Instruments - Description & Operation Land Rover Range Rover III

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General

The instrument packs fitted to all New Range Rover models are similar and only differ in the following features

1. mph or km/h speedometer
2. tachometer maximum rev/min band.
3. mph or km/h odometer and trip display
4. message center language display
5. ambient temperature display °C or °F.

The instrument pack is a totally electronic device which receives analogue or digital signals via hardwired or bus systems for instrumentation operation.

The signals are processed by two microprocessors which transpose the data into analogue gauge indications or warning lamp illumination. The pack is connected to the vehicle electrical system by three connectors which provide all input and output connections for instrument pack operation.

No internal components of the instrument pack are serviceable, with the only changeable parts being five 1.5W bulbs, at the rear of the pack, which are used for LCD backlighting illumination.

The instrument pack has two main functions; to provide information to the driver of the vehicle status and to process and relay digital signals from and to other system controlling ECU's.

The instrument pack features the following displays

1. Tachometer - large analogue display
2. Speedometer - large analogue display
3. Fuel gauge - small analogue display
4. Engine coolant temperature gauge - small analogue display
5. Engine service data - LED illuminated
6. Gearbox/transfer box status indicator - LED illuminated
7. Odometer - LCD
8. Trip meter - LCD
9. Ambient temperature - LCD
10. Message center - LCD.

The instrument pack also features a number of warning lamps. The warning lamps illuminate in one of four colors which indicate the level of importance of the warning as follows

1. Red = Warning
2. Amber = Caution
3. Green = System operative
4. Blue = Headlamp main beam operative.

Warning Lamps

The warning lamps are located in two groups at the left and right hand side of the pack. The direction indicators and main beam warning lamps are located at the top of the display and the glow plug, DSC and HDC warning lamps are located above the message center, between the two large analogue gauges.

The warning lamps can be split into two groups; self controlled and externally controlled.

Self controlled lamps are dependent on software logic within the instrument pack for activation. The pack software controls the lamp check illumination at ignition on and all lamps whose operation is wholly controlled by the pack, the low fuel level warning lamp for example.

Externally controlled lamps are supplied with a current from another system controlling ECU or triggered by the pack on receipt of a bus message from another ECU.

Some lamps are activated by an external ECU, but the control logic is retained within the pack. For example, the direction indicator warning lamps are synchronized and controlled by the LCM, but the lamp illumination logic is retained within the pack. These lamps are shown in the following table as being self and externally controlled.

The following table shows the available warning lamps and indicates if they are subject to a bulb check illumination and if they are self controlled or externally controlled.

AVAILABLE WARNING LAMPS

Analogue Instruments

The analogue instruments are

1. speedometer
2. tachometer
3. fuel level gauge
4. engine coolant temperature gauge.

Speedometer

The speedometer is an electrically driven, analogue instrument for displaying the vehicle speed. The pointer needle is oil damped to prevent impacts on the vehicle wheels, causing deflection of the pointer needle.

The speedometer is driven by a square wave signal derived from the ABS ECU. The wheel speeds are measured by sensors reading rotational speed from toothed targets on the hubs. These speeds are passed to the ABS ECU in the form of pulsed signals. The ABS ECU is programmed that 48 pulses is equal to one revolution of the wheels and this equates in distance to approximately 2 meters. The actual signal that drives the speedometer is a buffered signal sent from the left hand rear speed sensor.

This information is passed from the ABS ECU, on a hardwired connection, to the instrument pack and is received by one of the microprocessors. The microprocessor applies a formula to the signal and calculates a numerical, 16 bit value for the signal. This signal is then used by the speedometer drive to display the current speed to the driver. A second digital signal output is also broadcast on the CAN, I and K buses for use by other systems.

To prevent incorrect readings due to spinning wheels, the microprocessor introduces a time delay on the output signal if the received speed signal increases too quickly. The delay ensures that only the true speed is displayed and transmitted on the bus systems.

Two versions of the speedometer display are used. One shows the speed in kilometers per hour and the other shows the speed in miles per hour as the main display and kilometers per hour as a secondary display.

Tachometer

The tachometer is an electrically driven, analogue instrument for displaying the vehicle engine speed. The pointer needle is oil damped to prevent impacts on the vehicle wheels, causing deflection of the pointer needle.

The tachometer is driven by an engine speed signal transmitted on the CAN from the ECM. The signal is in the form of a square wave signal of variable frequency derived from the crankshaft position sensor. The signal is received by one of the microprocessors which processes the signal. The output signal from the microprocessor is then used to drive 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 7000 rev/min. The diesel engine variants use a display which has a maximum engine speed reading of 6000 rev/min.

Fuel Level Gauge

The fuel gauge is an electrically driven, analogue instrument for displaying the fuel tank contents. The pointer needle is oil damped to prevent impacts on the vehicle wheels, causing deflection of the pointer needle. 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 in each side of the saddle type fuel tank and uses a float operated potentiometer for measuring the tank contents. Each tank level sensor is supplied with a current from the instrument pack. The returned current, via the potentiometer of the sensor, is read by one of the microprocessors. The reduced current from both sensors is evaluated and converted into a signal to position the fuel gauge needle at the appropriate level reading. When the microprocessor determines that fuel tank contents have reached a predetermined level, the low fuel level warning lamp is illuminated and a chime is emitted from the sounder to alert the driver of the low fuel condition.

The following table shows potentiometer resistance values in relation to fuel tank contents and the fuel gauge display. The figures are shown as a guide only because an infinite number of left/right sensor resistance values can be obtained.

