GMC Sierra Limited 1500 2019 Owner's Manual page 319

318 Driving and Operating
adjustment to the amount of output,
referred to as Trailer Gain, available
to the trailer brakes and allows
manual application of the trailer
brakes. Use the ITBC control panel
and the DIC trailer brake display
page to adjust and display power
output to the trailer brakes.
Trailer Brake DIC Display Page
The ITBC display page indicates
Trailer Gain setting
Output to the trailer brakes
Trailer connection
System operational status.
To display
Scroll through the DIC menu
pages
Press a Trailer Gain (+) or ( )
button
Activate the Manual Trailer
Brake Apply Lever
Press a Trailer Gain button to recall
the current Trailer Gain setting.
Each press and release of the gain
buttons will then change the Trailer
Gain setting.
TRAILER GAIN:
Press the Trailer Gain (+) or ( ) to
adjust. Press and hold to
continuously adjust the Trailer Gain.
To turn the output to the trailer off,
adjust the Trailer Gain setting to 0.0.
This setting can be adjusted from
0.0 to 10.0 with a trailer connected
or disconnected.
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 left 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.