Driver/Vehicle Information Display: Description and Operation
Information and Message Center
COMPONENT LOCATION
OVERVIEW
The message center is a Liquid Crystal Display (LCD) located in a central position in the instrument cluster. The message center displays system and vehicle status information to the driver.
NOTE:
Vehicles before 2010 MY: The message center is fitted to high line instrument clusters only.
NOTE:
Vehicles from 2010 MY: the message center is fitted as standard to all vehicles.
The instrument cluster receives message center data from the Central Junction Box (CJB) over the medium speed Controller Area Network (CAN) bus. The CJB generates this data based on medium and high speed CAN bus inputs and hardwired inputs received from various system control modules. Software contained within the instrument cluster converts the data from the CJB into display messages for the driver.
DISPLAY MODES
The message center has 8 different display modes as shown in the table below.
Display Mode 0
This mode is entered when the ignition is switched off and the CAN bus network is asleep. No characters or symbols are displayed when in this mode. The mode is exited when either power mode 6 (ignition on) is active or the driver enters the customer configuration 'Information' mode.
Display Mode 1
This mode is entered when power mode 6 is first active. The full screen message 'SYSTEM CHECK IN PROGRESS' is displayed for approximately 3 seconds while the instrument cluster carries out an internal diagnostic routine. After the 3 second time period, display mode 2 will become active. If during the 3 second period the ignition is switched off, the message center will revert back to display mode 0.
Display Mode 2
This is the normal operating mode of the message center and will automatically become active after display mode 1.
Display Mode 3
This mode is entered by pressing the trip computer button when the message center is in display mode 2. Trip computer information will be displayed for 20 seconds after which time the display will revert back to display mode 2.
Display Mode 4
This mode is entered automatically if the message center receives warning or status messages from the CJB. The whole screen is used to display warning/status messages, over writing the ambient air temperature (display mode 2) and trip computer (display mode 3) information. Warning messages are displayed for 3 seconds, after which the display will return to the previous display mode (2 or 3). Status messages do not extinguish until the status is rectified, for example screen wash is added to the windshield washer bottle to remove the 'LOW WASHER FLUID' message. If more than 1 status message is present, the screen will scroll through each message at 3 second intervals.
All current warning/status messages are scrolled through at 3 second intervals when the vehicle first enters power mode 6, and when the ignition is switched off. These are displayed in order of priority, the most important message being displayed first.
Display Mode 5
Display mode 5 is entered when Terrain Response is selected. This mode has 3 formats. Format 5A displays the same information as display mode 3 with the addition of a Terrain Response icon in the top left hand (LH) corner of the screen, and a steering wheel direction icon displayed centrally at the top of the screen.
Depending on the Terrain Response CAN message received from the CJB, the screen will enter either display mode 5B or display mode 5C. When in display mode 5B the whole screen will be used to display Terrain Response messages, over writing the information shown in mode 5A.
If the screen adopts display mode 5C the top third of the screen will display all Terrain Response option icons. The lower two thirds of the screen will display Terrain response messages.
The instrument cluster provides a feedback signal to the Terrain Response control module informing it that the relevant Terrain Response information is being displayed. The Terrain Response messages for all 3 display mode 5 formats can be overwritten however if the message center receives a high priority warning/status message. If the message center is unable to display Terrain Response messages due to this occurrence, the instrument cluster changes the feedback signal to the control module from a value of 1 to a value of 0.
Display Mode 7
Display mode 7 is a diagnostic mode and can only be accessed using the Land Rover approved diagnostic system. The diagnostic routine can be found in '413-00 Instrument Pack and Panel Illumination' under the 'Content Model' menu.
When in display mode 7, 4 different patterns are displayed to check that all areas of the LCD are functional.
MESSAGE PRIORITY
Messages are assigned priorities which are defined by the effect on driving safely and the functional ability of the vehicle. New messages are displayed accompanied by a chime from the instrument cluster sounder. The messages are divided into 3 priority groups.
Priority Group 1
This group of messages have a direct effect on the driving ability and safety of the vehicle, 'ENGINE SYSTEM FAULT' for example. This message would require an immediate reaction from the driver in response to the message. Priority 1 messages will also be accompanied by the appropriate warning indicator flashing and a continuous chime from the instrument cluster. If more than one priority 1 message is present, each message is displayed in turn at 3 second intervals.
