2009 JAGUAR XF Brake

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
E91498

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.

Automatic speed limiter (ASL)
168

Note: The message is also displayed at other
times as an information display.
When ASL is selected and a set speed inserted,
the engine will respond normally up to the set
speed. Further accelerator pedal pressure will
not increase the vehicle speed beyond your set
speed, unless kickdown is initiated, in which
case ASL will be suspended.
Suspending ASL
ASL can be suspended by pressing the
CANCEL button ( 3). Applying sudden, rapid
acceleration (kickdown) will also suspend ASL.
Resuming ASL
If ASL has been suspended, it can be reinstated
with a single press of the RESUME button (2),
however, ASL will only reinstate if the vehicle
speed is less than the current speed set in
memory and greater than 30 km/h (18 mph).
The message centre will display an appropriate
message if the vehicle speed is too fast to
resume ASL.
Exceeding the set speed
If the set speed is exceeded, e.g. on a steep
downhill section, th e message centre will
display an appropriate message along with an
amber warning indicator. There are three categor
ies of over limit
displays:
• If the set speed is exceeded by up to 3
km/h (1.8 mph), the message centre will
display the message along with an amber
warning indicator.
• If the set speed is exceeded by more than
7 km/h (4 mph), the message centre will
display the message along with a flashing
red warning indicator.
• If the set speed is exceeded by more than
7 km/h (4 mph) for a duration of four
seconds, the message centre will display
the message along with a flashing red
warning indicator and an audible warning
tone.
Use your brakes to rectify the situation.
ASL unavailable
If ASL is not available due to a fault, the
message centre will display an appropriate
message along with an amber warning
indicator.
The message and warning indicator will display
when the driver attempts to use ASL.
When the ignition is switched off, ASL is
deactivated and any set speed is deleted from
memory.
LIMITER SET
XXX km/h (MPH)
LIMITER CANCELLED
TOO FAST TO RESUME
OVER LIMIT XXX km/h (MPH)
LIMITER NOT AVAILABLE

177
Fuel and refuelling

Sulphur content
In some countries diesel may contain higher
levers of Sulphur, wh ich could cause damage
to the vehicle, if in doubt contact a local
Dealer/Authorised Repairer for advice.
RUNNING OUT OF FUEL
Note: If the vehicle does run out of fuel, a
minimum of 4 litres (0.9 gallons) will be
required to restart the engine. The vehicle will
need to be driven 1.6-5 km (1-3 miles) in order
to reset the engine management and
monitoring systems.
Note: If the vehicle does run out of fuel,
seeking qualified assistance is advisable.
Diesel engines
Vehicles with diesel e ngines are equipped with
a system to prevent the fuel tank from
emptying completely. When the fuel reaches a
minimum level, the system will activate a
reduced power mode (i.e . the engine will not
run properly). This will be followed by the
engine stopping in a pproximately 1.6 km
(1 mile). This feature prevents the fuel system from
running dry, which could cause damage to the
vehicle. If the gauge indicates low fuel or the
warning indicator illumi
nates, the fuel tank
should be refuelled as soon as possible at the
next filling stat ion, with at least 4 litres (0.9
gallons) of fuel.
If the system protection function has activated,
the vehicle must firstly be refuelled, then
restarted using the following procedure:
1. With the brake pedal pressed, press and
hold the engine START/STOP button and
crank the engine for five seconds.
2. Release the START/STOP button.
3. With the brake pedal pressed, press and
release the START/STOP button to crank
the engine. The engine should start within
approximately five seconds.
Note: If the engine does not start, pause for ten
seconds with the ignition in convenience
mode, before re peating the procedure from the
beginning.
FUEL CUT-OFF
The fuel system cut-off forms part of the
Supplementary Restraint System (SRS) fitted
to your vehicle. Following an impact, and
depending on the severity , the fuel pump may
be switched off.
CAUTION
Your vehicle is fitted with a Diesel
Particulate Filter (DPF), the maximum
Sulphur content must not exceed 0.005%.
Using an incorrect fuel will cause serious
damage to the DPF. See DIESEL
PARTICULATE FILTER (DPF) (page 135).
CAUTION
Avoid running out of fuel. Doing so can
cause damage to th e vehicle's engine,
fuel and emission control systems.
CAUTION
Do not crank the engine for longer than
30 seconds, or damage to the fuel pump
may occur.