POTENTIOMETER RESISTANCE VALUES REFERENCE

Two versions of the fuel level gauge are used. Markets with a kilometers only speedometer use a percentage gauge reading marked 0 - 100%, with graduations of 0, 25, 50, 75 and max. Markets using miles and kilometers speedometer readouts use an imperial fraction reading marked 0-1, with graduations of 0, 1/4, 1/2, 3/4 and 1.

Engine Coolant Temperature Gauge

The engine coolant temperature gauge is an electrically driven, analogue instrument for displaying the engine coolant temperature to the driver. The pointer needle is oil damped to prevent impacts on the vehicle wheels causing deflection of the pointer needle. When the ignition is off, the pointer returns to the cold position.

The instrument pack is connected via two wires to the Engine Coolant Temperature (ECT) sensor. This sensor has a four pin connector, with the remaining two pins connected to the ECM. The ECT sensor is an NTC sensor located in the engine coolant flow. The instrument pack outputs a signal voltage to the sensor and measures the returned signal. The sensor resistance falls as the coolant temperature increases. The instrument pack microprocessor evaluates the returned signal and converts the information into an output drive to position the temperature gauge needle at the appropriate position. The engine coolant temperature is available for use by other vehicle systems via the CAN.

DESCRIPTION

The following table shows coolant temperature relationship to gauge needle pointer position.

COOLANT TEMPERATURE RELATIONSHIP TO GAUGE NEEDLE POINTER POSITION

The engine coolant temperature gauge is the same on all pack variants. The gauge display has a blue segment for low temperatures and a red segment for excessively high temperatures. For normal engine operating temperatures the gauge needle pointer is positioned centrally in the gauge display zone.

Scheme 5

The instrument pack has four separate LCD's which show the following data

1. Odometer - Displays the total vehicle distance travelled
2. Trip meter - Displays the total vehicle distance travelled since last reset
3. Ambient temperature - Displays the external ambient temperature in °C or °F
4. Message center - Displays system information to the driver.

The LCD is an integral part of the instrument pack. The LCD comprises black segments on a grey background or green illuminated when the light switch is on. The LCD is illuminated by backlighting which is provided by five 12V/1.5W single filament bulbs.

The backlighting has manual and automatic brightness control. The manual brightness control is only available when the lighting switch is on and is operated using the illumination dimmer rheostat on the fascia, adjacent to the lighting switch. The automatic brightness adjustment is controlled by one of the instrument pack microprocessors and a phototransistor. The phototransistor is located in the instrument pack, adjacent to the MIL/Service Engine Soon warning lamp. The phototransistor measures the available ambient light and adjusts the display brightness accordingly.

Odometer

The odometer displays the total distance which the vehicle has travelled. This is calculated by one of the microprocessors using the wheel speed signals received from the ABS ECU. The total mileage information is made available to other systems on the I and K Buses and is only transmitted in kilometers, irrespective of market configuration.

The odometer display can show distances travelled up 999,999 miles or kilometers. When the ignition is off, pressing the left hand instrument pack button, will allow the odometer reading to be displayed for 25 seconds.

The total distance is also recorded in the instrument pack EEPROM and RAM. This is recorded after every 2 kilometers travelled and transmitted to the LCM. This data is stored and compared to that of the instrument pack to protect against illegal alteration of the odometer readings.

Trip meter

The trip meter displays the total distance which the vehicle has travelled since the last trip meter reset, up to 999.9 miles or kilometers. This is calculated by one of the microprocessors using the wheel speed signals from the ABS ECU and is stored in the instrument pack RAM. The trip meter will restart at zero if the total distance exceeds 999.9 miles or kilometers.

The trip meter LCD also contains a small dot, known as the manipulation point. The manipulation point shows if there is a total distance travelled or other data discrepancy between the instrument pack and LCM. Refer to ' REDUNDANT DATA ' for further details.

Ambient Temperature

The external ambient air temperature is measured by a sensor located behind the Land Rover badge on the front grill and is connected directly to the instrument pack.

The ambient temperature sensor is an NTC sensor whose resistance falls as the ambient temperature increases. The instrument pack outputs a reference current of 5.1V to the sensor. The instrument pack microprocessor evaluates the returned signal and converts the information into a temperature value and displays the appropriate temperature in the LCD. The temperature display can be adjusted by T4 to be displayed in either Celsius or Fahrenheit, dependent on market requirements.

The instrument pack continuously transmits the ambient temperature signals on the CAN for use by other systems, when the ignition is on. When the ignition is off, the instrument pack transmits an ambient temperature message on the I/K bus, once every 10 minutes, for a duration of 400ms.

The sensor is capable of reading temperatures in the range of -45°C (-49°F) to +56°C (+132.8°F). The instrument pack LCD will display minimum temperatures to -40°C (-40°F) and maximum temperatures to +50°C (+122°F).

The LCM monitors the temperature signals output on the bus systems. If the temperature falls to 3°C (37.4°F) or below, the LCM outputs a message signal to instrument pack, when the ignition is on. The message signal is received by the instrument pack which displays a message, 'EXTERNAL TEMPERATURE', with the recorded temperature alongside. The instrument pack also emits a single chime from the sounder to alert the driver to the warning message. The display time of the message is between 6 and 15 seconds, dependent on other displayed messages.

Ambient Temperature Sensor Resistance Temperature Values

AMBIENT TEMPERATURE SENSOR RESISTANCE TEMPERATURE VALUES

Message Centre

The message center is located at the bottom of the instrument pack. The message center comprises an LCD, which has a 20 character text display. The majority of messages are generated by the LCM which monitors system status via the bus systems and displays system information messages as appropriate. Other system ECU's are also capable of generating messages to display system status. Most messages are accompanied by a chime, which is requested by the ECU generating the message and generated by the instrument pack via the sounder.

