Land Rover Lr3 Owners Handbook 2004 Rover

							201
Hill Descent Control
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Hill Descent Control in action
HDC should be used in conjunction with an 
appropriate gear selection, see BASIC 
OFF-ROAD TECHNIQUES, 239.
During a hill descent, if engine braking is 
insufficient to control the vehicle speed, HDC 
automatically operates the brakes to slow the 
vehicle and maintain a speed relative to the 
selected gear range and the accelerator pedal 
position.
While HDC is controlling the vehicle speed, 
descent speeds can be varied using the 
steering-wheel-mounted cruise control ’+’ and 
’-’ switches, where fitted. To reduce the descent 
speed, press and hold the ’-’ switch. The vehicle 
speed at the point of switch release will become 
the new descent speed.To increase the descent speed, press and hold 
the ’+’ switch. The vehicle speed at the point of 
switch release will become the new descent 
speed. Alternatively, the descent speed can be 
adjusted by tapping the ’-’ or ’+’ switches. Each 
press of the switch will adjust the descent 
speed by approximately 0.5 km/h (0.3 mph).
Note: Each gear has a predefined minimum 
descent speed.
Note: The descent speed will only increase if 
the gradient is sufficiently steep to cause the 
vehicle to accelerate as the braking effect is 
reduced. On a shallow slope, pressing the ’+’ 
switch may result in no speed increase.
When driving off-road, HDC can be 
permanently selected to ensure that control is 
maintained. ABS and traction control are still 
fully operational and will assist if the need 
arises.
Note: With HDC selected, gear changes can be 
carried out in the normal way.
If the brake pedal is depressed when HDC is 
active, HDC is overridden and the brakes will 
perform as normal (a pulsation might be felt 
through the brake pedal). If the brake pedal is 
then released, HDC will recommence operating 
at the speed at which the brakes were released.
In extreme circumstances, the HDC system 
may cause brake temperatures to exceed their 
preset limits. If this occurs, ’HDC 
TEMPORARILY NOT AVAILABLE SYSTEM 
COOLING’ will be displayed in the message 
center. HDC will then fade out and become 
temporarily inactive. On vehicles not fitted with 
a message centre, the HDC amber warning 
indicator will flash HDC will not be available 
until the brakes reach an acceptable 
temperature, at which time the warning 
message will disappear from the message 
center and HDC will, if required, resume 
operating.
H5599L
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							Hill Descent Control
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If a fault is detected in the HDC system, ’HDC 
FAULT SYSTEM NOT AVAILABLE’ will appear in 
the display or the amber HDC warning indicator 
will illuminate if no message center is fitted. If 
the fault is detected while the system is active, 
HDC will then fade out. Do not attempt a steep 
descent when HDC is unavailable or use a very 
low gear and/or the footbrake. If a fault has 
been detected, consult your Land Rover 
Retailer at the earliest opportunity.
HDC fade-out
HDC fade-out gradually decreases the HDC 
function with the effect that the rate of hill 
descent will increase. HDC will be disabled 
completely once the descent is complete.
If required (e.g. the angle of the descent levels 
out significantly), fade-out may be achieved 
deliberately by deselecting HDC while the 
system is operating.
HDC Information indicator - GREEN
If HDC is selected and the operating conditions 
are met, the indicator will illuminate 
continuously.
If the indicator flashes while HDC is active, HDC 
operating conditions are not met.
HDC Warning indicator - AMBER
If a fault with the HDC system is detected, the 
HDC warning indicator (amber) will illuminate 
or ’HDC FAULT SYSTEM NOT AVAILABLE’ will 
appear in the message center
*.
If the brake temperatures reach a predefined 
limit, the HDC warning indicator (amber) will 
flash until the system has cooled. 
						

							203
Air Suspension
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Air Suspension
AIR SUSPENSION
The air suspension system maintains the 
correct vehicle height by controlling the 
quantity of air in the vehicle’s air springs.
Unless stated otherwise, height changes may 
only be made while the engine is running and 
the driver and passenger doors are closed.
When the air suspension system lifts the 
vehicle, it normally uses compressed air stored 
in its reservoir. The suspension will rise much 
more slowly if this reservoir is depleted due to 
repeated raising and lowering of the 
suspension.
On-road Height
The normal height for the vehicle.
Off-road Height
This is 55 mm (2 in.) higher than On-road 
height. It provides improved ground clearance 
and approach, departure and break-over 
angles, see DIMENSIONS, 341.
