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Jaguar XK. Manual - part 44

179

Cruise control

Message centre information
displays

Message

Warning

Indicator

Priority

Indicator

Meaning

CRUISE ENGAGED

None

Displayed when cruise control

system is operating.

CRUISE OVERRIDE

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

Driver has cancelled cruise control

or is braking.

CRUISE NOT AVAILABLE

None

Cruise control or Adaptive Cruise

Control malfunction.

Adaptive cruise control (ACC)

180

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 is based on the use of a
radar sensor which projects a beam
directly forward of the vehicle so as to
detect objects ahead.

The radar sensor is mounted centrally
behind the bumper cover above the
cooling aperture, to provide a clear view
forward for the radar beam.
• Only use ACC when conditions are

favourable, that is, main roads with
free flowing traffic.

• Do not use in poor visibility,

specifically fog, heavy rain, spray or
snow.

• Do not use on icy or slippery roads.
• It is the drivers responsibility 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.

USING ACC

The system is operated by adjustment
controls mounted on the steering wheel.
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. The speed adjustment control thumb
wheel is used to set the speed, increase
(+) or decrease (-) by adjusting the thumb
wheel upwards (+) or downwards (-) until
the desired speed is obtained.

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.

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181

Adaptive cruise control (ACC)

2. Gap increase or decrease. 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.

Setting the speed

Accelerate as normal until the required
speed is reached.

Roll the speed adjustment control
upwards (+) and the vehicle speed will
then be stored in the memory and the
system engaged. The set speed will be
displayed on the message centre:

Changing the speed

There are three ways to change the set
speed:
• Accelerate or brake to the desired

speed then roll the speed adjustment
control upwards (+).

• Increase or decrease the speed by

rolling the speed adjustment control
upwards (+) or downwards (-) until the
required set speed is shown on the
message centre. The vehicle speed
will gradually change to the selected
speed.

• Increase or decrease the speed in

steps of 2 km/h (1 mph) by rolling the
speed adjustment control upwards
(+) or downwards (-) briefly until the
desired speed is obtained.

ACC operates between approximately 34
km/h and 180 km/h (21 mph and 112
mph) dependent on the country
specification.

Set speeds outside this 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.

Entering the follow mode set gap

Once a set speed has been selected, the
driver can release the accelerator and the
set road speed will be maintained.

SETSPEED

80 KM/H (50 MPH)

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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.

Adaptive cruise control (ACC)

182

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
preset gap, third gap setting. The vehicle
is now in follow mode.

The warning indicator in the
instrument panel will be
illuminated.

The message centre will display the gap
set.

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
thumb wheel switch on the steering
wheel. Four gaps are available and the
selected gap setting will be displayed on
the message centre when either button is
pressed. After the ignition is switched ON
the default gap, third gap setting, will be
automatically selected ready for ACC
operation.

Note: When the ignition is switched off
the gap setting will revert to the default
setting, third gap, when switched on
again.

Note: It is the driver’s responsibility to
select a gap appropriate to the driving
conditions.

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