A check control button is located between the tachometer and the engine coolant temperature gauge. This button allows the driver to view system status messages which are current in the instrument pack RAM. Pressing and releasing the check control button, displays current messages in priority order or, if no messages are present, the message center displays 'CHECK CONTROL OK'.

The messages are assigned priorities, depending on the effect on driving safety and driving ability of the vehicle. New messages are displayed and accompanied by a chime from the sounder. Messages are divided into priority groups P1, P2 and P3. The priority groups are as follows

1. Priority Group P1 This group includes messages which have a direct affect on the driving ability and safety of the vehicle, " «ENGINE OIL PRESSURE»(/land-rover/range-rover/iii-2002-2005/remont/gauges-instrument-panels/#instruments-description-operation__engine-oil-pressure) " for example. This message requires an urgent and immediate reaction from the driver in response to the message. P1 messages are also accompanied by appropriate flashing warning lamp symbols adjacent to the message center. If more than one P1 message is present, each message is displayed in turn at 3 second intervals. P1 messages are displayed between the symbols "> <" which are flashing.
2. Priority Group P2 This group includes messages which do not directly affect driving ability or safety of the vehicle, "CHECK NUMPLATE LIGHT" for example. This message must be noted by the driver and the cause rectified as soon as possible. Each message is indicated once for a maximum of 23 seconds. They can be recalled by pressing the check control, RH, button on the instrument pack. P2 messages are displayed between the symbols "> <", which are permanently illuminated with the message.
3. Priority Group P3 This group displays messages which relate to fluid levels, "LOW SCREEN WASH" for example. Depending on the message, some messages are only displayed at the end of a journey, to avoid irritation to the driver. P3 messages are displayed between the symbols "> <", which are permanently illuminated with the message.

Two other groups are defined as 'End of Journey Messages' and 'Special Messages S and S1', as follows

1. End of Journey Messages Messages categorized as 'P1' and 'P2' error messages, are displayed again at the end of the journey. Error messages do not include messages such as "DOOR OPEN". Messages in the 'P3' group are displayed after the 'P1' and 'P2' messages. New messages, which only occur at the end of a journey, "LIGHTS ON" for example, are displayed according to their priority.
2. Special Messages S and S1 These messages have the highest priority and cannot be overridden by messages in groups 'P1', 'P2' and 'P3'. They immediately overwrite any currently displayed messages. If more than one special message is present, the message with the highest priority has priority, after the current displayed message has been shown for at least 1 second. S and S1 messages are not displayed between any symbols.

Most messages, especially S, S1 and P messages are accompanied by a chime from the sounder to alert the driver to their presence. At the end of a journey, a single chime precedes all end of journey messages.

For 3 minutes after the ignition is switched off, messages can be displayed using the check control RH button on the instrument pack. If more than one message is present, the button must be pressed again to display the next message. If no messages are present, 'CHECK CONTROL OK' will be displayed for as long as the button is pressed.

The messages are displayed in a language applicable to the vehicle market configuration and can be changed using T4. The following list shows the possible messages which can be displayed.

MESSAGE CENTRE MESSAGES

Scheme 6

The Service Interval Indicator (SII) is located adjacent to the LCD and uses the odometer LCD to show distance to next service and, in all markets except Japan and NAS, date to next service. In all markets except Japan and NAS, the indicator displays 'OIL SERVICE' or 'INSPECTION' to inform the driver of the type of service due next. In Japan and NAS markets, the SII always displays 'INSPECTION'.

The SII is controlled by one of the microprocessors and software in the instrument pack and the data stored in the EEPROM. The distance to next service is calculated on fuel consumption, which represents the loads placed on the engine more accurately than distance travelled. Therefore, a vehicle which is driven aggressively will require a service earlier than a vehicle which is driven economically.

The service interval data is displayed in the odometer for 5 seconds, every time the ignition is switched on.

Scheme 7

When the ignition is switched on, the remaining distance to service is displayed for 5 seconds in the odometer LCD. Simultaneously, the next service type will also be displayed in the SII. A minus sign preceding the remaining distance indicates that the service interval has been exceeded and the distance by which it is overdue. In all markets except Japan and NAS, if the due date of the next service has been reached, the time inspection symbol will also be displayed in the SII.

Scheme 8

In all markets except Japan and NAS, when the remaining distance is displayed, pressing the LH button of the instrument pack, within the 5 second display period, illuminates the time inspection clock symbol for an additional 5 seconds. The distance to service information displayed in the odometer LCD changes to the due date of the service by showing the month and year. A decimal point is positioned between the month and the year. In the above example, the year is 2003 and the month is December. If the LH instrument pack button is pressed again, within the 5 second period, the odometer LCD changes back to the distance remaining to the service.

SII Reset Procedure

The SII can be reset with the following procedure using the instrument pack buttons.

Note. The distances and dates shown are examples only and not necessarily representative of actual messages displayed.

Note. After a reset, the SII cannot be reset again until the instrument pack registers the vehicle has used 20% of the fuel required to travel the nominal distance to the next service. The fuel required to travel the nominal distance is stored in the instrument pack EEPROM, and varies with engine type

1. V8 - 4075 liters (1075 US gallons) for a nominal distance of 25000 km (15625 miles).
2. Td6 -1232, 1680 or 2464 liters (325, 444 or 651 US gallons) for a nominal distance of 11000, 15000 or 22000 km (6875, 9375 or 13750 miles) respectively.

