Selection of an inappropriate program is discouraged in the following ways:
The active program icon is continually displayed in the instrument cluster message center
The Terrain Response control module 'locks' out certain functions in some programs, e.g. , cruise control is only
available with the special programs off or grass/gravel/snow program transmission 'Sport' mode is deactivated in all
special programs.
cruise control is only available with the special programs off or grass/gravel/snow program
transmission 'Sport' mode is deactivated in all special programs.
In any special program, except the grass/gravel/snow program, when the ignition has been in the off position,
continually for more than six hours, the Terrain Response system defaults to the Special Programs off. When in the
grass/gravel/snow program, the Terrain Response system will never default to the Special Programs off. This is to
allow for drivers in cold climates where continuous use of the grass/gravel/snow program would be beneficial.
The rock crawl program is only available with the transfer box in low range.
Selection of an inappropriate program for the terrain conditions will not endanger the driver or cause damage to the vehicle.
Continued use of an inappropriate program may reduce the life of some components. The driver may notice reduced vehicle
response, with the engine and transmission being less responsive than in the special programs off. Also, in some programs,
HDC will remain on, signified by illumination of the HDC indicator in the instrument cluster. The driver may also notice
torque 'wind-up' in the center and rear differentials causing a 'braking' effect when the vehicle is manoeuvred in some
special programs.
The use of the special programs in the Terrain Response system is monitored by the Terrain Response control module
which records the mileage and time the vehicle has operated in a specific program in high and low range. This information
can be retrieved using T4 and used by the dealer technician to check customer concerns, e.g. high fuel consumption which
may be due to continued use of a certain program.
Driver Information
The instrument cluster contains a message center which displays vehicle information to the driver. The message center
contains the Terrain Response program icons which display the currently selected program. If no symbol is displayed, no
special program is selected and the system is in special programs off.
Any required changes to the subsystems are also passed to the driver in the form of indicator illumination in the instrument
cluster or appropriate messages in the message center, HDC off or air suspension height change for example.
In certain operating conditions, the Terrain Response system also displays advice or warning messages to ensure the
driver is using the vehicle to its full potential, e.g.,
Steering angle is displayed in the message center to avoid driving in deep ruts with steering lock applied
gear information is displayed to recommend a gear for slippery conditions
if the system automatically provided off road ride height, but the driver subsequently lowers the vehicle to normal
height, then the system may advise that this will cause a risk of grounding.
The messages which can be displayed in the instrument cluster message center are detailed in the Information and
Message Center section. For additional information, refer to
Information and Message Center
(413-08 )
DIAGNOSTICS
The Terrain Response control module stores information on detected Terrain Response faults and CAN errors which can be
interrogated using T4. The Terrain Response sub-systems and the instrument cluster also store fault information relating to
CAN errors from the Terrain Response control module.
The control module also stores the miles travelled and time elapsed in high range for the individual programs and in low
range for use of all programs which can also be retrieved using T4. This information aids diagnosis of the Terrain Response
system and also provides an indication of Terrain Response system abuse by the driver which can lead to premature
component failure.