Part 2
Instrument Cluster
Low Brake Fluid
^ The brake fluid reservoir is fitted with a sensor which is connected directly to the instrument cluster. When the ignition is switched on to position II the fluid level is checked. To prevent incorrect warnings when the vehicle is moving, the sensor is monitored once every 25 seconds. If a low fluid situation occurs, the instrument cluster illuminates the brake warning indicator in a red color and on high line instrument clusters also displays the message 'CHECK BRAKE FLUID' in the message center. Illumination of the indicator for low fluid level is also accompanied by a chime from the instrument cluster.
16.Anti-lock Brake System (ABS) Indicator
The ABS indicator is controlled by the ABS module which transmits a CAN signal to the instrument cluster. The indicator is illuminated in an amber color for 3 seconds for a bulb check by the ABS module when the ignition is moved to position II. If the indicator remains illuminated or illuminates when driving, an ABS fault has occurred an the ABS function will not be available.
During the bulb check, if the indicator comes on for 0.5 second, then goes off for 0.5 second and is then illuminated for the remaining 2 seconds of the bulb check, this indicates that faults are stored in the ABS module memory.
If the indicator was illuminated due to a sensor fault, the indicator will remain illuminated at the next ignition cycle, even if the fault is rectified. When the vehicle is driven above a speed of 20 km/h (12.5 mph) the indicator will be extinguished. This allows the ABS module to perform a thorough check of the system and to establish that the output from the replaced sensor is correct.
17.Cruise Control Indicator
The cruise control indicator is controlled by the ECM and the instrument cluster on receipt of CAN signals from the ECM. When the cruise control is selected on, the indicator is illuminated providing that cruise has been resumed and is not within 8 km/h (5 mph) of the set speed or cruise is on and the vehicle speed is within 8 km/h (5 mph).
18.Adaptive Front Lighting System (AFS) Indicator
The AFS indicator is controlled by the AFS control module and the instrument cluster software on receipt of CAN signals from the control module. The indicator is illuminated in an amber color for a 3 second bulb check when the ignition is moved to position II.
The AFS indicator displays AFS system failures to the driver. If a failure occurs, the indicator will flash continuously until the fault is rectified.
19 and 25.Park Brake Fault Indicator
The park brake fault indicator is controlled by the instrument cluster software on receipt of CAN signals from the Electronic Park Brake (EPB) control module. The indicator is illuminated in an amber color for 3 second for a bulb check when the ignition is moved to position II. If a fault occurs in the EPB system occurs, the EPB control module requests illumination of the indicator which remains illuminated until the fault is rectified.
20 and 26.Park Brake Warning Indicator
The park brake warning indicator is controlled by the instrument cluster software on receipt of CAN signals from the Electronic Park Brake (EPB) control module. The indicator is illuminated in a red color when the park brake is applied. If the ignition is moved to the off position, the indicator remains illuminated for 3 minutes. If a fault occurs which prevents park brake application the indicator flashes and the park brake fault indicator is also illuminated.
21.Front Fog Lamps Indicator
The front fog lamp indicator is controlled by the CJB which illuminates the indicator via a hardwired connection to the instrument cluster. The lamp is illuminated in a green color at all times when the front fog lamps are selected on and the ignition is in position II.
22.Rear Fog Lamps Indicator
The rear fog lamp indicator is controlled by the CJB which illuminates the indicator via a hardwired connection to the instrument cluster. The lamp is illuminated in an amber color at all times when the rear fog lamps are selected on and the ignition is in position II.
23.Trailer Indicator
The trailer indicator is controlled by the instrument cluster software on receipt of CAN signals on the medium speed CAN bus from the Central Junction Box (CJB). When a trailer is connected to the vehicle electrical system and the turn signal indicator switch is operated, the CJB transmits a signal to the instrument cluster to operate the trailer indicator. The instrument cluster software controls the flash rate of the indicator which flashes in a green color. The trailer indicator flashes slowly, accompanied simultaneously by a sound from the instrument cluster sounder, at the same rate as the turn signal indicators.
24.Auxiliary Heating Indicator
The auxiliary heating indicator is illuminated in an amber color for a 3 seconds bulb check when the ignition is moved to position II. The indicator is for later fitment of the auxiliary heating system and therefore is only illuminated for the bulb check.
28.Adaptive Speed Control Indicator (if fitted)
The adaptive speed control indicator is controlled by the adaptive speed control module and the instrument cluster software. The indicator is illuminated when cruise control is active and another vehicle is detected by the radar system in front of the vehicle. The indicator is illuminated in an amber color to alert the driver that the adaptive speed control system is active and will automatically control the vehicle speed to maintain a set distance from the vehicle in front.
Analogue Instruments
The analogue instruments located in the instrument cluster are as follows:
^ Speedometer
^ Tachometer
^ Fuel level gage
^ Engine coolant temperature gage.
The speedometer, tachometer, fuel gauge and engine temperature gauge are each driven by an electronic stepper motor. The characteristics of this type of motor produce damping of the pointer needle. All of the gages return to their respective zero positions when the ignition is switched off.
Speedometer
The speedometer is driven by square wave signals derived from the wheel speed sensors and the ABS module. The wheel speeds are measured by the wheel speed sensors reading the rotational speed of the wheels from toothed targets on the hubs. The wheel speeds are passed from the sensors to the ABS module in the form of pulsed signals. The ABS module converts these signals into a speed output on the high speed CAN to the instrument cluster.
