WARNING   WARNING:  Hill descent control cannot control descent in all surface conditions and circumstances, such as ice or extremely steep grades. Hill descent control is a driver assist system and cannot substitute for good judgment by the driver. Failure to do so may result in loss of vehicle control, crash or serious injury.

Hill descent control allows you to set and maintain vehicle speed when descending steep grades in various surface conditions.
Hill descent control can maintain vehicle speeds on downhill grades between  mph (3 km/h) and 20 mph (32 km/h). Above 20 mph (32 km/h), the system remains armed, but you cannot use the system to set or maintain the descent speed.
Hill descent control requires a cooling down interval after a period of sustained use. The amount of time that the feature can remain active before cooling varies with conditions.The system provides a warning in the message center and a tone sounds when the system is about to disengage for cooling.At this time, manually apply the brakes as needed to maintain descent speed.