Land Rover Body And Paint Air Bag And Safety Belt Rover Manual
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The SRS warning indicator is controlled by the restraints control module which transmits CAN signals to the instrument cluster. The warning indicator is illuminated for 6 seconds for a bulb check by the restraints control module when the ignition is moved to position II. If a fault is detected in the SRS the restraints control module illuminates the warning indicator in a red color until the fault is rectified. The instrument cluster also performs a check of the indicator LED functionality. Failure of the indicator LED is transmitted to the driver in the form of an error message which is displayed in the trip meter display. 10 and 11. Left and Right Turn Indicators The turn indicators are controlled by the instrument cluster software on receipt of CAN signals on the medium speed CAN bus from the Central Junction Box (CJB). When the turn signal indicator switch is operated, the CJB transmits a signal to the instrument cluster to operate the applicable turn indicator. The instrument cluster software controls the flash rate of the indicator which flashes in a green color. During normal turn signal indicator operation the indicator flashes slowly, accompanied simultaneously by a sound from the instrument cluster sounder. If a fault exists, the instrument cluster responds to a fault message from the CJB and flashes the indicator at double speed. The hazard warning indicators are also controlled by the CJB and the instrument cluster software and operate in the same manner as the turn signal indicators. The hazard warning indicators can operate with the ignition switched off, therefore, the CAN signal from the CJB to the instrument cluster to operate the left and right hand turn signal indicators will also wake-up the instrument cluster. 12. High Beam Indicator The high beam 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 the high beam switch is moved to the high beam or headlight flash position, the CJB transmits a CAN message to the instrument cluster to illuminate the high beam indicator in a blue color. 13. Tyre Pressure Monitoring System (TPMS) Indicator The Tyre Pressure Monitoring System (TPMS) indicator is controlled by the instrument cluster software on receipt of CAN signals from the TPMS module. The indicator is illuminated in an amber color for a 3 second bulb check by the TPMS module when the ignition is moved to position II. If the indicator remains illuminated after the engine is started or illuminates when driving, the TPMS has developed a fault. The tyre pressures should be monitored manually until the fault is rectified. 14. Safety Belt Warning Indicator The safety belt warning indicator is controlled by the restraints control module and the instrument cluster software on receipt of CAN signals from the restraints control module. The indicator is illuminated in a red color when the ignition is moved to position II. The illumination will remain on until the safety belt buckle is latched in position. If the safety belt of an occupied front seat is not fastened, when the vehicle speed exceeds 8 km/h (5 mph) the indicator will flash and repetitive chime will emit for 10 seconds from the instrument cluster. This will be repeated every 30 seconds until the safety belt is fastened, the vehicle speed is reduced below 5 km/h (3 mph) or the ignition switch is moved to the off position. On vehicles with a high line instrument cluster, the indicator warning illumination will be accompanied by a message in the message center. On NAS vehicles, the indicator will remain permanently illuminated until the safety belt is fastened, the vehicle speed is reduced below 5 km/h (3 mph) or the ignition switch is moved to the off position. 15 and 38. Brake Warning Indicator (G421242) Technical Training72 Lesson 2 – ElectricalInstrument Cluster
This indicator is controlled by CAN signals from the ABS module for Electronic Brake Assist (EBA) and Electronic Brake Distribution (EBD) faults. Brake pad wear or low brake fluid indications are controlled by the instrument cluster with the pad wear sensors and the fluid level sensor hard wired into the instrument cluster. The indicator can be illuminated in an amber or red colour depending on the fault. The indicator is illuminated for a bulb check when the ignition is switched on. The indicator is illuminated in an amber colour for 1.5 seconds and red colour for a further 1.5 seconds. If no faults exist, the indicator is extinguished after the bulb check period. The brake warning indicator functions are assigned priority. Fault conditions which require a red illumination have priority over amber illuminated faults. Brake Pad Wear •The front left hand inboard brake pad and the rear right hand inboard brake pad are fitted with wear sensors. The pads are wired in series to the instrument cluster which continuously monitors the circuit. When one or both pads wear to their allowed limit (approximately 75% worn) the sensor circuit is broken and is detected by the instrument cluster software. The instrument cluster illuminates the brake warning indicator in a red colour and on high line instrument cluster a message PAD WEAR is displayed in the message center. When the pad(s) are replaced, the instrument cluster senses the completed circuit and withdraws the indicator illumination and message display (if applicable) when the ignition is switched on to position II. EBA/EBD Warning •If a failure of the EBA or EBD functions occur, the ABS module transmits a CAN signal which is received by the instrument cluster. The instrument cluster software illuminates the brake warning indicator in an amber color for minor EBA/EBD faults and in a red color for major EBA/EBD faults. The indicator will remain illuminated for as long as the fault exists. 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 Instrument ClusterLesson 2 – Electrical 73Technical Training (G421242)