Off-road height can be selected at any speed up 
to 40km/h (24 mph). When the system is at 
Off-road height, the system will automatically 
select On-road height if the vehicle speed 
exceeds 50 km/h (30 mph).
Note: If Terrain Response is fitted, some of its 
programs/range combinations will adjust 
suspension height automatically
Access Height
This is 50 mm (1.9 in.) lower than On-road 
height. It provides easier entry, exit and loading 
of the vehicle.Access height can be selected at any time, but 
the system response will depend on the 
vehicle’s speed:
•If the vehicle speed is greater than 20 km/h 
(12 mph), the suspension will wait for up to 
one minute for the vehicle to slow down. If 
the vehicle does not slow down to below 
20 km/h (12 mph) within this time, the 
Access height request will be cancelled.
•If the vehicle speed is less than 20 km/h 
(12 mph), the suspension will move to a 
part-lowered height and remain at this 
height for up to one minute. If the vehicle 
does not slow down to 8 km/h (5 mph) 
within this time, the Access height request 
will be cancelled.
•If the vehicle speed is lower than 8 km/h 
(5 mph), the suspension will be lowered to 
Access height immediately.
Access height may be selected up to 40 
seconds after the ignition is turned off, 
provided that the driver’s door has not been 
opened within this time.
H5755G
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WARNING
The driver should ensure that the vehicle is 
clear of obstacles and people before lowering 
the vehicle. Remember that, for example, the 
clearance under the floor and bumpers, and 
in the wheel arches, will be 105 mm (4.1 in.) 
less at Access height than at Off-road height.
The suspension will automatically rise from 
Access height when the vehicle speed exceeds 
10 km/h (6 mph).
If Access height was selected directly from 
Off-road height, the system will return to 
Off-road height when the vehicle speed exceeds 
10 km/h (6 mph). Otherwise the system will lift 
the suspension to On-road height.
Crawl (Locked at Access Height)
This mode enables the vehicle to be driven at 
low speeds at Access height to give increased 
roof clearance in low car parks, etc.
Crawl can be selected when the vehicle speed is 
below 35 km/h (22 mph). When the vehicle is in 
Crawl, On-road height will be selected 
automatically if the vehicle speed exceeds 
40 km/h (24 mph).
Remote Operation
The remote handset is programmable to give a 
range of functions, see ’LAND ROVER’ 
BUTTON, 36. If the vehicle’s remote handset 
has been configured to operate the air 
suspension, height may be controlled remotely 
to assist in loading the vehicle or a trailer 
attachment.
The suspension height can be set anywhere 
between Off-road height and Access height. 
Normal height control will resume when the 
vehicle is driven away.
Note: Remote operation is disabled when the 
vehicle is moving.
WARNING
The handset will operate effectively from 
inside the vehicle. It is therefore important to 
keep it out of reach of children at all times.
When operating the handset from inside the 
passenger compartment, ensure that the 
underside of the vehicle has been checked for 
obstructions before lowering, and that a 
responsible adult has been posted outside the 
vehicle to supervise the lowering process.
Care should be taken with all suspension 
height changes when a trailer is attached to 
the vehicle.
Messages
When a message center is fitted to the vehicle, 
messages relating to the air suspension system 
may be displayed.
For an explanation of those messages , see 
MAIN MESSAGE CENTER, 95. 
						

							205
Air Suspension
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Using the Control
1.Raise/lower Switch
2.Raising Symbol
3.Off-road Symbol
4.On-road Symbol
5.Access Symbol
6.Lock Symbol
7.Lowering Symbol
Suspension Heights
The raise/lower switch (1) is used to move up 
or down through the suspension heights. 
Symbols (3), (4) or (5) will be lit to show the 
height selected. A symbol indicating the 
suspension height will also be displayed in the 
message center
* when Off-road, Access or 
Crawl is selected.
Symbols (2) or (7) will be lit to show the 
direction of movement. They extinguish when 
the height change movement is completed.
If a height change is requested that is not 
allowed, such as attempting to raise the height 
of the vehicle with the engine not running, 
symbols (2) and (7) will flash twice and a chime 
will sound. A message will be displayed on the 
message center
*.A flashing symbol (2) or (7) indicates that the 
system is in a waiting state or shows that it will 
automatically override the driver’s choice if 
speed criteria are exceeded.
