2009 JAGUAR XF Sensor

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.
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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
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163
Adaptive cruise control (ACC)

Detection beam issues
Detection issues can occur:
1.When driving on a different line to the
vehicle in front.
2. When a vehicle edges into your lane. The
vehicle will only be detected once it has
moved fully into your lane.
3. There may be issues with the detection of
vehicles in front when going into and
coming out of a bend.
In these cases ACC may brake late or
unexpectedly. The driver should stay alert and
intervene if necessary.
ACC malfunction
If a malfunction occurs during operation of the
system in cruise or follow modes, the ACC
system will switch off a nd cannot be used until
the fault is cleared. The message DRIVER
INTERVENE appears briefly and is then
replaced by the message CRUISE NOT
AVAILABLE . If malfunction of the ACC or any
related system occurs at any other time, the
message CRUISE NOT AVAILABLE will be
displayed. 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 affect ACC operation.
The ACC system relies on its radar to detect
objects and constantly scans ahead. If the
radar detects no objects ahead in ACC or follow
mode , then the ACC will be deactivated, the
audible alarm sounds and the message
DRIVER INTERVENE displays briefly. The
message ACC SENSOR BLOCKED will then be
displayed.
The same messages may also be displayed
while driving on open roads with few objects
for the radar to detect.
Clearing the obstruction allows the system to
return to normal operation. If the obstruction is
present when ACC is inac tive, e.g. on initial
starting or with the ACC system switched off,
the message ACC SENSOR BLOCKED will be
displayed.
Tyres other than those recommended may
have different sizes. This can affect the correct
operation of the ACC.1
2
3
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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.
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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.

Towing
184

Diesel engine vehicles
The diesel engine management system
incorporates sensors to determine optimum
performance. It is also designed to protect the
engine when arduous conditions are
encountered during towing. When ambient
temperature exceeds 40°C (104°F), the engine
coolant temperature may increase above
normal operating level. If this occurs, the
management system will initiate a series of
actions to restore norma l operating conditions.
The actions may include:
• A message centre message.
• Engine performance reduction.
• Air conditioning syst em cycling. The
system temperature output will fluctuate
between hot and cold, in order to dissipate
engine heat. If engine overheat persists,
the air conditioning will move to
continuous heat output.
It is advisable to bring the vehicle and trailer to
a convenient stop and allow the engine to idle
until normal temperature is restored. Do not
turn off the engine.
Trailer electrical connection
Note: The rear parking sensors are
automatically disabled when the trailer
electrical conne ction is made using Jaguar
approved towing equipment.
The vehicle's electrical system has been
designed to support all towing requirements,
and comply with legal requirements for the
specific territory in which the vehicle is first
sold.
LEVELLING
To maintain vehicle stabilit y, it is essential that
the trailer is loaded so that it remains parallel to
the ground. This is particularly important when
towing twin axled trailers.
CAUTION
Only connect appr oved electrical
circuits, which are in good condition to
the trailer socket. Connecting incorrect, or
faulty circuits may seriously damage the
vehicle's electrical circuits.
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Wheels and tyres

Note: Different types of tyre may affect the
performance of the TPM system. Always
replace tyres in accordance with
recommendations. See TYRE
SPECIFICATIONS - ARDUOUS TERRAIN
(page 239).
Your vehicle may be equipped with a TPM
System which monitors pressure in each tyre
(temporary use spare wheels are not fitted with
sensors and are conseque ntly not monitored).
Wheels fitted with a TPM system can be easily
visually identified by the external metal lock nut
and valve ( 1). All Jaguar n on-TPM system
wheels have a rubber valve fitted (2).
TPM system operation
The TPM system monitors pressure of the
tyres via sensors located in each wheel and a
receiver located within the vehicle.
Communication between se nsor and receiver
is via Radio Frequency (RF) signals.
The tyre pressure warning
comprises a yellow warning telltale
within the instrument panel, and
the associated messages within the message
centre. If the telltale light illu
minates, you should stop
and check your tyres as soon as possible and
inflate them to the recommended pressure as
stated on the tyre pressure placard. If low
pressure warnings occur frequently, the cause
must be determined and rectified.
When driving through variable climatic
conditions the TPM syst em warnings may be
intermittent.
Your vehicle will also indicate a TPM System
malfunction by initially flashing and
subsequent continuous illumination of the
warning telltale. A text message will
accompany the system malfunction and will
display TYRE PRESSURE SYSTEM FAULT . The
TPM system fault sequence will be activated at
every ignition cycle until the fault is rectified.
When a malfunction occurs, the system may
not be able to de tect or signal low tyre pressure
as intended.
TPM system malfuncti ons may occur for a
variety of reasons which may include other
radio frequency systems that could cause
interference or the installation of incompatible
replacement tyres on the vehicle.
1
2
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Wheels and tyres
236

Tyre pressure warning with speed
If the vehicle is to be driven at speeds in excess
of 160 km/h (100 mph), the tyre pressures
should be increased as stated in this handbook
or on the placard label. Failure to increase the
tyre pressures and driving in excess of
160 km/h (100 mph), will illuminate the yellow
warning telltale and display a text message
TYRE PRESSURES LOW FOR SPEED . In the
event of this warning be ing displayed, vehicle
speed should be reduced
Temporary use spare wheel and tyre
change
If the temporary use spare wheel is fitted the
system will automatically recognise the change
in wheel positions. The n after approximately
ten minutes of driv ing above 25 km/h
(18 mph), a message TYRE NOT MONITORED
will be displayed accompanied by illumination
of the warning telltale and the corresponding
block in the vehicle graphic.
The warning telltale will initially flash and will
subsequently revert to continuous illumination.
Extended use of the temporary use spare wheel
will produce an additional text message TYRE
PRESSURE SYSTEM FAULT .
This TPM system display sequence will be
activated at every ignition cycle until the
temporary use spare wheel is replaced by a
fully operational full size wheel and tyre
assembly.
Always replace the temporary use wheel before
having TPM system faults investigated. The
fault may well be rectified with the fitment of a
fully operational full size running tyre in lieu of
the temporary use spare wheel assembly.
Tyre changing
Always have your tyres serviced or changed by
a qualified engineer.
Care must be taken to avoid contact between
the bead of the tyre and the sensor during
removal and refitting of the tyre, otherwise the
sensor may become damaged and or
inoperable.
Sensors can be removed from the wheel by the
unscrewing of the va lve retention nut.
Replacement sensor
Should the sensor require replacing, it should
be carried out by a Dealer/Authorised Repairer.
A replacement sensor must be fitted to a
running wheel in order to be recognised by the
system. The vehicle needs to be stationary for
15 minutes during the se nsor fitment before
the system is ready to detect the new sensor.
The vehicle must be driven for a minimum of
fifteen minutes after the sensor change, and
then remain stationary for fifteen minutes to
activate full TPM system operation.
If the TPM system warning for any wheel does
not clear, even after ensuring correct inflation
and driving for more than ten minutes above
25 km/h (18 mph), you should seek qualified
assistance as soon as possible.
CAUTION
Valve stem seal, washer, nut, valve core
and cap should be replaced at every tyre
change. Valve stem seal, washer and nut must
be replaced if valve re tention nut is loosened.
Sensor units and nuts must be refitted using
correct torque figures and associated profile.
Damage to the vehicle may result if these
precautions are not taken.