Incorrect Program Usage

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.

• In any special program, except the grass/gravel/snow program, when the ignition has been in the off position continually for more than 6 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 maneuvered 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.