Priority Group 2
This group of messages do not directly affect the driving ability or safety of the vehicle, 'CHECK BRAKE PADS' for example. This message must be noted by the driver and the cause rectified as soon as possible. Each of these messages is displayed once when power mode 6 is entered or when the fault occurs for a predetermined time period. These messages can be recalled by the driver by pressing the trip reset button for more than 3 seconds.
Priority Group 3
This group of messages relate to low priority messages, 'LOW WASHER FLUID' for example. Depending on the message, some messages are only shown at the end of a journey to avoid annoyance to the driver. The messages will be accompanied by a chime when the ignition is switched off to alert the driver to their presence.
MESSAGE LIST
Messages are displayed in a language appropriate for the market specification of the vehicle. The language can be changed if required using the Land Rover approved diagnostic system.
NOTE:
The list below is shown in alphabetical order.
Wheels and Tires Exhaust System - 2.2L Diesel Electronic Engine Controls - 3.2L Electronic Engine ControlsAnti-Lock Control - Stability Assist Anti-Lock Control - Stability AssistAnti-Lock Control - Stability Assist Anti-Lock Control - Stability AssistAnti-Lock Control - Stability Assist Anti-Lock Control - Stability AssistExhaust System - 2.2L Diesel Ride and Handling Optimization Ride and Handling OptimizationRide and Handling Optimization Ride and Handling OptimizationRide and Handling Optimization Ride and Handling OptimizationRide and Handling Optimization Ride and Handling OptimizationExternal Controls Description and OperationExternal Controls Description and OperationExternal Controls Description and OperationExternal Controls Description and OperationRear Drive Axle and Differential Rear Drive Axle and DifferentialExternal Controls Description and OperationRear Drive Axle and Differential Rear Drive Axle and DifferentialWheels and Tires Wheels and Tires
TRIP COMPUTER
Trip computer information is shown in the bottom half of the message center when the screen is in display mode 3.
Trip Meter
A microprocessor in the instrument cluster calculates the trip data based on a wheel speed signal broadcast by the Anti-lock Brake System (ABS) module over the high speed CAN bus. The CJB acts as a gateway and transmits the wheel speed signal to the instrument cluster over the medium speed CAN bus.
The trip meter displays the distance the vehicle has traveled since the last trip meter reset. The trip meter can be reset by pressing and holding the trip computer button for more than 1 second. The trip meter can display up to a distance of 999.9 miles or kilometers. When this figure is exceeded the trip meter starts again from 0 miles or kilometers.
The trip data is stored in the instrument cluster Random Access Memory (RAM) and will be lost if the battery is disconnected.
Average Fuel Consumption
The instrument cluster receives 2 fuel tank level readings on the medium speed CAN bus via the CJB. The instrument cluster calculates an average value of the amount of usable fuel in the tank from the 2 signals. Every 200 meters of vehicle travel the instrument cluster re-calculates this value to determine how much fuel has been used. This value is then averaged over the last 31 miles (50 kilometers) of travel and displayed in the trip computer.
The distance traveled signal originates in the ABS module and is received by the instrument cluster over the medium speed CAN bus via the CJB.
Range
The range value is calculated using the average fuel consumption value (see above) and the fuel tank level value. By dividing the fuel tank level value by the average fuel consumption value the instrument cluster can calculate the distance the vehicle can travel with the current amount of usable fuel in the tank before refilling is necessary.
Average Speed
The average speed signal is calculated using the vehicle speed signal supplied by the CJB over the medium speed CAN bus. This signal originates in the ABS module and is an average of the 4 wheel speed signals. This value is divided by the time since the last trip computer reset to calculate the average vehicle speed.
ODOMETER
The odometer is located in the speedometer and displays the total distance the vehicle has traveled. This is calculated using the same signal as that used for the trip meter.
The odometer display can show 6 characters and distances up to 999,999 miles or kilometers. The value is stored in a protected area of the instrument clusters Electronically Erasable Programmable Read Only Memory (EEPROM) every 1.2 miles (2 kilometers) of vehicle travel. When the ignition is switched off, back up odometer values are also stored in the following modules:
- CJB
- ABS module
- ECM
- Restraints Control Module (RCM)
- Driver door module
- Passenger door module.
The odometer values in these modules are sent to the instrument cluster over the medium speed CAN bus within the first 2 seconds of the vehicle entering power mode 6. If the values received are the same, the cluster determines the odometer value has not been tampered with. If any value is outside of a 186 mile (300 kilometer) window the instrument cluster stores a Diagnostic Trouble Code (DTC) and will display the majority value. The DTC can be retrieved using the Land Rover approved diagnostic system.
