Do not attempt a steep descent if the Hill Descent Control (HDC) system is inoperative or warning messages are displayed. Doing so can potentially result in vehicle damage or personal injury. The HDC system restricts the vehicle’s speed to a set limit when traveling downhill. The HDC button is located on the center console. Use the steering wheel control buttons to adjust the speed limits for the HDC system.
Operate the HDC system as follows:
The HDC system is automatically selected by some of the terrain response driving programs.
The HDC system is automatically deselected if the ignition is switched off for more than 6 hours.
Each gear has a predetermined maximum speed.
The vehicle’s speed only increases on a slope steep enough to increase momentum. Using the SET+ button may not increase the vehicle’s speed on a gentle slope.
Each gear has a predetermined minimum speed.
When the HDC system is enabled, the instrument panel displays a graphic showing the current set speed. The graphic also indicates the range of set speeds available for the current transmission gear selection.
The HDC system does not operate when Park (P) is selected. In this event, the instrument panel graphic illuminates gray. If the HDC system is deselected while operating, the warning lamp extinguishes. HDC operation fades out, allowing the vehicle’s speed to gradually increase. The HDC system only operates at vehicle speeds of less than 31 mph (50 km/h). At higher vehicle speeds, HDC operation is suspended. The instrument panel graphic illuminates gray and a warning message is displayed. The HDC warning lamp also flashes.
If the vehicle’s speed exceeds 50 mph (80 km/h), the HDC system is disabled. The instrument panel displays a message and extinguishes the HDC warning lamp. If the brake pedal is pressed when the HDC system is active, a pulsation might be felt through the brake pedal. When the brake pedal is released, HDC operation resumes. If an HDC system fault is detected, the instrument panel displays a warning message indicating that the HDC system is not available. In this event, contact a retailer/authorized repairer as soon as possible. If a fault is detected during the operation of the HDC system, the HDC operation fades out.
The Gradient Release Control (GRC) system operates when the vehicle is pulling away from a standstill on an incline or a decline. When the vehicle’s brakes are released, the GRC system automatically delays and graduates the brake release to allow the vehicle to pull away smoothly. The GRC system automatically operates in forward and reverse gears. No driver intervention is required. If the brakes are applied with the Hill Descent Control (HDC) system enabled, the GRC system activates to allow a smooth transition into HDC operation. The GRC system does not operate if the terrain response sand driving program is enabled. See SAND.
In extreme circumstances, prolonged use of the Hill Descent Control (HDC) system may cause excessive brake temperatures. In this event, the instrument panel displays a warning message, indicating that the HDC system is temporarily unavailable. HDC operation fades out and becomes temporarily inactive. When the brake temperatures have returned to normal, the instrument panel warning message extinguishes and HDC operation resumes.
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