2004 JAGUAR XJ Wheels

4-46 On the Road
Dynamic Stability
Control (DSC)
Unless it has been switched off, dynamic
stability control is operational whenever
the engine is running. If the system is
operating, the warning light in the
instrument cluster will flash.
The DSC system controls the anti-lock
braking system (ABS), traction control
and yaw control of the vehicle.Yaw control determines the vehicle’s
direction relative to
the driver’s inputs
(sideslip and under/ov ersteer). It applies
braking pressure to individual wheels if
excessive variation is detected.
This ensures that the vehicle follows the
driver’s intended direction of travel.
Traction control will intervene to reduce
wheel spin, by automatically reducing the
power output from the engine and
applying braking to individual wheels.
This improves acceleration, particularly
on surfaces with uneven friction,
for example, one wheel on ice the other
on tarmac.
ABS helps to prevent the road wheels
from locking and skidding during
emergency braking.
When the system is operating,
the warning light in the instrument
cluster will flash.
The dynamic stability control system can
be switched OFF by pressing the switch
on the centre console switchpack.
The warning light in the instrument
cluster will remain on and a message will
be shown to indicate that the system has
been switched OFF. If the switch is
pressed again the system will switch ON. Note:
If cruise control is engaged it will
automatically disengage if stability control
activates.
A system malfunction is indicated by the
message:
DSC NOT AVAILABLE
Warning light: Amber .
and the instrument cluster DSC warning
light will be lit.
It is safe to drive the vehicle but the
system may not activate under wheel spin
or slide conditions. Report the fault to a
Jaguar Retailer as soon as possible.
!WARNING:
1. The fact that the vehicle is fitted with Dynamic Stability Control
must never allow th e driver to be
tempted into taking risks which
could affect his/her safety or that
of other road users. In all cases it
remains the driver’s responsibility
to drive safely according to the
prevailing conditions.
2. It is recommended that when using snow chains, DSC should be
switched OFF.

On the Road 4 - 47
Anti-lock Braking
System (ABS)
This system helps to prevent the road
wheels from locking and skidding during
emergency braking, assisting the driver to
maintain full steering and directional
stability.
The factor controlling ultimate stopping
distance and cornering ability is tyre/road
adhesion.
!WARNING:
1. The fact that a vehicle is fitted with ABS must never allow the
driver to be tempted into taking
risks which could affect his/her
safety or that of other road users.
2. The addition of ABS cannot overcome the consequences of
trying to stop in too short a
distance, cornering at too high a
speed, or the risk of aquaplaning. 3. The driver should always take
road conditions into account.
A slippery road surface always
requires more braking distance
for a given speed, even with ABS.
A possible increase in stopping
distance compared to locked
wheels may occur during ABS
operation on slushy snow, gravel,
sand, or some heavily corrugated
or ridged warning sections of road
surfaces.
ABS optimises tyre/road adhesion under
maximum braking conditions though it
cannot provide increased cornering
ability. There is no need for special
braking techniques, such as ‘pumping’
the brakes, to achieve optimum braking
distances and control on poor or slippery
road surfaces. Tyres must be in good
condition to achieve maximum adhesion. During normal brakin
g the ABS will not
be activated. Howe ver, if the braking
force applied begins to exceed tyre/road
adhesion the ABS will automatically
activate, preventing the road wheels from
locking.
In these circumstances a pulsating effect
will be felt from the brake pedal
indicating that the sy stem is functioning.
The pulsating effect is due to small
fluctuations in pressure supplied to the
brakes by the system to maintain full
tyre/road adhesion.
Under severe braking on some road
surfaces tyre noise may be apparent even
though the wheels will at no time become
locked.