Vehicle Operating Modes
The vehicle has 4 operating modes, which allow certain features to be enabled and disabled:
- Normal (nor)
- Factory (fact)
- Transport (transp)
- Crash (crash)
The current vehicle operating mode, shown in parenthesis above, is displayed in the odometer for 5 seconds when the vehicle first enters power mode 6.
NOTE:
'Nor' is only displayed in the Odometer when the vehicle operating mode is changed to normal from any of the other vehicle operating modes. Under all other conditions, 'Nor' is not displayed.
The vehicle operating mode can be changed using the Land Rover approved diagnostic system.
Gear Position
The gear position indicator shows the current automatic transmission selector lever position. During normal operation the display will show P (park), R (reverse), N (neutral) and D (drive). When the transmission is operated in 'CommandShift' mode, the odometer displays the currently selected manual gear; 1, 2, 3, 4, 5 or 6.
In the event of either a CAN bus failure, or if the TCM detects a transmission overheat situation, the odometer will display the letter 'E' in the same area of the display as the 'CommandShift' selected gear information.
Supplemental Restrain System Warning Indicator
If the instrument cluster detects the Supplemental Restraint System (SRS) warning indicator has failed, the message 'SrS' will be displayed in the odometer and a DTC stored. The DTC can be retrieved from the instrument cluster using the Land Rover approved diagnostic system.
Service Interval Indicator
The Service Interval Indicator (SII) informs the driver when the next vehicle service is due. The instrument cluster monitors the distance the vehicle has traveled and the time elapsed since the last service.
If vehicle distance is the trigger for the SII, 'SERVICE' will be displayed in the odometer accompanied by a distance qualifier (either 'MILES' or 'KM' depending on the instrument cluster specification). A distance counter will also be displayed in the top Right Hand (RH) corner of the odometer. If the point at which a service is required is passed, the counter will display a negative value. When activated, the SII is displayed for 5 seconds when the vehicle enters power mode 6.
If time is the trigger for the SII, 'SERVICE' will be displayed in the odometer accompanied by a clock symbol. A counter will also be displayed in the top RH corner of the odometer. If the point at which a service is required is passed, the counter will display a negative value. Again, when activated the SII is displayed for 5 seconds when the vehicle enters power mode 6.
If both the distance and time triggers are activated, the SII will display the distance information for 5 seconds, followed by the time information for 5 seconds.
When a service has been carried out, the SII will need to be re-set. This can be done using the Land Rover approved diagnostic system or following a manual re-set procedure. The manual re-set mode is entered by carrying out the following routine:
- Press and hold the trip reset button with the vehicle stationary and in a power mode less than 6.
- While holding the trip reset button, enter the vehicle into power mode 6.
- Release the trip reset button within 10 seconds of entering power mode 6.
If the manual re-set mode has been successfully entered 'dISt' or 'DATE' will be displayed in the odometer, depending on which trigger has been activated.
To clear the 'dISt' trigger press, and hold the trip reset button for more than 5 seconds within 10 seconds of entering the manual re-set mode. If successful, 'RESET' will be displayed in the odometer for 5 seconds. If the date trigger has not been activated 'END' will then be displayed in the odometer.
NOTE:
The distance trigger will not reset if the distance the vehicle has traveled is less than 20% of the next service interval value.
If the date trigger has been activated, 'DATE' will be displayed in the odometer. To clear the trigger, press and hold the trip reset button for more than 5 seconds within 10 seconds of 'DATE' being displayed. If successful, 'RESET' will be displayed within the odometer for 5 seconds followed by 'END'. The odometer will now exit re-set mode.
AMBIENT AIR TEMPERATURE
The instrument cluster can display the ambient air temperature reading in either degrees Celsius or Fahrenheit. The ambient air temperature signal originates in the ambient air temperature sensor. The sensor is a Negative Temperature Coefficient (NTC) thermistor, and is mounted in the LH door mirror. A temperature value is calculated by the ECM and broadcast over the high speed CAN bus to the instrument cluster.
If the temperature value falls below 4°C (39°F) the message center will flash the low ambient air temperature icon 5 times. This is accompanied by a chime from the instrument cluster sounder. The low ambient air temperature icon will be repeated if the ambient air temperature rises above 6°C (43°F) then drops below 4°C (39°F) again or a new ignition cycle is started.