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 illuminate continuously until the fault is rectified. 19 and 36. 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 37. 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 transmits CAN signals 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 transmits CAN signals 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 controlled by the Automatic Temperature Control (ATC) module and the instrument cluster software. The Fuel Burning Heater (FBH) is controlled by the ATC module and is switched on at a preset time by a driver set time in the instrument cluster software. The indicator is illuminated in an amber color for a 3 seconds bulb check when the ignition is moved to position II. The indicator will remain illuminated at all times when the FBH is active. 25. Engine Management System (EMS) Fault Indicator (G421242) Technical Training74 Lesson 2 – ElectricalInstrument Cluster
The EMS fault indicator is only available on low line instrument clusters. The indicator is controlled by the ECM and the instrument cluster software on receipt of CAN signals from the ECM. The indicator is illuminated in an amber color for bulb check when the ignition is moved to position II. The lamp is extinguished when the engine starts. Engine management faults which do not affect emissions will permanently illuminate the EMS fault indicator. The indicator will only extinguish when the fault has been rectified. Reduced engine performance or limp home operation is also signalled to the driver by the EMS fault indicator. 26. Driveline Fault Indicator The Driveline fault indicator is controlled by transfer box control module, rear differential control module and the transmission control module and the instrument cluster software. The indicator is illuminated by the instrument cluster on receipt of a CAN signal of either of the controlling modules. The instrument cluster interprets the signals and can illuminate the indicator in either an amber or red colour as appropriate for faults relating to either the transfer box, rear differential or the automatic transmission. Amber illumination signifies a minor fault which should be rectified when convenient, Red illumination signifies a major fault which should be rectified at the earliest opportunity. 27. Hill Descent Control (HDC) Fault Indicator The HDC fault indicator is only available on low line instrument clusters; on high line instrument cluster fault information is displayed by appropriate messages in the message center. The HDC fault indicator is illuminated by the instrument cluster software on receipt of CAN signals from the ABS module. The indicator is illuminated in an amber color when a HDC fault is present. The indicator is illuminated in an amber color for a 3 second bulb check when the ignition is moved to position II. If a fault occurs in the HDC system, the amber indicator is illuminated 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. If the use of HDC causes the brake discs to exceed their pre-determined temperature, the HDC system initiates a fade out. The HDC fault indicator flashes during fade out. When the brake discs have cooled sufficiently, HDC is reactivated and the HDC fault indicator is extinguished. 28. Water In Fuel Indicator This indicator is non-functional. 29. Driveline Overheat Indicator The driveline overheat indicator is controlled by the instrument cluster software on receipt of CAN signals from the transfer box control module, rear differential control module or the transmission control module for the automatic transmission. The indicator is illuminated in an amber color for a 3 second bulb check when the ignition is moved to position II. When one or more of the control modules sense that the controlled component has reached its over temperature threshold, the applicable control module(s) transmits a CAN signal to the instrument cluster which illuminates the indicator for as long as the over temperature condition exists. 30. Low Washer Fluid Indicator The low washer fluid indicator is only available on low line instrument clusters; on high line instrument cluster the level information is displayed by appropriate Instrument ClusterLesson 2 – Electrical 75Technical Training (G421242)
messages in the message center. The low washer fluid indicator is controlled by the instrument cluster. The washer fluid level sensor is hardwired into the instrument cluster which monitors the sensor output. The indicator is illuminated in an amber color for 3 seconds when the ignition is moved to position II. When the fluid in the washer reservoir falls to a predetermined level, the instrument cluster senses the signals from the sensor and illuminates the indicator and emits a single warning chime to alert the driver. The instrument cluster monitors the level sensor signals every 15 seconds to prevent incorrect warnings occurring due to fluid movement. When the reservoir is replenished the indicator is extinguished. 31. Door Open Indicator The door open indicator is controlled by the instrument cluster on receipt of CAN signals from the Central Junction Box (CJB). The indicator is illuminated in a red color if any of the front or rear passenger doors, the drivers door, the bonnet or the tail gate are left open with the ignition switch in position II. 32. Park Brake City Mode Indicator This indicator is non-functional. 