2005 GMC Envoy Owner's Manual - Page 147

Headlamp Washer Your vehicle may be equipped with a headlamp washer system. The button to operate this feature is located on the instrument panel and functions separately from your other washer systems. Cruise Control If your vehicle has cruise control, the controls are located on the end of the turn signal/multifunction lever. To wash your headlamps, press the headlamp washer button briefly and release to activate the system. R(On): Move the switch to this position to turn the cruise control system on. S(Resume/Accelerate): T(Set): Move the switch to this position to resume a set speed or to accelerate. Press this button, located at the end of the lever, to set a speed. 9(Off): This position turns the cruise control system off and cancels memory of a set speed. 3-11