SII Reset Procedure (All Except Japan and NAS)

1. Ensure that the ignition is switched off.
2. Press and hold the LH instrument pack button.
3. With the button held, switch the ignition on to position I (AUX).
4. Continue to hold the LH instrument pack button for a further 5 seconds, until the "SIA RESET" appears.
5. The message center will display the distance to service status as "RESET SIA: 3600km/mls" and the type of service (OIL SERVICE or INSPECTION).
6. Check that the reset distance limit has been reached. If yes, proceed to step 9 . If no, proceed to step 7.
7. Press the LH button once. The message center will display the date to service status as "RESET SIA: 03.12".
8. Check that the reset date limit has been reached. If yes, proceed to step 11 . If no, proceed to step 10 .
9. When the distance reset limit has been reached or exceeded, press and hold the LH button for 5 seconds. "RESET" flashes in the message center five times. If the LH button is not pressed again before the fifth flash of "RESET", the reset will not be performed. The message center will display "END SIA: 3600 km/miles" for 5 seconds and the display will change to the service date "RESET SIA: 12.03". If the LH button is pressed before the fifth flash of "RESET", the service distance will be reset. The message center will display the new service distance "END SIA: 25000 km/miles" for 5 seconds. The service date will then be displayed.
10. Press the LH button once. The message center will display "END SIA" for 2 seconds. This ends the service interval check and reset.
11. When the date reset limit has been reached or exceeded, press and hold the LH button for 5 seconds. "RESET" flashes in the message center five times. If the LH button is not pressed again before the fifth flash of "RESET", the reset will not be performed. The message center will display "END SIA: 12.03" for 5 seconds. "END SIA" will be displayed for a further 2 seconds and the service interval and check will be ended. If the LH button is pressed before the fifth flash of "RESET", the service date will be reset. The message center will display the new service date "END SIA: 12.04" for 5 seconds. "END SIA" will be displayed for a further 2 seconds and the service interval and check will be ended.
12. Switch the ignition off.

SII Reset Procedure (Japan and NAS)

1. Ensure that the ignition is switched off.
2. Press and hold the LH instrument pack button.
3. With the button held, switch the ignition on to position I (AUX).
4. Continue to hold the LH instrument pack button for a further 5 seconds, until the "SIA RESET" appears.
5. The message center will display the distance to service status as "RESET SIA: 3600km/mls" and "INSPECTION".
6. Press and hold the LH button for another 5 seconds. "RESET" flashes in the message center. If the LH button is not pressed again before the fifth flash of "RESET", the reset will not be performed. The message center will display the existing distance to service data for 5 seconds, followed by "END SIA" for 2 seconds, and then switch off. If the LH button is pressed before the fifth flash of "RESET", the service distance will be reset. The message center will display the new service distance "END SIA: 25000 km/miles" for 5 seconds, followed by "END SIA" for 2 seconds, and then switch off.
7. Switch the ignition off.

Gear Position Display

The gear position display and the low range lamp are controlled by the EAT ECU and the transfer box ECU respectively. The gear position is illuminated in response to CAN messages from the EAT ECU and the low range lamp is illuminated on receipt of a CAN message from the transfer box ECU.

The instrument pack has no control over the gear position display, but monitors the controlling CAN messages. If the instrument pack detects ten incorrect CAN messages, "TRANS. FAILSAFE PROG" is illuminated in the message center. If a correct CAN message is received when the ignition is next switched on to position II, the error is erased and the message removed. If 'Sport' or 'Manual' modes are selected, the instrument pack detects the CAN message for these selections and displays the applicable message in the message center.

On-Board Computer

The instrument pack contains software to enable the operation of an on-board computer. The on-board computer functions can be displayed in the instrument pack message center, on a Multi-Information Display (MID) or a Multi-Function Display (MFD), depending on vehicle specification.

The following on-board computer functions are available

1. Time of day
2. Date
3. Reminder signal (MEMO)
4. Ambient temperature (only displayed in the instrument pack LCD and the MFD)
5. Average speed
6. Anticipated fuel tank range
7. Input of distance between journey start and end points (only on MID and MFD) (DISTANCE)
8. Anticipated arrival time (ARRIVAL)
9. Average fuel consumption (CONSUMPTION 1 & 2)
10. Speed warning (LIMIT)
11. Stop watch (TIMER) or switching points for park heating/park ventilation (TIME 1 & 2)
12. Anti-theft protection (CODE).

The on-board computer functions can be displayed in the instrument pack alone or in the MID/MFD and the instrument pack simultaneously.

Scheme 9

Scheme 10

The on-board computer functions are selected in the MID by pressing the ' i ' button for on-board computer functions or the clock symbol for clock timer functions. On the MFD, the on-board computer functions are selected from a menu on the LCD or by pressing the clock symbol for clock timer functions. The computer functions can be selected in the message center by pressing the ' i ' button on the LH column stalk switch.

The instrument pack message center shows all the possible computer function messages in a scrolling display. The function displays can be scrolled through using the on-board computer button ( i ) on the LH column stalk switch. The column stalk button allows the resetting of certain functions in conjunction with the MID/MFD, and also the order in which the function displays are scrolled through. Four functions cannot be accessed using the column stalk button, they are; CODE, MEMO, EXTERNAL AIR TEMPERATURE and HEAT ON/OFF AIR ON/OFF. These functions are only available using the MID/MFD.

When the on-board computer is being accessed via the MID/MFD, these units communicate with the instrument pack message center to display the function information in the display in the MID/MFD only. The MID/MFD also allow for the resetting and programming of certain on-board computer functions, such as the clock, date, speed limit and stop watch.

The on-board computer system of the instrument pack supplies the MID/MFD with data and commands on the I Bus. Some computer functions require an exchange of data between the Automatic Temperature Control (ATC) ECU and the Body Control Unit (BCU) which is carried out on the K Bus.

Operation of the buttons on the MID or selections on the LCD screen of the MFD are passed to the instrument pack software for calculation of the text and numerical values to be displayed. The MID/MFD are purely a user interface with regard to the on-board computer, with the instrument pack being the controlling component.

