In addition, the control unit saves mileage and operating time in the highest gear for individual programs and in the lower gear for all programs. This information can also be read using T4. This information simplifies system diagnostics "Terrain Response" and allows you to detect misuse of the system "Terrain Response", which can lead to premature failure of nodes.
System operation "Terrain Response" depends on five subsystems. In the event of a malfunction of one of the subsystems, the system "Terrain Response" stops working even if the fault is not related to the system itself "Terrain Response". Troubleshooting the control unit and system rotary switch "Terrain Response" should only be performed if there are no obvious faults in any of the subsystems. When troubleshooting a subsystem, the system "Terrain Response" will resume normal operation after turning the ignition on and off.
Subsystem failures "Terrain Response"
When a fault is detected in a subsystem, the corresponding indicator will turn on and/or a message corresponding to the subsystem will be displayed on the instrument cluster message center display. System warning "Terrain Response" not served.
If the subsystem is faulty and the driver tries to select another program "Terrain Response" using the rotary switch or the next time the ignition is switched on, the message center display shows the message 'SYSTEM FAULT SPECIAL PROGRAMS NOT AVAILABLE' (THE SYSTEM IS FAULTY. SPECIAL PROGRAMS NOT AVAILABLE). This means that the system "Terrain Response" is faulty, but this is only caused by a subsystem fault. This message is displayed for 5 seconds after each ignition on/off cycle and reappears if the driver attempts to select a program using the system rotary switch "Terrain Response", as well as after each subsequent ignition switch-on.
NOTE: Also message "SYSTEM FAULT SPECIAL PROGRAMS NOT AVAILABLE" (THE SYSTEM IS FAULTY. SPECIAL PROGRAMS NOT AVAILABLE) can be displayed in case of a malfunction of the rotary switch or the system control unit "Terrain Response". Rotary switch and control unit faults are discussed in the next section.
System control unit "Terrain Response" cannot cause a malfunction (indicated by an indicator being turned on or a message being displayed) none of the five subsystems. Turning on a subsystem indicator and/or displaying a subsystem-related message cannot be related to the system control unit "Terrain Response" or system failure "Terrain Response".
Subsystem control units can detect CAN signal failures when communicating with the system control unit "Terrain Response". If a system error is registered "Terrain Response", subsystem control units will operate in the mode without special programs. Subsystem control units store fault codes when system CAN signal fails "Terrain Response". These faults can be read out using T4. It is useful for diagnosing the system control unit "Terrain Response" and CAN networks.
Malfunctions of the rotary switch and the system control unit "Terrain Response"
If the rotary switch of the system is malfunctioning "Terrain Response" all yellow LED symbols of the rotary switch go out (backlight stays on), and the system does not respond to the rotation of the jog dial. The message appears in the instrument cluster message center display "SYSTEM FAULT SPECIAL PROGRAMS NOT AVAILABLE" (THE SYSTEM IS FAULTY. SPECIAL PROGRAMS NOT AVAILABLE) at the time of detection of a malfunction, in the presence of a malfunction and an attempt to select a special program (if the control unit can perform this operation), and the next time the ignition is switched on.
In the event of a malfunction of the yellow LED on the rotary switch, the system "Terrain Response" still working. Each time the ignition is switched on, all special programs are switched off, with the exception of the program "Grass/gravel/snow".
Rotary switch and system control unit "Terrain Response" are a single node. If one of the components fails, the entire assembly must be replaced.
CAN bus faults
In the event of a CAN bus failure preventing normal system operation "Terrain Response", the LEDs of all symbols on the jog dial turn on and the system does not respond to the rotation of the jog dial.
If the instrument panel does not receive CAN·messages from the system control unit "Terrain Response", at the time of fault registration and each time the ignition is switched on, a message appears "SYSTEM FAULT SPECIAL PROGRAMS NOT AVAILABLE" (THE SYSTEM IS FAULTY. SPECIAL PROGRAMS NOT AVAILABLE).
User errors
The reaction to the following incorrect user actions can be taken as a system malfunction:
- Engine not running: Changing programs and displaying information messages is only possible when the engine is running.
- Program selected «Slow movement on a rocky surface», however, the top stage of the transfer case is enabled.
- An attempt is made to change a special program when the dynamic stabilization system or anti-lock braking system is on (including turning on/off the anti-lock braking system, which works when using the controlled descent system on slippery or loose surfaces).
- An attempt is made to change a special program in case of overheating of the center or rear differential.
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