Jaguar XJ (2008 year). Manual - part 40

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Cruise (Speed) Control

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Caution: 
• RESUME should only be used if the 

driver is aware of the set speed and 
intends to return to it.

• It is not recommended to resume 

set speed when a low gear is 
selected as excessive engine 
speeds will occur.

Cruise control will switch off and clear 
the memory when:
• The ignition is switched to position 0.
• A fault occurs. The cruise control 

system will switch OFF and cannot be 
used until the fault is cleared.

Cruise control automatic switch off

Cruise control will switch off but the set 
speed will remain in the memory when:
• The CANCEL button is pressed.
• The brake pedal is pressed.
• Speed falls below 26 km/h (16 mph).
• Neutral, Park or Reverse gear 

positions are selected.

• Dynamic Stability Control (DSC) is 

operating.

• The difference between the actual and 

set speed is too great.

• The vehicle reaches a maximum 

speed of 230 km/h (144 mph).

• The accelerator pedal is used to 

accelerate beyond the set speed for 
too long a period.

Adaptive Cruise Control (ACC)

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Adaptive Cruise Control (ACC)

PRINCIPLE OF OPERATION

The Adaptive Cruise Control 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.

!

WARNING:

Adaptive Cruise Control is not a 
collision warning or avoidance system. 
Additionally, Adaptive Cruise Control 
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.

The Adaptive Cruise Control 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 behind a 
cover on the left-hand side of the lower 
cooling aperture, to provide a clear view 
forward for the radar beam.
• Only use Adaptive Cruise Control 

when conditions are favourable, that 
is, straight, dry, open roads with light 
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 driver’s 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 highway.

163

Adaptive Cruise Control (ACC)

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USING ACC

The system is operated by switches 
mounted on the steering wheel. The driver 
can also intervene at any time by use of 
the brake or accelerator pedal.

The steering wheel switches operate as 
follows:

1. RESUME - to resume the set speed 

retained in memory.

2. SET - to set the speed or 

increase/decrease the set speed 
when the speed has been set.

3. CANCEL - cancels cruise control, but 

retains the set speed in memory.

4. GAP - increase or decrease.

Setting the speed

Accelerate as normal until the required 
speed is reached.

Press the SET (+) button briefly 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 set speed

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

speed and press the SET (+) button.

• Increase or decrease the speed by 

pressing and holding either the 
SET (+) or (–) button 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 briefly 
pressing the SET (+) or (–) button.

ACC operates between approximately
34 km/h and 180 km/h (20 mph and 
110 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.

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E86372

SET SPEED

80 KM(50 MPH)

(80 KM/H)

Adaptive Cruise Control (ACC)

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Entering the follow mode set gap

!

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.

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

When a vehicle ahead enters the same 
lane or a slower vehicle is ahead in the 
same lane, vehicle speed will be adjusted 
automatically until the gap to the vehicle 
ahead corresponds to the preset gap. 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 Adaptive 
Cruise Control.

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.

This is accompanied by a red warning 
indicator and 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 pressing the 
gap setting rocker switch on the steering 
wheel. 

Four gaps are available and the selected 
gap setting will be displayed on the 
message centre when the rocker switch is 
pressed. 

After the ignition is switched ON the 
default gap will be automatically selected 
ready for ACC operation.

 

GAP