire Pressure Monitor
Diagnostic Tool
• EL-50448 Tire Pressure Monitor Sensor
Activation Tool
• EL-52641 Trailer Presence Simulator Tool
For equivalent regional tools, refer to Special Tools.
The Trailer Tire Pressure Monitor System is designed
to monitor the pressure of the trailer tires, and warn the
driver when a low pressure condition exists. Four
Trailer Tire Pressure Monitor System sensors may be
provided in the vehicle’s glove box as an accessory
when equipped. The system can accommoda te a trailer
with up to (6) tires if additional sensors are purchased
from the dealership. Also, the system can be paired
2022 - Silverado 1500 (New) Electrical Body Builder Manual
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