33. Tyre Pressure Warning Indicator The tyre pressure warning indicator is only available on low instrument cluster, high line instrument clusters display warning messages in the message center. The Tyre Pressure Monitoring System (TPMS) indicator is controlled by the instrument cluster software on receipt of CAN signals from the TPMS module. The indicator is illuminated in a red color for a 3 second bulb check by the TPMS module when the ignition is moved to position II. If the indicator remains illuminated after the engine is started or illuminates when driving, the vehicle should be stopped at the earliest opportunity and the tyre pressures checked. 34. Low Coolant Indicator The low coolant indicator is controlled by the instrument cluster. The coolant level sensor is hardwired into the instrument cluster which monitors the sensor output. The indicator is illuminated in an amber color for 3 seconds when the ignition is moved to position II. When the coolant in the header tank falls to a predetermined level, the instrument cluster senses the signals from the low coolant sensor. The instrument cluster flashes the indicator for 5 seconds accompanied by an a chime and then illuminates the indicator. The indicator remains illuminated until the coolant level in the header tank is restored to its correct level. The instrument cluster monitors the level sensor signals every 15 seconds to prevent incorrect warnings due to fluid movement. 35. Overspeed Warning Indicator The overspeed warning indicator is only available on low line instrument clusters; on high line instrument cluster the level information is displayed by appropriate messages in the message center. The overspeed warning indicator is controlled by the instrument cluster and the speed threshold is determined by the default setting. The instrument cluster receives vehicle speed information from the ABS module on the CAN. The instrument cluster software monitors the speed signal data and determines when the speed threshold has been exceeded. When an overspeed condition occurs, the indicator is illuminated permanently for as long as the overspeed condition occurs. 39. Adaptive Cruise Control (ACC) Indicator (if fitted) The ACC indicator is controlled by the ACC 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 ACC system is active and will automatically control the vehicle speed to maintain a set distance from the vehicle in front. (G421242) Technical Training76 Lesson 2 – ElectricalInstrument Cluster
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 kilometres per hour, the speed in miles per hour as the main display and kilometres per hour as a secondary display and Canadian variants show the kilometres 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 10 liters (2.19 Gallons) on petrol models and 18 liters Instrument ClusterLesson 2 – Electrical 77Technical Training (G421242)
(3.96 Gallons) on diesel models. This is accompanied by a chime from the instrument cluster to alert the driver to the low fuel condition. On vehicles with a high line instrument cluster the low fuel level is also displayed in the message center. The fuel tank contents is converted into a CAN signal by the instrument cluster and transmitted on the CAN. This is used by the fuel fired booster heater to suspend operation on diesel variants. The following table shows the fuel tank fuel quantity and the respective pointer positions. Needle Pointer PositionFuel Tank Quantity (Liters) Below empty0 Empty5 Low fuel (no gage indica- tion) 10 Quarter full30 Half full35 Half full45 Three quarter full60 Full75 Above full80 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. Needle Pointer PositionEngine Coolant Temper- ature ºC (ºF) Park positionIgnition off Cold (Blue segment)40 (104) Normal75 - 115 (167 - 239) Start of hot (Red segment)120 (248) End of hot125 (257) 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 LCDs 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. (G421242) Technical Training78 Lesson 2 – ElectricalInstrument Cluster
INPUTS AND OUTPUTSA single electrical harness connector provides all inputs and outputs to and from the instrument cluster. Instrument cluster Harness Connector C0230 Input/OutputDescriptionPin No. Input/OutputHigh Speed CAN + Positive1 Input/OutputHigh Speed CAN - Negative2 InputLow oil pressure sensor3 InputLow washer fluid level sensor4 InputDimmer switch input - PWM illumination control5 -Not used6 InputAlarm LED indicator7 InputPark brake - direct drive to indicator8 InputBrake pad wear sensors9 -Not used10 -Not used11 InputFuel tank level sensor 112 InputFuel tank level sensor ground13 InputGround14 InputPower supply - Ignition switch position II15 Instrument ClusterLesson 2 – Electrical 79Technical Training (G421242)
Input/OutputDescriptionPin No. InputPower supply - 12V Permanent16 Input/OutputMedium Speed CAN + Positive17 Input/OutputMedium Speed CAN - Negative18 InputLow engine coolant level sensor19 InputRear fog lamp active20 InputBrake fluid level sensor21 InputTrip computer button22 InputNot used23 InputFront fog lamp active24 -Not used25 -Not used26 InputFuel tank level sensor 227 -Not used28 -Not used29 -Not used30 InputPower supply - Ground31 InputPower supply - Ground32 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, T4 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. T4 will also record the current service interval data and restore the settings in the new instrument cluster. (G421242) Technical Training80 Lesson 2 – ElectricalInstrument Cluster
When a new instrument cluster is installed, T4 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 T4 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. Instrument ClusterLesson 2 – Electrical 81Technical Training (G421242)