The MFD has one exception to this. Using data supplied by the instrument pack, the MFD self generates the text messages which appear on the LCD screen.

Security Code

The security code function prevents unauthorized persons from starting the engine. This function is controlled from the MID/MFD. The driver can select and enter a code, without which subsequent starting of the engine is prevented. This function can be used if the vehicle is to left unattended for a long period of time, i.e. airport car park. Each time the code is activated, it is only valid until the next time the engine is started. If the code is not available or forgotten, emergency deactivation is possible.

The CODE is a four digit number which can be entered with the ignition at position I (AUX). If the vehicle is parked with the code armed, starting of the engine is inhibited until the correct code is entered to disarm the alarm. If the incorrect code is entered, the alarm horn is activated and the immobilization ECU prevents starting. This is performed by messages sent on the K bus to the BCU. The BCU electrically controls the alarm horn and the immobilization ECU functions.

The code can be selected on the MID and activated as follows

Code Activation

1. Make sure the ignition is in position I. Press the i key on the MID panel.
2. Press the left side of the CODE SET key.
3. CODE--is displayed in the main display. Enter the code using the number keys. If the code is incorrectly input, press the left side of the CLR SET button and re-enter the code.
4. Press the right side of the CODE SET button to memorize the input and turn the ignition off.

Code De-activation

1. When the ignition is moved to position II, the MID display prompts for the code.
2. Using the numbered key buttons, enter the correct code. Once entered, press the right side of the CODE SET button. If correctly entered the time display will appear and the engine will start.
3. If the code is incorrectly entered three times or three attempts to start the engine are performed, the BBUS will sound for 30 seconds.

The code can be selected on the MFD and activated as follows

1. Select CODE from the main menu.
2. Enter the code using the rotary control. Turn the rotary control until the required number appears and press to confirm. Enter the remaining numbers in the same way. If the code is incorrectly input, select CHANGE and repeat the input procedure.
3. Once the code is entered, it is activated by turning the ignition off.

1. When the ignition is moved to position II, the MFD display prompts for the code.
2. Enter the code using the rotary control. Once the code is entered, select DEACTIVATE. If the code is incorrectly input, select CHANGE and repeat the code input.

Emergency De-activation

1. Disconnect the vehicle battery. This will cause the alarm to sound. Wait for a period of more than 5 minutes and re-connect the battery.
2. Turn the ignition to position I. The display will show a count down for 10 minutes. Once the 10 minutes has expired, the engine can be started. If during the 10 minute period, the code becomes available, it can be input after pressing the CODE button.

On-Board Computer Functions with Column Stalk Switch

Pressing the on-board computer button ( I ) on the LH column stalk, displays the first computer function in the sequence. With each subsequent press of the button, the next function is displayed. The sequence of displayed functions can be programmed by the driver and can be scrolled through continuously to reach the desired function display.

When all the functions have been scrolled through once, the message center appears blank, signifying the end of the function display. When the on-board computer function display is subsequently requested, the message center will display the first function in the sequence. If the function display is interrupted by a system message from the LCM, when the column stalk button is pressed or the check control button is pressed, the last displayed function will reappear in the message center.

The on-board computer function will only be displayed if the LCM releases the message center for function display. This will only occur if the LCM is not displaying any high priority messages at the time. The LCM registers the request for on-board computer function display and, if there are no messages or the displayed message is of a low priority, the on-board computer function is permitted use of the LCD message center.

The following list shows the possible on-board computer functions and their standard sequence of display. This order will be reinstated after a system reset.

1. CLOCK
2. CONSUMPTION 1
3. CONSUMPTION 2
4. RANGE
5. LIMIT
6. DISTANCE
7. ARRIVAL
8. SPEED
9. DATE
10. TIME 1 (only with park heating and/or park ventilation)
11. TIME 2 (only with park heating and/or park ventilation)
12. TIMER.

The following functions cannot be called up using the steering column button. These functions can only be selected with the MID or MFD.

1. HEAT ON/OFF (heating on/off)
2. AIR ON/OFF (ventilation output on/off)
3. OUTSIDE TEMPERATURE
4. CODE.

The sequence of function display is stored in the instrument pack RAM. This sequence can be changed and programmed by the driver using the MID/MFD, with the new sequence also stored in the RAM. The new sequence can be programmed as follows

Scheme 11

1. Ensure that the ignition switch is in position I (AUX) or position II.
2. Press and hold the column stalk i button for 3 seconds. 'REMOTE CONTROL' screen is displayed in the MFD with all computer functions shown. Simultaneously, 'PROG' is displayed in the message center.
3. To set the sequence, first deselect all functions using the RH control on the MFD panel. Select the function and press the RH control to deselect that function. When deselected, the selection text will change color.
4. Using the RH control, navigate to the first required computer function and press the RH control to select. When selected, the selection text will change color.
5. Continue selecting functions in the required order as required. If no functions are selected, there will be no response from the i button when pressed. All or just one function can be selected for display.
6. When desired selections are made, navigate to the 'memorize' function and press the RH control. The selected functions are stored in their selected order in the instrument pack RAM. The instrument message center then displays the first selected function.

Scheme 12

1. Ensure that the ignition switch is in position I (AUX) or position II.
2. Press and hold the i button for 3 seconds. 'PROG 1' appears in the MID with all computer functions assigned to the keys.
3. To set the sequence, select the required functions in order required. If no functions are selected and the 'SET' button is pressed, all computer functions are selected and displayed in their standard sequence.
4. When the selections have been made, press the 'SET' button. The selected functions are stored in their selected order in the instrument pack RAM. The instrument pack message center displays the first selected function.