4-48 On the Road
ABS Monitoring
The ABS control module monitors the
ABS electrical system from ignition switch
ON to ignition switch OFF.
Any malfunction will be indicated by the
anti-lock warning light coming on.
Should a fault develo p in the ABS system,
the brake system will still operate
conventionally and with the same
standard of performance as vehicles not
equipped with ABS.
Caution: Consult a Jaguar Retailer
immediately if the warning light
comes on while driving, a system
failure is indicated.
Advice on ABS Braking
Techniques
For optimum ABS performance the
instructions on braking techniques during
ABS operation should be followed:
1. Do not release brake pressure when the pulsating effect is felt. Maintain a
constant pressure until the manoeuvre
is completed. 2. To familiarise yourself with the feel of
the brake pedal duri ng ABS braking,
practise an emergency stop
procedure, always making sure it is
safe to do so. With the seat belts fitted
to all occupants, drive the vehicle at
20 mph (32 km/h) and brake sharply.
3. ABS enables the driver to steer around obstacles during emergency braking.
However, the consequ ences of turning
sharply at high speed cannot be
overcome by the ABS.
4. Do not attempt to ‘pump’ the brakes to avoid skidding as this can interfere
with the ABS operation. The ABS will
not allow the wheels to skid under
normal road conditions.
5. The ABS will tend to keep the vehicle straight during braking. Because
braking distances may increase under
certain road conditio ns, it is necessary
to plan and make turning manoeuvres
as early as possible.
Emergency Brake Assist (EBA)
The EBA system measures the rate at
which the brake pressure increases.
If the system detect s an emergency
braking situation, EBA automatically
initiates the full br aking effect. This can
reduce stopping distances in critical
situations, which can help an
inexperienced driver to stop in the same
distance as an experienced driver.
!WARNING:
The EBA system is an additional safety
system: it is not intended to relieve
the driver of his responsibility for
exercising due care and attention
when driving.

4-58 On the Road
Vehicle Suspension
This vehicle is fitted with a fully
automatic air suspension system.
It ensures that the vehicle is always at the
correct ride height with varying load
conditions, including luggage
compartment load or when towing.
The system will automatically adjust the
amount of air in the springs to level the
vehicle. Air is supplied either from an air
reservoir or a compressor.
The compressor will run periodically to
refill the reservoir.
Changes in ambient temperature will also
have an effect on vehicle height when the
vehicle is parked.
Caution:
1. Do not overload the vehicle. Vehicle load weights are shown
on page 8 - 4.
2. A slight air loss is expected over time causing the vehicle to lower,
so do not store or place anything
under the vehicle if it is to be left
for an extended period. Speed lowering
When driving at motorway speeds,
the system will lower the vehicle to
improve aerodynamics and vehicle
stability. The suspension will
automatically return the vehicle to the
normal height when the vehicle slows.
Caution: Speed lowering is
undesirable when towing.
Only Jaguar approved towing
equipment will not allow this feature.
Warning messages
If the message ‘VEHICLE TOO LOW’ is
displayed when the ignition is switched
on, start the engine and wait for the
suspension to raise. The vehicle should
not be driven until the message is
cleared.
If the message ‘VEHICLE TOO LOW’ is
displayed when driv
ing, restrict the
vehicle speed and wait for the system to
regain the correct height and the message
will then clear. If the message is displayed
frequently, it is advisable to inform your
Retailer to have the system attended to.
If the message ‘AIR SUSPENSION FAULT’
is displayed at any time, drive with
caution. Have the vehicle checked by a
Retailer at the earliest opportunity.
Note: If your vehicle needs to be
recovered by a roadside emergency
service ensure that the vehicle is securely
lashed by the wheels and NOT the body.

