2008 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 390

Integrated Trailer Brake Control System 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. 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. 4-78