Chevrolet Silverado 1500 2023 Owner's Manual page 316

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 displays.
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 to apply the trailer's electric
brakes independent of the vehicle brakes.
Use this lever to adjust Trailer Gain to
achieve the proper power output to the
trailer brakes. This lever may also be used
to request additional trailer braking at any
time. The trailer and the vehicle 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 40 km/h
(20 25 mph) and fully apply the Manual
Trailer Brake Apply Lever.
Adjusting Trailer Gain at speeds lower
than 32 40 km/h (20 25 mph) may result
in an incorrect gain setting.
Driving and Operating
2. Adjust the Trailer Gain, using the Trailer
Gain (+) or ( ) 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.
Trailer wheel lock-up may not occur if
towing a heavily loaded trailer. Adjust
the Trailer Gain to the highest allowable
setting for the towing condition.
3. Readjust Trailer Gain anytime vehicle
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 from the vehicle.
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