2009 JAGUAR XF Warning

Cruise control
158

Message centre information displays
Message Warning IndicatorPriority
Indicator Meaning
CRUISE OVERRIDE None None Driver is pressing the accelerator pedal,
overriding Cruise Control function.
Message will disappear when accelerator
pedal is released and Cruise Control
speed is resumed.
CRUISE CANCELLED None None Driver has cancelled cruise control or is
braking.
CRUISE NOT AVAILABLE None None Cruise C ontrol or Adaptive Cruise Control
malfunction.

159
Adaptive cruise control (ACC)

PRINCIPLE OF OPERATION
The Adaptive Cruise Control (ACC) system is
designed to aid the driver to maintain a gap
from the vehicle ahead or a set road speed if
there is no slower vehicle ahead. The system is
intended to provide enhanced operation of the
vehicle when following other vehicles which
are in the same lane and travelling in the same
direction.
The ACC system uses a radar sensor, which
projects a beam directly forward of the vehicle
to detect objects ahead.
The radar sensor is m ounted centrally behind
the bumper cover above the cooling aperture,
to provide a clear view forward for the radar
beam.
USING ACC
The system is operated by adjustment controls
mounted on the steering wh eel. The driver can
also intervene at any time by use of the brake
or accelerator pedals. The steering wheel
adjustment controls operate as follows:
1. SET - Rotate the thumbwheel upwards ( +)
or downwards ( -), to increase or decrease
speed, until the desire d speed is achieved.
2. Gap increase or decr ease. Four settings
available by adjusting the thumb wheel.
3. CANCEL - Cancels but retains the set
speed in memory.
4. RESUME - Resumes the set speed after it
has been cancelled.
WARNING
ACC is not a collision warning or
avoidance system. Additionally, ACC
will not react to:
• Stationary or slow moving vehicles below
10 km/h (6 mph).
• Pedestrians or objects in the roadway.
• Oncoming vehicles in the same lane.
CAUTION
Only use ACC when conditions are
favourable (i.e. main roads with free
flowing traffic).
Do not use in poor visibility, specifically
fog, heavy rain, spray or snow.
E94163
Do not use on icy or slippery roads.
It is the drivers re sponsibility to stay
alert, drive safely and be in control of the
vehicle at all times.
Keep the front of the vehicle free from
dirt, metal badges or objects, including
vehicle front protectors, which may
prevent the sensor from operating.
Do not use ACC when entering or
leaving a motorway.
CAUTION
E97090
12
34

Adaptive cruise control (ACC)
160

Setting the speed
Accelerate as normal until the required speed is
reached.
Rotate the speed adjustment control upwards
(+) to store the vehicle speed in the memory
and engage the system.
The set speed will be displayed on the message
centre (e.g. SETSPEED 80 KM/H (50 MPH) ).
Changing the speed
There are three ways to change the set speed:
•Accelerate or brake to the desired speed
then rotate the speed adjustment control
upwards ( +).
• Increase or decrease the speed by rotating
the speed adjustment control upwards ( +)
or downwards ( -), until the required set
speed is shown on the message centre.
The vehicle speed will gradually adjust to
the selected speed.
• Increase or decrease the speed in steps of
2 km/h (1 mph) by rotating the speed
adjustment control upwards (+) or
downwards ( -) briefly until the desired
speed is obtained.
ACC operates between approximately 30 km/h
and 180 km/h (18 mph and 112 mph)
dependent on the c ountry specification.
Set speeds outside th is range will not be
captured. The ACC may apply the brakes to slow down
the vehicle to the new set speed. The new set
speed will be displayed on the message centre
until ACC is cancelled.
Follow mode gap settings
Once a set speed has been selected, the driver
can release the accelerator and the set road
speed will be maintained.
When a vehicle ahead enters the same lane or
a slower vehicle is ahead in the same lane, the
vehicle speed will be adjusted automatically
until the gap to the vehicle ahead corresponds
to the default gap setting (gap level 3). The
vehicle is now in
follow mode.
The amber warning indicator in the
instrument panel will be
illuminated.
The message centre will display the gap set.
E97091
WARNING
When in follow mode, the vehicle will
not decelerate automatically to a stop,
nor will the vehicle always decelerate
quickly enough to avoid a collision, without
driver intervention.
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161
Adaptive cruise control (ACC)

