GMC 2009 Yukon XL Owner's Manual page 386

The Trailer Brake Display Page can be displayed by
performing any of the following actions:
•
Scrolling through the DIC menu pages using the
odometer trip stem or the DIC Vehicle Information
button (if equipped).
•
Pressing a Trailer Gain button – If the Trailer Brake
Display Page is not currently displayed, pressing a
Trailer Gain button will first recall the current
Trailer Gain setting. After the Trailer Brake Display
Page is displayed, each press and release of
the gain buttons will then cause the Trailer Gain
setting to change.
•
Activating the Manual Trailer Brake Apply lever
•
Connecting a trailer equipped with electric trailer
brakes
All DIC warning and service messages must first be
acknowledged by the driver by pressing the odometer trip
stem or the DIC Vehicle Information button (if equipped)
before the Trailer Brake Display Page can be displayed
and Trailer Gain can be adjusted.
TRAILER GAIN – This setting is displayed anytime the
Trailer Brake Display Page is active. This setting can be
adjusted from 0.0 to 10.0 with either a trailer connected or
disconnected. To adjust the Trailer Gain, press one of the
Trailer Gain adjustment buttons located on the Trailer
Brake Control Panel. Press and hold a gain button to
4-64
cause the Trailer Gain to continuously adjust. To turn the
output to the trailer off, adjust the Trailer Gain setting to
0.0 (zero).
0.0 (zero) gain is the factory default setting. To properly
adjust trailer gain, see the Trailer Gain Adjustment
Procedure later in this section.
TRAILER OUTPUT – This is displayed any time a trailer
with electric brakes is connected. Output to the electric
brakes is based on the amount of vehicle braking present
and relative to the Trailer Gain setting. Output is
displayed from 0 to 10 bars 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 is displayed).
•
A trailer with electric brakes has become
disconnected (a CHECK TRAILER WIRING
message will also be displayed on the DIC).
•
There is a fault present in the wiring to the electric
trailer brakes (a CHECK TRAILER WIRING
message will also be displayed on the DIC).
•
There is a fault in the ITBC system (a SERVICE
TRAILER BRAKE SYSTEM message will also
be displayed in the DIC).