Bus Systems

The instrument pack has two controlling microprocessors which process software information and control input and output data for the instrument pack and other systems. The processors communicate with other systems on the vehicle via four interfaces: I Bus, K Bus, CAN and diagnostic DS2 Bus. An 8 Kbyte, non-volatile memory (EEPROM) is provided for the storage of vehicle and instrument data (eg; mileage reading, service interval status).

The instrument pack also features a self diagnostic feature and on-board diagnostics via communication with T4. Inputs are received as either analogue signals via conventional hardwired connections or as digital signals via multi-channel connections with the bus systems. These signals are filtered and evaluated by the processors and the data converted into actuation of the analogue gauges and indicator/warning lamps. The processors also function as a gateway for the bus systems, processing data from one system and passing it to another.

The instrument pack receives and transmits data on five bus systems as follows

BUS SYSTEM

Redundant Data Storage

In the event of a new instrument pack having to be installed, certain information needs to be maintained to prevent data loss. This information is transferred continuously from the instrument pack on the I bus and is received and held in an EEPROM in the LCM. The data is also stored, along with other vehicle specification data, in the immobilization ECU.

The data stored is as follows

1. Vehicle Identification Number (VIN)
2. Total distance travelled
3. Service interval fuel volume and type of last service
4. Service interval clock.

When a new instrument pack is installed, the LCM will update the instrument pack EEPROM with the stored data providing the following parameters are met

1. The VIN in the instrument pack and the LCM match
2. The total distance reading in the instrument pack EEPROM is less than 158 miles (255 km)
3. The total distance reading in the LCM EEPROM is less than 999,900 miles or kilometers or equal to or greater than 0 miles or kilometers
4. The total distance recorded in the instrument pack EEPROM is less than the distance travelled stored in the LCM EEPROM.

Vehicle coding data, such as engine type, market, etc., is stored in the immobilization ECU and retrieved by T4 and used to update the new instrument pack.

If the VIN in the instrument pack is set to 0, only service interval data is passed from the LCM EEPROM to the instrument pack RAM, it is not stored in the instrument pack EEPROM. The total distance displayed in the odometer LCD is frozen at the value stored in the instrument pack EEPROM.

If any of the stored data in the LCM EEPROM conflicts with the data within the instrument pack, a lamp, known as a manipulation point, is illuminated in the pack. The manipulation point is located in the trip meter LCD, below the 'Miles' text or next to the 'km' text.

The following conflicts will illuminate the manipulation point

1. The VIN transferred from the LCM on the I Bus to instrument pack is 0
2. The VIN in the instrument pack is 0
3. The VIN in the LCM is different to the VIN in the instrument pack
4. A default value in the EEPROM is used until a CAN index message is sent when the ignition is switched on.

If the EEPROM is in an unlocked (unprotected) condition, the manipulation point will flash, irrespective of whether or not the stored data matches or conflicts.

Scheme 13

Scheme 14

Instrument Pack Harness Connector C0234 Pin Details

INSTRUMENT PACK HARNESS CONNECTOR C0234 PIN DETAILS

Diagnostics

The instrument pack provides an interface (gateway) for data transfer between T4 and the vehicle ECU's. Individual ECU's subject their functional capabilities to self diagnostic checks. Any irregularities or malfunctions are stored in the ECU error memory. The error memories can be interrogated by T4 to establish and diagnose the cause of the error messages.

The instrument pack RAM can be reset with T4 or using the instrument pack test No. 21 (see Instrument Pack Test ). When this procedure is performed, all values stored in the RAM will be erased. Displayed values to the driver, such as trip meter reading and on-board computer sequence and values, will be erased and resume their default values or are reset to values of zero.

The instrument pack also performs a self diagnostic routine to check its function and monitoring of related components. Detected errors are written to the RAM initially and then transferred to the EEPROM when the ignition is switched off. The EEPROM will only store the five most recent errors. If five errors are stored, only further errors of the bus systems or instrument pack EEPROM errors will be memorized in their order of occurrence. Errors already present will be over written. Error messages can be retrieved and diagnosed with T4. When the instrument pack is reset, errors stored in the EEPROM are transferred to the RAM and then erased.

Instrument Pack Test

The instrument pack has a test function to assist with testing, checking and trouble shooting if a repair is required. Test functions are only displayed in the instrument pack LCD.

There are two methods of entering the test mode

1. The ignition switch must be position I (AUX) or II (IGN) and no messages must be displayed in the LCD. Press and hold the check control button on the instrument pack for not less than 5 seconds.
2. Press and hold the check control button and switch the ignition on to position I (AUX).

When test mode is entered, 'TEST-NR.: 01' appears in the message center.

There are 21 test and reset functions available as shown in the following table

21 TEST AND RESET FUNCTIONS

Pressing the check control button moves the display to the next function in the sequence. When a selected function is reached, pressing the trip reset button enters the test function details.

All test functions, with the exception of tests No's. 1 and 2, are locked after the instrument pack is reset and must be unlocked using test No. 19. This locking feature is intended to make instrument pack test functions difficult for unauthorized persons to access. Refer to Test Function No. 19 - Lock/Unlock for further details.

Once in the test function, scrolling through the tests sequentially is performed by pressing the check control button on the instrument pack. When a locked test function is encountered, pressing the trip reset button displays test No. 19 LOCK : ON to allow quick unlocking of the function.

In all markets, the text displayed in the message center for the test functions is in German only.

The instrument pack test can be exited by turning the ignition off or by holding the check control button depressed for more than 2.5 seconds.

