Jaguar XK. Manual - part 45

183

Adaptive cruise control (ACC)

R

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.

Adaptive cruise control (ACC)

184

L

• 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

E91498

185

Adaptive cruise control (ACC)

R

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.

E91499

Adaptive cruise control (ACC)

186

L

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.