183
Towing

TOWING A TRAILER (V6 petrol and
diesel vehicles only)
Note: It is the driver's responsibility to ensure
that the towing vehicle, and the trailer are being
used correctly, and in accordance with
manufacturers recommendations and any
applicable legislation. Your Dealer/Authorised Repairer and main
motoring and caravanni
ng organisation can
advise you on towing, towing weight capacities
and about regulations that apply in other
countries.
The following are important points of safety,
stability and comfort, upon which further
advice should be sought:
• Maximum braked towing weight is
permissible, provided that long periods of
uphill driving on gradients over 8% are not
undertaken.
• In high altitude mount ainous regions, the
thinner atmosphere can reduce engine
performance. Abov e 1000 metres (3250
feet), the stipulated maximum permitted
gross train weight mu st be reduced by
10% for every 1000 metres (3250 feet) in
altitude.
E95507
WARNINGS
Never exceed the maximum weights
for either the vehicle, or the trailer.
Doing so can cause accelerated wear
and damage to the ve hicle. It can also
adversely affect vehicle stability and braking,
which in turn can lead to loss of control and
increased braking distance resulting in a
rollover or crash.
To preserve handling and stability,
only fit Jaguar approved towing
accessories.
Never use towing eyes or lashing
points to tow a trailer. They have not
been designed for this purpose and
doing so may cause them to fail resulting in
injury or death.
When towing, do not exceed 100
km/h (60 mph) or 80 km/h (50 mph)
if a temporary spare wheel is in use.

185
Towing

RECOMMENDED TOWING WEIGHTS
Nose/tongue weight must be the greater of
50 kg (110 lbs) or 7% of the actual trailer
weight, up to the maximum tow hitch load.
Nose/tongue weight can be measured using a
proprietary brand of nose weight indicator.
If it is necessary to increase the nose/tongue
weight up to the maximu m allowed, the vehicle
load should be reduced accordingly. This
ensures that the Gross Vehicle Weight (GVW),
and maximum rear axle load, are not exceeded.
Note: When towing the maximum permissible
gross vehicle weight can be increased by a
maximum of 100 kg (220 lb.) provided that the
road speed is limited to 100 km/h (60 mph).
Note: When calculating rear axle loading,
remember that the trailer nose/tongue weight,
the load in the vehicle's luggage area and the
weight of rear seat pa ssengers must all be
added together.
Towing weights - Australia only
The weight of a traile r must not exceed 1.5
times the towing vehicle’s weight. The
nose/tongue weight must be a minimum of 7%
of gross caravan/trai ler weight, up to a
maximum of 350 kg (722 lbs).
ESSENTIAL TOWING CHECKS
• The trailer should be parallel to the ground
when loaded and connected to the vehicle.
• When calculating the laden weight of the
trailer remember to include the weight of
the trailer, plus the weight of the load.
• If the load can be divided between the
vehicle and trailer, loading more weight
into the vehicle will generally improve
stability. Do not exceed the vehicle's
weight limits. See WEIGHTS (page 259).
• Ensure that all applic able regulations and
legislation are complied with when loading
and towing a trailer.
• Increase rear tyre pressures of the towing
vehicle to those for maximum vehicle
loading conditions.
• Ensure trailer tyre pressures are set to
trailer manufacturer' s recommendations.
• If the vehicle is loaded to maximum Gross
Vehicle Weight (GVW) the nose weight is
limited (see Towi ng weights table).
• Ensure that a suitable breakaway cable or
secondary coupling is used. Refer to the
trailer manufacturer' s instructions for
guidance.
• Ensure that the tow ball is secure.
• Check the operation of all trailer lights.
Maximum permissible
towing weights
Unbraked trailers 750 kg (1653 lb.) Trailers with
overrun brakes 1850 kg (4080 lb.)
Nose/Tongue weight 75 kg (165 lb.)
WARNING
Do not exceed the Gross Vehicle
Weight (GVW), m aximum rear axle
weight, maximum trailer weight, or
nose/tongue weight. Exceeding any of these
limits could cause inst ability and loss of
control. See WEIGHTS (page 259).
WARNING
Do not loop the breakaway cable over
the tow ball as it may slide off.