2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 451

2010 GMC Sierra 1500 Crew Cab Manual

Page 451 highlights

3. After the electrical connection is made to a trailer equipped with electric brakes: . A TRAILER CONNECTED message will be briefly displayed on the DIC display. The Trailer Brake Display Page will appear on the DIC showing TRAILER GAIN and TRAILER OUTPUT. In the Trailer Output display on the DIC will disappear if there is no error present. Connecting a trailer without electric brakes will not clear the six dashed lines. . 5. Drive the vehicle with the trailer attached on a level road surface representative of the towing condition and free of traffic at about 20 to 25 mph (32 to 40 km/h) and fully apply the Manual Trailer Brake Apply lever. Adjusting trailer gain at speeds lower than 20 to 25 mph (32 to 40 km/h) may result in an incorrect gain setting. 6. Adjust the Trailer Gain to just below the point of trailer wheel lock-up, indicated by trailer wheel squeal or tire smoke when a trailer wheel locks. Trailer wheel lock-up may not occur if towing a heavily loaded trailer. In this case, adjust the Trailer Gain to the highest allowable setting for the towing condition. 7. Re-adjust Trailer Gain any time vehicle loading, trailer loading or road surface conditions change or if trailer wheel lock-up is noticed at any time while towing. . 4. Adjust the Trailer Gain by using the gain adjustment (+ / -) buttons on the Trailer Brake Control Panel. 5-75

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