The vehicle will then maintain the constant time
gap to the vehicle ahead until:
•The vehicle ahead accelerates to a speed
above the set speed.
• The vehicle ahead moves out of lane or out
of view.
• A new gap distance is set.
If necessary, the vehicle brakes will be
automatically applied to slow the vehicle to
maintain the gap to the vehicle in front.
The maximum braking which is applied by the
ACC system is limited and can be overridden by
the driver applying the brakes, if required.
Note: Driver braking will cancel ACC.
If the ACC system predicts that its maximum
braking level will not be sufficient, then an
audible warning will sound while the ACC
continues to brake. DRIVER INTERVENE will be
displayed on the message centre. The driver
should take immediate action.
When in follow mode, the vehicle will
automatically return to the set speed when the
road ahead is clear, for instance when:
• The vehicle in front accelerates or changes
lane.
• The driver changes lane to either side or
enters an exit lane.
The driver should intervene if appropriate.
Changing the follow mode set gap
The gap from the vehicle ahead can be
decreased or increased by rolling the
thumbwheel on the stee ring wheel. Four gap
settings are available and the selected gap
setting will be displaye d on the message centre
when either ACC button is pressed. Each gap level is indicated by an
additional
chevron in front of th e vehicle icon in the
message centre (one chevron (gap level 1)
being the shortest, four chevrons (gap level 4)
being the longest). A fter the ignition is
switched on, the default gap (gap level 3) will
be automatically selected ready for ACC
operation.
Note: When the ignition is switched off, the
gap setting will revert to the default setting
(gap level 3) when switched on again.
Note: It is the driver’s responsibility to select a
gap appropriate to the driving conditions.
Overriding the speed and follow mode
The set speed and gap ca n be overridden by
pressing the accelerator pedal when cruising at
constant speed or in follow mode. If the vehicle
is in follow mode, the instrument warning
indicator will go out when the ACC is
overridden by the driver using the accelerator
and CRUISE OVERRIDE will be displayed on
the message centre. When the accelerator is
released the ACC functi on will operate again
and vehicle speed will decrease to the set
speed, or a lower spee d if follow mode is
active.
WARNING
Whenever the driver is overriding the
ACC by depressing the accelerator
pedal, the ACC will not automatically
apply the brakes to ma intain separation from
any vehicle ahead.

Adaptive cruise control (ACC)
162

Automatic low speed switch off
If the speed of the vehicle decreases below
30 km/h (18 mph), the ACC system will be
automatically switched off and the instrument
warning indicator will go out.
If the brakes were being applied by the ACC
system, they will be slowly released.
This will be accompanied by an audible
warning, and DRIVER INTERVENE will be
displayed on the message centre. The driver
must take control.
Automatic switch off
ACC will disengage, but not clear the memory
when;
• the CANCEL button ( 3) is pressed
• the brake pedal is pressed
• Neutral ( N), Park ( P) or Reverse ( R) gear
positions are selected
• Dynamic Stability Control activates.
ACC will disengage, and clear the memory
when;
• the ignition system is switched off
• maximum vehicle speed is reached
• a fault occurs in the ACC system.
Resuming the speed and follow mode
By pressing the RESUME button (4) after ACC
has been cancelled, for example, after braking,
the ACC will become active again provided that
the set speed memory has not been erased.
The original set speed will be resumed (unless
a vehicle ahead causes the follow mode to
become active) and the set speed will be
displayed in the message centre for four
seconds.
Hints on driving with ACC
The system acts by regulating the speed of the
vehicle using engine c ontrol and the brakes.
Gear changes may occur in response to
deceleration or acceleration whilst in ACC.
ACC is not a collision avoidance system.
However, during some situations the system
may provide the driver with an indication that
intervention is required.
An audible alarm will sound, accompanied by
the message DRIVER INTERVENE if the ACC
detects:
• A failure has occurred whilst the system is
active
• That using maximum ACC braking only is
not sufficient.
Note: ACC operates when the gear selector
lever is in position S or D.
Note: When engaged, the accelerator pedal
rests in the raised position. Fully release the
pedal to allow normal ACC operation.
Note: When braking is applied by the ACC, the
vehicle brake lamps will be switched on
although the brake pedal will not move.
CAUTION
RESUME should only be used if the
driver is aware of the set speed and
intends to return to it.

