2-60 Trailering Systems
illuminating the lamps on the attached trailer. The
Trailer Lamp Control Module constantly monitors for
trailer connection status, trailer lighting faults, and
trailer theft deterrent purposes. This is accomplished
through the lighting circuits of the trailer to determine if
a trailer is connected. When a trailer is connected, the
Trailer Lamp Control Module senses the trailer
connection and alerts the driver by requesting a trailer
profile setup through the Trailering App, which is
displayed on the infotainment screen. If a trailer is
disconnected with the ignition ON, the vehicle will
display multiple trailer lighting messages until a trailer is
reconnected or the message is dismissed by the user.
With the key OFF, the Trailer Lamp Control Module will
periodically pulse the lighting circuits of the trailer to
verify it is still connected. The lights on the trailer may
flash at different intervals with the key OFF depending
on which type of lights the trailer is built with. If a trailer
is disconnected with the key ON, the vehicle will display
a trailer disconnected message until a trailer is
reconnected or the ignition is cycled.
Export (13-Terminal connector)
Export vehicles use a 13-way trailer connector for
trailering features. The K68 Trailer Lamp Control
Module is responsible for controlling the trailer lighting
on vehicles with U1D/UET. The combined trailer turn
signal and park lamps of the trailer must draw at least
55mA of total current to be detected as a trailer or the
Trailer Lamp Control Module will not control the lighting
circuits. The Trailer Lamp Control Module receives
serial data messages from the K9 Body Control Module
(BCM) indicating what lamps have been activated on
the vehicle. The Trailer Lamp Control Module respond s
by applying pulse width modulated voltage (PWM) to
the appropriate control circuits for the requested lamps
illuminating the lamps on the attached trailer. The
Trailer Lamp Control Module constantly monitors for
trailer connection status, trailer lighting faults, and
trailer theft deterrent purposes. This is accomplished
through the lighting circuits of the trailer to determine if
a trailer is connected. With the key OFF, the Trailer
Lamp Control Module will periodically pulse the lighting
circuits of the trailer to verify it is still connected. The
lights on the trailer may flash at different intervals with
the key OFF depending on which type of lights the
trailer is built with.
Trailer Lighting Without U1D/UET
The K219 Lighting Control Module is responsible for
controlling the trailer lighting on vehicles without U1D/
UET. The lighting control module receives serial data
messages from the K9 Body Control Module (BCM)
indicating what lamps have been activated on the
vehicle. The lighting control module responds by
applying voltage to the appropriate relay control circuits
for the requested lamps anytime the vehicle lamps are
commanded ON. With the relay coil energized, the
relay contacts close and allow voltage to flow through
the relay illuminating the appropriate lamps on the
attached trailer.
North America 7–Way Trailer Connector
Trailer Messages
The driver information center (P16 Instrument Cluster)
or infotainment screen (P17 Info Display Module) may
display one or more of the following messages to the
user related to trailering.
North America 7–Way Trailer Connector
Trailering Message Description
Check Trailer Left Turn Signal Lamp The K68 Trailer Lighting Control Module detects a fault on the left trailer
stop/turn lamp control circuit
Check Trailer Right Turn Signal Lamp The K68 Trailer Lighting Control Module detects a fault on the right trailer
stop/turn lamp control circuit
Check Trailer Rear Lamp The K68 Trailer Lighting Control Module detects a fault on the trailer park
lamp control circuit.
Check Trailer Reversing Lamp The K68 Trailer Lighting Control Module detects a fault on the trailer
backup lamp control circuit.
Check Trailer Brake Lamps The K68 Trailer Lighting Control Module detects a fault on the left and/or
right trailer stop/turn lamp control circuits
{JL1} Check Trailer Wiring The K133 Trailer Brake Power Control Module detects a fault on the trailer
brake control circuit or the trailer was disconnected.
Lane Change Alert Off Reminder to the user that lane change alerts are turned off anytime a
trailer is detected.
Rear Cross Traffic Alert Off Reminder to the user that rear cross traffic alerts are turned off anytime a
trailer is detected.
Rear Park Assist Off Reminder to the user that rear park assist is turned off anytime a trailer is
detected.
Remember to turn On Tow/Haul Mode Reminder to the user to turn ON Tow/Haul Mode when towing.
{JL1} Service Trailer Brake System The K133 Trailer Brake Power Control Module detects a fault on the trailer
brake control circuit.
Service Trailer Tire Monitor System The K214 Trailer Tire Pressure Indicator Module detects one or more
issues with the trailer tire pressure monitoring system.
2022 - Silverado 1500 (New) Electrical Body Builder Manual
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