Selecting Access Height
If Access height is selected above 20 km/h 
(12 mph), symbols (5) and (7) will flash while 
the system waits for the vehicle to slow down.
When the vehicle slows down to 20 km/h 
(12 mph), symbol (4) will extinguish as the 
system goes to the part-lowered height. 
Symbol (5) will be lit and symbol (7) will 
continue to flash.
When the vehicle slows down to 8 km/h 
(5 mph), symbols (5) and (7) will be lit. When 
Access height is reached, symbol (7) will 
extinguish.
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Selecting and Cancelling Crawl (Locked at 
Access Height)
When the suspension is at On-road or Access 
height and the vehicle speed is below 35 km/h 
(22 mph), press the raise/lower switch (1) in 
the down direction for one second. Symbol (5) 
and (6) will be lit to confirm the selection.
Crawl can be cancelled manually by pressing 
the raise/lower switch in the up direction for 
one second. Symbol (6) will extinguish.
Note: When Crawl is cancelled, the suspension 
will rise to On-road height if the vehicle speed is 
greater than 10 km/h (6 mph).
Selecting Access Height Directly from 
Off-road Height
When the suspension is at Off-road height, 
press switch (1) down, then press it again 
before symbol (7) goes out.
The system will remember to return the 
suspension to Off-road height automatically if 
the vehicle is driven above 10 km/h (6 mph).Automatic Height Change Warnings
When the suspension is at Off-road height, 
Access or Crawl, the suspension height will 
change automatically when vehicle speed 
exceeds predetermined levels.
When the suspension is at Off-road height or 
Crawl, it warns the driver that the vehicle is 
approaching a speed threshold. A chime will 
sound, a message will be displayed on the 
message center
* and the On-road symbol (4) 
and either (2) or (7) will flash.
The Off-road height speed warning is shown 
above. If the vehicle slows down, the warning 
will disappear.
H5609G
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							207
Air Suspension
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Door Open Override
If a door is opened during a height change while 
the vehicle is at rest, the height change will 
stop.
The symbol for the target height (3, 4 or 5) will 
remain lit and the lifting symbol (2) or the 
lowering symbol (7) will flash.
The height change will resume if all of the doors 
are closed within 90 seconds.Extended Mode
If the vehicle is grounded and traction control is 
induced, the system automatically pumps air 
into the air springs to raise the vehicle clear of 
the obstruction. Extended mode is activated 
automatically and cannot be selected manually.
When Extended mode is activated, symbol (3) 
will flash if the suspension is above Off-road 
height. Symbols (3) and (4) will flash if the 
suspension is between Off-road and On-road 
heights. Symbols (4) and (5) will flash if the 
suspension is between On-road and Access 
heights. A message will be displayed on the 
message center
*.
To exit Extended mode, either press the 
switch (1) briefly up or down, or drive the 
vehicle at a speed greater than 20 km/h (12 
mph).
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Suspension Freeze
If the system is attempting to change the 
suspension height and it detects that the 
suspension is prevented from moving, the 
system will freeze all movements.
This can be caused by attempting to lower the 
vehicle onto an obstacle or attempting to lift the 
vehicle against an obstruction.
The symbols behave in the same way described 
in Extended mode and the same message will 
be displayed on the message center.
* As in 
Extended mode, to exit this freeze state, either 
press the switch (1) up or down, or drive the 
vehicle at a speed greater than 20 km/h 
(12 mph).Remote Operation
The handset can be configured to operate the 
air suspension, see Customer programmable 
button, 36. Remove the starter key, turn on the 
hazard warning lamps and close all doors. 
Remote operation is not possible unless this is 
done.
Press and hold the Land Rover button (3), then 
press the Lock button (1) to raise the vehicle, or 
the Unlock button (2) to lower the vehicle. 
Movement will stop when any button is 
released.
The height will initially change slowly but, after 
three seconds, the speed will increase. While 
the height is changing, a symbol on the 
raise/lower switch will be lit according to the 
direction of movement.
If the starting height is above or below On-road 
height, movement will stop when On-road 
height is reached. Further movement can be 
achieved by releasing the buttons and pressing 
them again.
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H5613G 
						

							209
Terrain Response
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Terrain Response
TERRAIN RESPONSETM SYSTEM*
The Terrain Response system is permanently 
active, continuously providing benefits in 
traction and vehicle control. These can be 
further enhanced for specific on- and off-road 
driving conditions by the selection of special 
programs, using one simple driver interface.
