Jaguar XK. Manual — part 45

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Adaptive cruise control (ACC)

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Overriding the speed and follow
mode

The set speed and gap can 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 function will operate
again and vehicle speed will decrease to
the set speed, or a lower speed if follow
mode is active.

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, Park or Reverse 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 set
speed will be displayed for four seconds
and the original set speed will be
resumed, unless a vehicle ahead causes
the follow mode to become active.

Hints on driving with ACC

The system acts by regulating the speed
of the vehicle using engine control 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

WARNING

Whenever the driver is overriding
the ACC by depressing the
accelerator pedal, the ACC will

not automatically apply the brakes to
maintain separation from any vehicle
ahead.

CAUTION

RESUME should only be used if
the driver is aware of the set speed
and intends to return to it.

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• 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.

Detection beam issues

Detection issues can occur:
• When driving on a different line to the

vehicle in front 1.

• With vehicles which edge into your

lane which can only be detected once
they have moved fully into your lane
2.

• There may be issues with the

detection of vehicles in front when
going into and coming out of a bend
3.

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 and
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.

1

2

3

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185

Adaptive cruise control (ACC)

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Clearing the obstruction allows the
system to return to normal operation. If
the obstruction is present when ACC is
inactive, e.g. on initial starting or with the
ACC system switched off, the message
ACC SENSOR BLOCKED will be
displayed.

Tires other than those recommended
may have different sizes. This can affect
the correct operation of the ACC.

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 whilst
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, for instance, braking,
steering or indicating and may not initiate
the warning display if the appropriate
action has been taken early enough.

This Forward Alert feature may be
switched on or off using the Forward Alert
switch in the lower outboard knee bolster
switchpack.

When the indicator in the
message centre is on, Forward
Alert is active.

The sensitivity of the warning may be
changed:
• Press the gap decrease button when

ACC is disengaged to display and
then decrease the sensitivity of the
alert.

• Press the gap increase button to

display and then increase the
sensitivity of the alert.

Both of these alerts are accompanied by

FORWARD ALERT
message on the
message centre.

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Message centre information
messages

Message

Warning

Indicator

Priority

Indicator

Meaning

CRUISE ENGAGED

None

None

Displayed when cruise control

system is operating.

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 control or Adaptive Cruise

Control malfunction.

DRIVER INTERVENE

None

None

Action by the driver to apply the

brakes is required.

SETSPEED XXX KM/H

None

None

Speed set for Adaptive Cruise

Control.

GAP

None

None

Set the distance (time gap).

RADAR SENSOR

BLOCKED

None

None

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).

FORWARD ALERT

OFF

None

None

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

None

None

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.