Adaptive cruise control (ACC)
164

Adverse weather conditions
During adverse weather conditions such as
heavy rain or snowfall, the sensitivity of radar
blockage detection is incr eased, so that it can
correctly detect any reduced performance
caused by a blocked sensor.
During these conditions, the warning message
ACC SENSOR BLOCKED may be displayed
more frequently, especially in areas where
there are few roadside objects for the radar to
detect.
FORWARD ALERT FUNCTION
Limited detection and warning of objects
ahead, is provided during ACC operation by the
ACC FORWARD ALERT warning. The enhanced
forward alert feature additionally provides
warnings when ACC is not engaged; if an object
is detected close ahead, then the warning tone
and message will be issued. The brakes will not
be applied. The forward alert system does not initiate any
action. The driver must
take appropriate action
when the FORWARD ALERT message is
displayed. However, the system monitors
driver actions (e.g. braking, steering or
indicating) and may not initiate the warning
display if the appropriate action has been taken
early enough.
The Forward alert function may be switched on
or off using the forward alert switch, located
where shown.
When the indicator in the
instrument panel is on, Forward
alert is active.
The sensitivity of the warning may be changed:
• Press the gap decrease button when ACC
is disengaged to displa y and then decrease
the sensitivity of the alert.
• Press the gap increase button to display
and then increase the sensitivity of the
alert.
FORWARD ALERT is
displayed in the
message centre.
WARNING
Do not use in poor visibility,
specifically fog, heavy rain, spray or
snow.
Do not use on icy or slippery roads.
JAG1303

165
Adaptive cruise control (ACC)

ADVANCED EMERGENCY BRAKE
ASSIST
On vehicles fitted with Advanced Emergency
Brake Assist, brake response is improved
during emergency braking when a moving
vehicle is detected close ahead.
Advanced Emergency Brake Assist activates If
the risk of collision increases after the
FORWARD ALERT warning is displayed.
See FORWARD ALERT FUNCTION (page 164).
The brakes are automatica lly applied gently in
preparation for rapid braking (which may be
noticeable). If the brake pedal is then pressed
quickly, then braking is implemented fully,
even if the pressure on the pedal is light.
See HINTS ON DRIVING WITH ABS
(page 144).
Advanced Emergency Brake Assist is available
at speeds above approximately 7 km/h (5 mph)
and will function even if Forward Alert and
Adaptive Cruise Control are switched off. A
fault with the system will be indicated by the
warning FORWARD ALER T UNAVAILABLE
appearing in the mess age centre. Advanced
Emergency Brake Assist will not be available
until the fault is rectified.
WARNING
Advanced Emergency Brake Assist, is
an additional safety system and is not
intended to relieve the driver of the
responsibility for exer cising due care and
attention when driving.
CAUTION
The system may not react to slow
moving vehicles and will not react to
stationary vehicles or vehicles not
travelling in the same direction as your vehicle.
Advanced Emergency Brake Assist can
only improve braking performance if the
driver applies the brakes.
Warnings may not appear if the distance
to the vehicle ahead is very small or if
steering wheel and pedal movements
are large (e.g. to avoid a collision).
Advanced Emergency Brake Assist
utilises the same radar sensor as
Adaptive Cruise Control and Forward
Alert - the same limita tions of performance
apply.
See PRINCIPLE OF OPERATION (page 159).
See USING ACC (page 159).
See FORWARD ALERT FUNCTION
(page 164).

Adaptive cruise control (ACC)
166

MESSAGE CENTRE INFORMATION MESSAGES
MessageMeaning
CRUISE OVERRIDE Driver is pressing the accelerator pedal overriding cruise control function. Message will disappear when accelerator pedal is released
and cruise control speed is resumed.
CRUISE CANCELLED Driver has cancelle d cruise control or is braking.
CRUISE NOT AVAILABLE Cruise control or Adaptive
Cruise Control malfunction.
DRIVER INTERVENE Action by the driver to apply the brakes is required.
SETSPEED XXX KM/H Speed set fo r Adaptive Cruise Control.
GAP Set the distance (time gap).
RADAR SENSOR BLOCKED Clean the front of the vehicle in the area of the sensor unit (the sensor
is mounted centrally behind the
bumper cover above the cooling
aperture).
This message may also appear under the following conditions:
If stone chip protect ion has been applied.
On rural roads with few roadside objects.
In heavy rain.
FORWARD ALERT OFF Forward alert feature has been switched off.
WARNING: A warning will not be given for objects detected in
the vehicle’s path of travel.
FORWARD ALERT Forward Alert feature has been switched on or the setting changed. A
warning will be given for objects detected in the vehicle path of travel.
A longer gap indicates that the system will warn when detected objects
are further away than the previous setting.
Action by the driver to ap ply the brakes is required.
FORWARD ALERT UNAVAILABLE Advanced emergency brake assist
and Forward Alert functions are
unavailable.