This allows the driver to ’tell’ the vehicle what 
sort of terrain is to be driven over. Based on the 
selected special program, the system optimises 
the vehicle set-up for the prevailing conditions, 
providing the optimum in traction, vehicle 
control and vehicle ’composure’.
The Terrain Response special programs 
automatically bring in changes in vehicle drive 
and suspension systems that have until now 
been only individually and manually 
controllable by the driver.The suspension and drive systems comprising 
Terrain Response are:
•Engine management
•Gearbox management
•Intelligent differential control
•Dynamic stability, traction control and HDC 
systems
•Air suspension
The system will provide a variable throttle 
response, ranging from very cautious for 
slippery conditions (where a large pedal 
movement has only a small effect on engine 
power) to very responsive, for example, for 
sand, where engine power is allowed to rise 
more quickly.
This further extends the breadth of off-road 
capability of Land Rover vehicles. In addition, 
Terrain Response offers control of systems that 
have previously not been manually controllable.
Note: Since each Terrain Response special 
program uses the optimum settings of each 
drive component - throttle response, 
suspension, transmission, etc. - relative to the 
terrain being driven over, it follows that 
changing from one special program to another 
brings in a different set of criteria.
This means that, for instance, the engine revs 
produced by the current throttle position might 
increase or decrease slightly in the new 
program, or the suspension could change 
height. The changes are not dramatic, but are 
noticeable.
To obtain the maximum benefits from the 
system, it is suggested that you first try it out in 
circumstances where any distraction will not 
affect other road users.
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Terrain Response is designed to benefit the 
driver, regardless of the level of off-road driving 
experience. The enhanced traction system, with 
the control of many system parameters through 
one simple driver input, coupled with specific 
advice from the message center, will aid drivers 
with limited off-road experience. Additionally, 
the system can back-up the skills of 
experienced drivers, who will also benefit from 
the wider performance envelope available 
through the special programs.
Using Terrain Response
The Terrain Response system is always active 
and can not be switched off. When the vehicle 
is started the system will normally start in its 
General program. Using the correct special 
program will provide benefits in how the vehicle 
can be driven over different surfaces or 
terrains. It is recommended that a special 
program be engaged whenever driving 
conditions could become difficult.
Depending on the terrain, it may be beneficial 
for the transmission to change gear under 
different speed and load conditions. Each 
special program will provide the most 
appropriate gear-shift points for the terrain, 
including the most appropriate gear to set off in 
(i.e., second, HIGH range, or third, LOW range, 
in Grass-Gravel-Snow or first, low range, when 
in Rock Crawl).
In addition to the electronically controlled 
center differential, fitted to the vehicle as 
standard, a vehicle fitted with Terrain Response 
may also be optionally equipped with an 
electronically controlled rear differential. The 
amount of slip allowed in the electronically 
controlled differentials will be optimised 
continuously, both from the point of view of 
traction and vehicle stability. Depending on the 
Terrain Response program selected, the control 
of the differentials will vary to provide the 
optimum settings.Note: Special programs should be engaged 
pro-actively - before starting to drive in 
particular conditions. They are not intended as 
a means of extracting a vehicle that has been 
driven into difficulties.
The system has been designed to instil 
confidence regarding choice of special 
program, despite the fact that conditions 
associated with each program are distinctly 
different. However, the vehicle will be very 
capable under all circumstances, even when no 
special program is selected, as some 
sub-systems will re-act to the conditions where 
possible. In case of any uncertainties about the 
most appropriate special program selection, it 
will be best to leave the system in Terrain 
Response General program until terrain 
conditions become more distinct and a 
program choice can be made with more 
confidence.
The system is of particular use when driving 
off-road, but, even here, it should be used 
pro-actively and not be used as a means of 
retrieving control.
If a Terrain Response special program has been 
selected, then the transmission can be left in 
’D’. If descending a slippery slope, 
CommandShift ’1’ or ’2’ should be considered.
WARNING
When towing, the automatic vehicle height 
rise associated with using the system in LOW 
range will be automatically prevented by the 
system. This will be indicated by a text 
message. However, this function relies on the 
fitting of a Land Rover-approved towing 
electrical socket. Failure to fit a Land 
Rover-approved towing electrical socket, or 
to follow these guidelines, may lead to the 
vehicle being raised to off-road height even 
with a trailer attached.