1999 GMC Jimmy Owner's Manual - Page 243

yellowblue Tow/Haul Mode (V6 Engine, Automatic Transmission Equipped Models) (If Equipped) The Tow/Haul Mode is a feature that assists when pulling a heavy trailer. The purpose of the Tow/Haul Mode is: The Tow/Haul Mode for hauling a heavy trailer is most useful under the following conditions D When driving through hilly terrain at speeds below 55 mph (88 km/h). D Reduce the frequency of shifts when pulling a heavy trailer. D When driving in low speed or stop and go traffic below 55 mph (88 km/h). D Provide the same shift feel when pulling a heavy trailer as when the vehicle is unloaded. pulling a heavy trailer. D When driving in parking lots. Use the Tow/Haul Mode instead of the previous recommendation to shift to THIRD (3) gear to improve fuel economy at highway speeds and shift performance at lower speeds. Operating in the Tow/Haul Mode when not pulling a heavy trailer will not cause damage to the vehicle, but you may experience reduced fuel economy and undesirable performance from the engine and transmission. The Tow/Haul Mode should be used only when pulling a heavy trailer. D Reduce the need to change throttle position when This feature is turned on or off by pressing a button on the floor console. When the feature is on, a light on the instrument panel will illuminate to indicate that the Tow/Haul Mode has been selected. See "Tow/Haul Mode Light" in the Index. The Tow/Haul Mode is automatically turned off each time the vehicle is started. The Tow/Haul Mode is most effective when the vehicle and trailer combined weight is at least 75% of the Gross Vehicle Weight Rating (GVWR) and the maximum trailer weight rating for the vehicle. See "Gross Vehicle Weight Rating" and "Trailer Weight" in the Index. 4-47