4-62 On the Road
Towing a Trailer
Your Jaguar Retailer, and the main
motoring organisations 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 long periods of
uphill driving on gradients over 8%
are not undertaken.
• In high altitude mountainous regions, the thinner atmosphere can reduce
engine performance. Above 3280 feet
(1000 metres) the stipulated
maximum permitted gross train
weight must be reduced by 10% for
every 3280 feet (1000 metres) in
altitude.
• The kerbside weight of the vehicle can be found on page 8 - 4.
• When towing at the maximum permissible rear axle load keep within
legal towing speeds but in any case do
not exceed 62 mph (100 km/h). • Tyres must be inflated to the normal
(higher) pressures shown on the tyre
pressure label on the fuel filler flap.
• The recommended maximum tow-ball nose weight is shown
on page 8 - 5. Having a lower nose
weight or exceeding the maximum
nose weight limit may impair the
vehicle’s handling.
• When towing, the nose weight of the trailer and the tow-bar assembly must
be deducted from the permissible
maximum load, see page 8 - 5.
• Avoid heavy braking. As the overrun brake on the traile r is not connected
to the ABS, heavy trailer braking
could critically affect the stability of
the outfit as a whole.
• Ensure that the towing vehicle’s engine, transmission, suspension,
brakes and tyres are fully efficient and
regularly serviced. Similarly check the
wheels, tyres, brakes and wheel
bearings of the trailer. Caution:
1. When not in use, it is
recommended that the removable
tow-ball is either securely stowed
in the luggage compartment or,
preferably, not in the vehicle.
Do not leave it loose in the
vehicle.
2. It is essential that only a Jaguar tow-bar and Jaguar electrical tow-
bar kit are supplied and fitted by a
Jaguar Retailer. Contact your
Jaguar Retailer for details of
additional parts that are advised
to be fitted before towing. This is
particularly important with this
vehicle having air suspension.
If unapproved towing equipment
is used whilst towing, the air
suspension speed lowering
function will not be inhibited.
This may result in a change in
trailer weight distribution and
attitude.

6 - 8 Roadside Emergency
Spare Wheel and Jack Removal
!WARNING:
Wheels are extremely heavy.
Take care when lifting and
particularly when removing and
replacing a wheel in its storage
position in the luggage compartment.
The spare wheel and jacking equipment
are stored under the trunk floor panel.
Seepage6-4.
To remove the spare wheel, fully unscrew
the locking ring ( A). Unscrew the wing
nut below the locking ring. This allows
wheel retainer ( B) to be lifted and
removed. The wheel can now be lifted
out.

6 - 10 Roadside Emergency
!WARNING:
1. Do not attempt to lift the vehicle unless the jack head is fully
engaged in the jacking point.
2. Ensure that the parkbrake is applied.
Place the jack squarely beneath the
appropriate jacking point. Ensure that the
jack head is fully engaged. Carefully raise
the vehicle by turning the handle.
Stop jacking the vehicle when the tyre
just clears the ground. Minimum tyre lift
gives maximum vehicle stability.
Remove the wheel nuts and the wheel.
Centre badge
When changing the alloy road wheels,
transfer the centre badge to the
replacement wheel. Using the plastic
tipped end of the wheel nut wrench
handle from the inside of the wheel, push
the centre badge from its housing.
Push the centre badge into the
replacement wheel. Fitting the spare wheel
Fit the spare wheel and loosely secure
with the wheel nuts.
Using the wheel nut wrench, lightly
tighten the wheel nuts
alternately using
the sequence shown in the illustration.
Lower the jack and ti ghten the wheel nuts
alternately, DO NOT OVER TIGHTEN.
At the earliest opportunity have the
wheel nuts tightened with a torque
wrench to 92 lb.ft (125 Nm).
This torque must not be exceeded. Stowing the equipment
Stow the replaced road wheel in the
trunk.
Check that the locking ring is unscrewed
fully so that it is as close as possible to the
handle of the wheel retainer. This is to
ensure that the wheel retainer can be
fitted correctly.
Locate the wheel retainer into its mating
thread in the trunk floor and tighten it
fully, then tighten the locking ring
clockwise to secure the wheel.
Seepage6-8.
Stow the jacking equipment.
Close the trunk floor panel.
!WARNING:
When a temporary spare wheel is
fitted, drive with caution and replace
with the specified wheel and tyre as
soon as possible.

Roadside Emergency 6 - 11
Vehicle Recovery
The preferred vehicle recovery method is
by using a flat bed transporter or rear
suspended tow.
Caution:
1. If the vehicle has defective transmission, to prevent further
damage, it must be towed with
the rear wheels clear of the
ground.
2. Ensure that the recovery team do not tow with sling-type
equipment since damage to the
bodywork may result.
3. Do not tow the vehicle by suspending the front end.
Transporting
If the vehicle is being transported on a
trailer or flat bed transporter,
the parkbrake must be applied,
the wheels chocked and the gear selector
lever moved to position ‘N’ or ‘D’ but
NEVER to ‘P’.
The vehicle must be securely tied down
to the transporter or trailer, see next
page.