Three versions of the speedometer display are used. The three versions show the speed in kilometers per hour, the speed in miles per hour as the main display and kilometers per hour as a secondary display and Canadian variants show the kilometers per hour as the main display and miles per hours as the secondary display.
Tachometer
The tachometer is driven by an engine speed signal transmitted on the high speed CAN from the ECM. The signal is derived from the Crankshaft Position (CKP) sensor. The signal is received by the instrument cluster microprocessor and the output from the microprocessor drives the tachometer.
Two versions of the tachometer are used for petrol and diesel engine variants. The petrol engine variants use a display which has a maximum engine speed reading of 8000 rev/min. The diesel engine variants use a display which has a maximum engine speed reading of 6000 rev/min.
Fuel Level Gage
The fuel level gage displays the fuel tank contents. When the ignition is off, the pointer returns to the empty position.
The instrument pack is connected to two tank level sensors. One sensor is located at the front of the fuel tank and the other is located at the rear. Each sensor uses a float operated Magnetic Passive Position Sensor (MAPPS) for measuring the fuel tank contents.
Each sensor is supplied with a reference current from the instrument cluster. The instrument cluster measures the returned output from each sensor which is proportional to the amount of fuel in the tank and the position of the float arm. The inclination of the vehicle, derived from a CAN message from the Electronic Park Brake (EPB) module, is also used to calculate the fuel tank contents. The instrument cluster uses the fuel level sensor signals and the EPB module inclination signals to accurately calculate the volume of fuel in the tank and display this on the fuel level gage. The instrument cluster monitors the signals and updates the fuel level gage pointer position at approximately 20 second intervals. This prevents the pointer moving continually due to fuel movement in the tank due to cornering or braking. When the ignition is off, the pointer needle returns to the empty position.
A warning lamp is incorporated into the fuel level gage and illuminates when the fuel tank volume is at or below 12.5 liters (2.75 Gallons) on petrol models and 14 liters (3.69 Gallons) on diesel models. This is accompanied by a chime from the instrument cluster and a message alert the driver to the low fuel condition.
The fuel tank content is converted into a CAN signal by the instrument cluster and transmitted on the CAN. This is received by Fuel Fired Booster Heater (FFBH) control module (if fitted) to suspend operation of the FFBH on diesel variants when the fuel tank content reaches 14 liters or less.
The following table shows the fuel tank fuel quantity and the respective pointer positions.
Fuel Tank Quantity (Liters) Needle Pointer Position
4.91 Empty
12.5 Low fuel (low fuel lamp illuminated - Petrol engines)
14 Low fuel (low fuel lamp illuminated - Diesel engine)
25.6 Quarter full
45.8 Half full
67 Three quarter full
81.05 Full
Engine Coolant Temperature Gage
The engine coolant temperature gage displays the engine coolant temperature to the driver. When the ignition is off the pointer needle returns to the cold position.
The engine coolant temperature sensor is connected to the ECM which monitors the sensor signals and converts the signals into a value for the engine coolant temperature. This information is transmitted on the high speed CAN for use by the instrument cluster and other systems.
The engine coolant temperature gage is the same on all pack variants. The gage has a blue segment for low temperatures and a red segment for excessively high temperatures. For normal operating temperatures the gage needle pointer is positioned centrally in the gage display zone. The needle pointer position translates to the following approximate temperatures.
Engine Coolant Temperature deg C (deg F) Needle Pointer Position
Ignition off Park position
40 (104) Cold (Blue segment)
75 - 115 (167 - 239) Normal
120 (248) Start of hot (Red segment)
125 (257) End of hot
Ambient Light Sensor
An ambient light sensor is located in the instrument cluster, adjacent to the alarm indicator. The ambient light sensor is a phototransistor which measures the available ambient light.
The phototransistor measures the ambient light (lux) level and passes a signal value for the available light level to the instrument cluster microprocessor. The instrument cluster software adjusts the display brightness of the message center and information display LCD's accordingly to ensure that the displays are clearly visible during day and night time driving.
Message Center
Refer to Information and Message Center section for details.
Inputs And Outputs
A single electrical harness connector provides all inputs and outputs to and from the instrument cluster.
Instrument cluster Harness Connector C0230
Diagnostics
Car Configuration File
The Car Configuration File (CCF) contains all relevant data about the specification and market condition of the applicable vehicle, immobilisation codes and driver personal settings. This information is retained in the Central Junction Box (CJB), the Engine Control Module (ECM) and the instrument cluster enabling each system module to detect which systems and components are fitted to the vehicle. The information is continuously transferred between the three system modules to ensure that the data is constantly backed-up between the modules.
CAUTION: When a new instrument cluster is to be installed, an approved Land Rover diagnostic system must be connected to the vehicle and the instrument cluster renewal procedure followed to replace the cluster. This will ensure that vehicle coding data is correctly installed in the new instrument cluster. An approved Land Rover diagnostic system will also record the current service interval data and restore the settings in the new instrument cluster.
When a new instrument cluster is installed, an approved Land Rover diagnostic system is used to transfer the CCF data from the CJB to the replacement cluster. Vehicle coding data such as engine type, market etc is retrieved and used to update the replacement instrument cluster.
The CCF will also need to be updated using an approved Land Rover diagnostic system if the vehicle is modified in service from its original factory specification. This can include fitting non-standard wheels and/or tyres, optional accessory dealer fit components with an electrical interface, i.e. park distance control.
Customer Personalisation
Refer to Information and Message Center section for details.