2011 Jeep Grand Cherokee User Guide - Page 60

OFF-ROAD CAPABILITIES • Sand/Mud - Off-road calibration for use on low traction surfaces such as mud, sand, or wet grass. Driveline is maximized for traction. Some binding may be felt on less forgiving surfaces. The electronic brake controls are set to limit traction control management of throttle and wheel spin. • Rock - Off-road calibration only available in 4WD Low range. The vehicle is raised (if equipped with Air Suspension) for improved ground clearance. Traction based tuning with improved steer-ability for use on high traction off-road surfaces. Activates the Hill Descent Control for steep downhill control. Use for low speed obstacles such as large rocks, deep ruts, etc. • The Quadra-Lift™ air suspension system uses a lifting and lowering pattern which keeps the headlights from shining into oncoming traffic. When raising the vehicle, the rear of the vehicle will move up first and then the front. When lowering the vehicle, the front will move down first and then the rear. • After the engine is turned off, you may notice that the air suspension system operates briefly. This is normal. The system is correcting the position of the vehicle. • To assist with changing a spare tire, the Quadra-Lift™ air suspension system has a feature which allows the automatic leveling to be disabled. Press and hold both the "Up" and "Down" buttons simultaneously between 5 and 10 seconds; a message will appear in the EVIC stating leveling has been disabled immediately after both buttons have been released. Driving the vehicle over 5 mph (8 km/h) will return the air suspension to normal operation. • An audible chime will be heard whenever a system error has been detected. Operation • Pressing the "Up" or "Down" button once will move the suspension one position higher or lower from the current position, assuming all conditions are met (i.e., engine running and all doors and liftgate closed). • The 4 indicator lamps will illuminate to show the current position of the vehicle. Flashing indicator lamps will show a position which the system is working to achieve. If multiple indicator lamps are flashing on the "Up" button, the highest flashing indicator lamp is the position the system is working to achieve. Quadra-Lift™ • The Quadra-Lift™ air suspension system provides full time load leveling capability along with the benefit of being able to adjust vehicle height by the push of a button. Quadra-Lift™ is available with both Quadra-Trac II® and Quadra-Drive II™. • The system requires that the engine be running for all changes. When lowering the vehicle all of the doors, including the liftgate, must be closed. 58