GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 398

Trailer Brake Control Panel
A. Manual Trailer Brake Apply Lever
B. Trailer Gain Adjustment Buttons
The ITBC system has a control panel located on the
instrument panel to the left of the steering column. See
Instrument Panel Overview (Base/Uplevel version)
on page 3-4 or Instrument Panel Overview (Premium
version) on page 3-6 for more information on location.
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The control panel allows adjustment to the amount of
output, referred to as trailer gain, available to the electric
trailer brakes and allows manual application of the
trailer brakes. The Trailer Brake Control Panel is used
along with the Trailer Brake Display Page on the DIC to
adjust and display power output to the trailer brakes.
Trailer Brake DIC Display Page
The ITBC system displays messages into the vehicle's
Driver Information Center (DIC). See DIC Warnings
and Messages on page 3-66 for more information.
The display page indicates Trailer Gain setting, power
output to the electric trailer brakes, trailer connection
and system operational status.