Test Function No. 1 - Instrument Pack Identification

1. Test function 1 is not locked and can be accessed immediately. Pressing the trip reset button scrolls through the following individual information relating to instrument pack identification. 'FGNSTNR: AB12345' - Vehicle Identification Number (VIN). 'K: 4571' - Speedometer K Index (displayed in pulses per km or mile). 'BMWTNR: 8373541' - Instrument pack identification number. 'CI: 10 DI: 03 BI: 07' - Coding, diagnostics and bus index reference numbers. 'DAT: 47/01:' - Date of manufacture week/year. 'HW: 03 SW: 500/500' - Hardware/Software numbers. 'ZYL: 6 M:3 S: 425' - Engine data (cylinders, engine factor, fuel supply system slope). 'CAN: 01 AEND:23' - CAN and change index.

Test Function No. 2 - System Test

1. Test function 2 is not locked and can accessed immediately. After selection the instrument pack automatically activates all displays and analogue gauges. This test will only be performed with the ignition in positions I or II and the engine not running. The backlighting of all LCD's are activated. All segments for the odometer, trip meter, ambient temperature and service interval indicator are illuminated. All warning lamps are illuminated. A pixel test of the message center is alternately performed to display a 'chess board' pattern. The pixels are alternately illuminated at intervals of 1.25 seconds. The trip meter display alternates between km and miles and the ambient temperature alternates between °F and °C. The general brake warning lamp alternates between an amber and red output. All analogue gauges are activated and travel from the left stop to the right stop and back to the left stop. When all gauges have returned to their left stop all displays remain illuminated. A second activation of the analogue gauges follows, but this time the needle pointers stop before the right stop position. During this gauge cycle, the instrument pack performs self diagnostics on the gauge operation and records fault data if necessary. This diagnostic check of the gauges is only performed during test function 2 and the data can be retrieved using T4. When the second gauge cycle is complete, normal instrument pack display is resumed.

Test Function No. 3 - Service Interval Indicator Data

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. The following data is displayed and can be scrolled through using the trip reset button. 'SI-L: 1250' - SI liters used since the last service interval reset. SI DAYS: 325' - SI time counter since last service interval reset.

Test Function No. 4 - Momentary Fuel Consumption Values

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. The following data is displayed and can be scrolled through using the trip reset button. 'VBR: 14.3 L/100 KM - momentary consumption in l/100 km for calculation of consumption values. VBR: 20.3 L/H - momentary consumption in liters per hour for consumption assessments when the vehicle is stationary with the engine running.
2. The consumption values are calculated from PWM injector signals which correspond to the injected fuel volume.

Test Function No. 5 - Range Consumption and Range Momentary Value

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. The following data is displayed and can be scrolled through using the trip reset button. The value can be displayed in liters/100km or in MPG, dependent on market programming. 'RW-VBR: 12.7 L/100KM' - average fuel consumption. 'RW: 3238 KM' - range with remaining fuel tank volume.

The internal fuel range consumption value displayed in the on-board computer is calculated using the figures for average tank contents and the distance travelled since the last reset. The fuel range value displayed is calculated using the same figures to show the available range with the remaining fuel in the tank.

Test Function No. 6 - Tank Content Values and Display Value

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. The following data can be scrolled through using the trip reset button. The first display line shows the tank content from the left and right fuel tank level sensors and the overall tank content. The second display line shows the average overall tank content and the value after 'PHASE' relates to the procedure used to calculate the content value. 'TNK: 29.5/34.2/63.7L' - this shows content in left half of tank / content in right half of tank / momentary overall tank content. 'TNKANZ: 60.2L PHASE1' - average tank content and calculation method. The PHASE shows the calculation method as defined below. PHASE1 = Normal calculation procedure using both sensors with no errors. PHASE2 = In the case of a tank level sensor failure, the calculation is performed using the injector PWM signal available on the CAN. PHASE3 = If a sensor failure has occurred and the injector PWM signal is not available, the fuel level gauge will read empty and the low fuel warning lamp will be illuminated.

Test Function No. 7 - Momentary Values for Engine Coolant Temperature, Engine Speed and Ambient Temperature

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. The following data can be scrolled through using the trip reset button. 'KTMP: 105°C' - This shows the engine coolant temperature. If the ignition is in position II the temperature signal is passed on the CAN to the instrument pack. If the ignition is in position I, the temperature signal is read from the analogue input from the engine coolant temperature sensor to the instrument pack. 'N: 248/0 U/min' - This shows the momentary engine speed received on the CAN from the ECM. 'ATMP: +20.0°C' - This shows the ambient temperature received from the ambient air temperature sensor.

If error conditions exist, the following table shows the values which will be displayed.

DISPLAYED VALUES

Test Function No. 8 - Momentary Values for Effective and Displayed Speed in km/h

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. The following data can be scrolled through using the trip reset button. 'V: 98 km/h' - shows the momentary effective speed. 'VAnz: 101 km/h' - shows the displayed speed, compensated for speed signal input error.

Test Function No. 9 - Battery Voltage Supply to Instrument Pack in Volts

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. The following data can be scrolled through using the trip reset button. This function allows the operating voltage applied to the instrument pack to be checked. The value is calculated by measurement of the stabilized 5V internal voltage and monitoring of voltage drop internally within the instrument pack. 'UB: 13.2V' - Shows battery voltage.

Test Function 10 - Read Country Code

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. The following data can be scrolled through using the trip reset button. The language and country code is programmed into the instrument pack EEPROM at the factory, but can be changed using T4. 'LAND: 07 CDN' - shows the country code programmed in the instrument pack.

The following table shows the code and abbreviation for the available markets. Note that the on-board computer language variants for CDN, AUS, GULF and ZA use the same display texts as GB.

CODE AND ABBREVIATION

The country code does not only define the language displayed in the message center, but also defines if the odometer/trip meter display is in miles or kilometers and if the temperature display is in Celsius or Fahrenheit.

