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Adaptive Cruise Control (ACC) R Adaptive Cruise Control (ACC) Adaptive Cruise Control (ACC) INTRODUCTION The radar sensor is mounted behind a Where fitted, the adaptive cruise control cover on the left-hand side of the lower system is designed to aid the driver to cooling aperture, to provide a clear view maintain a gap from the vehicle ahead or forward for the radar beam. a set road speed if there is no slower • Only use adaptive cruise control when vehicle ahead. The system is intended to conditions are favourable, that is, provide enhanced operation of the vehicle straight, dry, open roads with light when following other vehicles which are in traffic. the same lane and travelling in the same • Do not use in poor visibility, direction. specifically fog, heavy rain, spray or snow. ! WARNING: • Do not use on icy or slippery roads. Adaptive cruise control is not a • It is the driver’s responsibility to stay collision warning or avoidance system. alert, drive safely and be in control of Additionally, adaptive cruise control the vehicle at all times. will not detect: • Keep the front of the vehicle free from • Stationary or slow moving vehicles dirt, metal badges or objects, below 10 km/h (6 mph). including vehicle front protectors, • Pedestrians or objects in the which may prevent the sensor from roadway. operating. • Oncoming vehicles in the same • Do not use ACC when entering or lane. leaving a motorway. The adaptive cruise control system is based on the use of a radar sensor which projects a beam directly forward of the vehicle so as to detect objects ahead. 153 L Adaptive Cruise Control (ACC) The system is operated by switches OPERATION mounted on the steering wheel. The driver can also intervene at any time by use of Setting the vehicle speed the brake or accelerator pedal. Accelerate as normal until the required speed is reached. Press the SET (+) button briefly and the vehicle speed will then be stored in the memory and the system engaged. The set speed will be displayed on the message V V centre. I V V V I I I V SET SPEED (50 MPH) (80 KM/H) Entering the follow mode The steering wheel switches operate as follows: ! WARNING: 1. RESUME - to resume the set speed When in follow mode, the vehicle will retained in memory. not decelerate automatically to a stop, nor will the vehicle always decelerate 2. SET - to set the speed or quickly enough to avoid a collision increase/decrease the set speed without driver intervention. when the speed has been set. Once a set speed has been selected, the 3. CANCEL - cancels cruise control but driver can release the accelerator and the retains the set speed in memory. set road speed will be maintained. 4. GAP - increase or decrease. When a vehicle ahead enters the same lane or a slower vehicle is ahead in the same lane, vehicle speed will be adjusted automatically until the gap to the vehicle ahead corresponds to the preset gap. The vehicle is now in follow mode. The warning light in the instrument cluster will be illuminated, and the message GAP centre will display the gap. 154 R Adaptive Cruise Control (ACC) The vehicle will then maintain the Low speed automatic switch off constant time gap to the vehicle ahead If the speed of the vehicle decreases until: below 30 km/h (18 mph), the ACC system • The vehicle ahead accelerates to a will be automatically switched OFF and speed above the set speed. the instrument cluster warning light will go • The vehicle ahead moves out of lane out. or out of view. If the brakes were being applied by the • The vehicle ahead slows so that low ACC system, they will be slowly released. speed automatic switch off occurs. This will be accompanied by an audible • A new gap distance is set. warning, a red warning light and DRIVER INTERVENE will be displayed on the If necessary, the vehicle brakes will be message centre. The driver must take automatically applied to slow the vehicle control. to maintain the gap to the vehicle in front. The maximum braking which is applied by Overriding the set speed/ follow mode the ACC system is limited and can be overridden by the driver applying the ! WARNING: brakes, if required. Whenever the driver is overriding the Note: Driver braking will cancel adaptive ACC by depressing the accelerator cruise control. pedal, the ACC will not automatically If the ACC system predicts that its apply the brakes to maintain maximum braking level will not be separation from any vehicle ahead. sufficient, then an audible warning will The set speed and gap can be overridden sound while the ACC continues to brake. by pressing the accelerator pedal when This is accompanied by a red warning cruising at constant speed or in