Chevrolet 2008 Silverado 1500 Pickup Owner's Manual page 390

Integrated Trailer Brake Control
System
This symbol is located on the Trailer Brake Control
Panel on vehicles with an Integrated Trailer Brake
Control System. The power output to the trailer brakes
is based on the amount of brake pressure being
applied by your vehicle's brake system. This available
power output to the trailer brakes can be adjusted
to a wide range of trailering situations.
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Your vehicle may have an
Integrated Trailer Brake
Control (ITBC) system for
electric trailer brakes.
The ITBC system is integrated with your vehicle's brake,
anti-lock brake and StabiliTrak (if equipped) systems.
In trailering conditions that cause your vehicle's anti-lock
brake or StabiliTrak systems to activate, power sent
to the trailer's brakes will be automatically adjusted to
minimize trailer wheel lock-up. This does not imply
that your trailer has the StabiliTrak system.
If your vehicle's brake, anti-lock brake or StabiliTrak
systems are not functioning properly, your ITBC system
may not be fully functional or may not function at all.
Make sure all of these systems are fully operational to
ensure full functionality of the ITBC system.
The ITBC system is powered through your vehicle's
electrical system. Turning the ignition off will also turn off
the ITBC system. The ITBC system is fully functional
only when the ignition is in ON or in RUN.
The ITBC system can only be used with trailers with
electric brakes.