follow light and DRIVER INTERVENE will be mode. displayed on the message centre. If the vehicle is in follow mode, the The driver should take IMMEDIATE instrument cluster warning light will go out action. when the ACC is overridden by the driver When in follow mode the vehicle will using the accelerator and CRUISE automatically return to the set speed OVERRIDE will be displayed on the when the road ahead is clear, for instance message centre. when: When the accelerator is released the ACC • The vehicle in front accelerates or function will operate again and vehicle changes lane. speed will decrease to the set speed, or a • The driver changes lane to either side lower speed if follow mode is active. or enters an exit lane. The driver should intervene if appropriate. 155 L Adaptive Cruise Control (ACC) Changing the set speed Note: It is the driver’s responsibility to There are three ways to change the set select a gap appropriate to the driving speed: conditions, and in accordance with national driving regulations. • Accelerate or brake to the required speed and press the SET (+) button. ACC automatic switch off • Increase or decrease the speed by Adaptive cruise control will disengage, pressing and holding either the but not clear the memory when: SET (+) or (–) button until the required • The CANCEL button is pressed. set speed is shown on the message • The brake pedal is pressed. centre. The vehicle speed will gradually change to the selected • The vehicle speed falls below speed. 30 km/h (18 mph). • Increase or decrease the speed in • Neutral, Park or Reverse gear steps of 2 km/h (1 mph) by briefly positions are selected. pressing the SET (+) or (–) button. • Dynamic Stability Control (DSC) is ACC operates between approximately activated. 34 km/h and 180 km/h (20 mph and Adaptive cruise control will disengage 110 mph) dependent on the country and clear the memory when: specification. • The ignition switch is set to Set speeds outside this range will not be position 0. captured. • Maximum vehicle speed is reached. The ACC may apply the brakes to slow • A fault occurs in the ACC system. down the vehicle to the new set speed. The new set speed will be displayed on Resuming the set speed/follow mode the message centre until ACC is By pressing the RESUME button after cancelled. ACC has been cancelled, for example, after braking, the ACC will become active Changing the gap again provided that the set speed The gap from the vehicle ahead can be memory has not been erased. decreased or increased by pressing the gap setting rocker switch on the steering The set speed will be displayed for four wheel. seconds and the original set speed will be resumed, unless a vehicle ahead causes Four gaps are available and the selected the follow mode to become active. gap setting will be displayed on the message centre when the rocker switch is Caution: RESUME should only be used pressed. if the driver is aware of the set speed and intends to return to it. After the ignition is switched ON the default gap will be automatically selected ready for ACC operation. 156 R Adaptive Cruise Control (ACC) Forward alert ACC failure Limited detection and warning of objects If a fault occurs during operation of the ahead is provided during ACC operation system in cruise or follow modes, the by the ACC DRIVER INTERVENE ACC system will switch OFF and cannot warning. be used until the fault is cleared. The forward alert feature additionally A red warning light and the message provides warnings whilst ACC is not DRIVER INTERVENE appear briefly, and engaged; if an object is detected close are then replaced by an amber warning ahead then a warning tone and message light and the message CRUISE NOT will be issued. The brakes will not be AVAILABLE. applied. If failure of the ACC or any related system occurs at any other time an amber warning light will be displayed accompanied by the message CRUISE NOT AVAILABLE. It will not be possible to activate the ACC system in any mode. Accumulations of dirt, snow or ice on the sensor or cover may inhibit ACC operation. Fitting of a vehicle front protector or metallised badges may also This additional feature may be switched affect ACC operation. on or off using the forward alert switch in If this occurs in ACC cruise/follow mode, the lower outboard knee bolster the red warning light is displayed, the switchpack. When the indicator lamp in audible alarm sounds and the message the switch is on, forward alert is active. DRIVER INTERVENE appears briefly. The sensitivity of the warning may be These warnings are then replaced by the changed: amber warning light and the message ACC SENSOR BLOCKED is displayed.
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