Test Function No. 11 - Read Units Display

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. The following data can be scrolled through using the trip reset button. The unit coding of the on-board computer, clock and ambient temperature is programmed at the factory during build and is stored in the EEPROM. This coding can be queried using this function. The unit coding is shown in hexadecimal form for each individual byte. The following shows the coding for bytes 1 and 2. When byte 3 is reached the display changes to byte 1 again. 'EINHEIT 1: 00' - hexadecimal value for byte 1. 'EINHEIT 2: 00' - hexadecimal value for byte 2.

The units for °C or °F or 24 hour or 12 hour clock for example, can be changed using T4 to change the bit assignments for bytes 1, 2 and 3. Refer to T4 for details of units which can be changed.

Test Function No. 12 - Average Speed for Arrival Time Calculation

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. The following data can be scrolled through using the trip reset button. This function shows the average speed used for calculation of the arrival time and also the momentary arrival time value. 'VANK: 136.5 km/h' - this shows the average speed used for arrival time calculation. 'ANK: 23:46' - this shows the momentary arrival time.

The calculation of average speed uses signals from the ABS ECU for speed and distance to produce the average speed value. After the system is reset, a default average value of 40 km/h is used, until the vehicle is moving again with the engine running. When the vehicle is stationary, with the engine running, the calculation of average speed is interrupted. The arrival time is adjusted by monitoring the clock. Every full minute that passes on the clock, with the vehicle stationary, is added to the arrival time.

Test Function No. 13 - Activation of the Chime Signals

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19.This function provides for testing of the instrument pack sounder in the fascia closing panel, below the steering column. When the function is selected, 'CHIME?' appears in the message center. Pressing the trip reset button once activates the three available chime signals as follows: Chime T1 - activated for 100 milliseconds with a 2.5 second pause. Used for the MEMO signal. Chime T2 - activated for 100 milliseconds with a 2.5 second pause. Used for the Ambient temperature warning. Chime T1 and T2 - activated for 100 milliseconds with a 2.5 second pause. Used for LIMIT/CODE warning. Chime T3 - Activated for 100 milliseconds with a 2.5 second pause. Used to indicate check control messages.

Test Function No. 14 - Read Self Diagnostic Error Bytes

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. Errors are stored in the EEPROM in the form of bytes and are displayed in hexadecimal form. The maximum five errors can be scrolled through using the trip reset button and are displayed as follows: 'DIAG: 1 90 84 040' - the first number shows the error location number 1 - 5. The following numbers show error source code, type of error and frequency of error occurrence.

T4 must be used to interrogate the EEPROM and convert the hexadecimal values into meaningful error descriptions.

Test Function No. 15 - Display of Input/Output Port Status

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. The individual ports can be scrolled through using the trip reset button. 'PORT: A03 11010001' - shows the inputs and outputs for microprocessor 1 in binary format. 'PORT: B01 01001110' - shows the inputs and outputs for microprocessor 2 in binary format.

This function allows for rapid vehicle diagnostics by displaying the status of each microprocessor inputs and outputs in binary format. T4 must be used to read the binary code and interpret the code meanings.

Test Function No. 16 - Momentary Value for Engine Oil Temperature

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19.This function shows the momentary value for the engine oil temperature which is updated every 200 milliseconds. 'OELTMP: 83°C'

The ignition must be in position II for the oil temperature to be displayed. The value is derived from a CAN message transmitted from the ECM. If an error occurs, the maximum displayable temperature of 207°C is displayed. The display is only available if set in the coding, if not, only dashes (-) are displayed.

Test Function No. 17 - Minute Counter for Radio Controlled Clock

1. This function is allocated for future use. Therefore the following blank message appears: 'RCC-EMPF.: - MIN'.

Test Function No. 18 - Dimming Parameters

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. This display comprises a block of six numbers which define the operating parameters of the instrument pack dimmer.

Test Function No. 19 - Lock/Unlock

1. The unlock code is known as a checksum of the VIN. The VIN can be obtained from Test Function No. 1. The last five numbers of the VIN are added together and the resulting figure equals the checksum. For example, if the VIN is XA137295 the checksum will equal 26, which in turn equals the unlock code. Enter the unlock as follows: When test function No. 19 is entered, 'LOCK : ON' is displayed Press the trip reset button once, 'LOCK : 00' is displayed Press the trip reset button until the unlock checksum is reached, i.e. 26 Press the check control button once, all test functions will be unlocked.

Note. All test functions will remain unlocked, even when the ignition is switched off.

Relock the test functions as follows

1. Go to test function No. 19 and press the trip reset button, 'LOCK : OFF' is displayed
2. Press the trip reset button a second time, 'LOCK : ON' is displayed
3. Press the check control button or switch the ignition off to relock the test functions.

Test function No. 20 - Entry of Correction Factor for Fuel Consumption

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. This function allows for the query and alteration of a correction factor for fuel consumption values. Display and entry of the correction value is a decimal form per thousand. 'KVBR: 0980' - this shows a correction factor of 980.

Entry of the correction factor is in the range of 750 to 1250. On production, the correction factor of 1000, corresponding to 1.000, is programmed into the EEPROM.Adjustment of the correction factor is possible using the trip reset button. Each press of the button decreases the factor by 1. When the minimum of 750 is reached, the display reverts to the maximum of 1250. If the trip reset button is pressed and held, the value is decreased in increments of 10 to shorten the setting time. When the desired correction value is reached, entry is achieved by pressing the check control button. The display moves to test function No. 21 The new correction value is calculated from the actual average fuel consumption value and the currently displayed correction factor. The average fuel consumption is calculated by filling the fuel tank at a pump and dividing the liters used by the distance travelled on the fuel used. The correction factor must relate to units of L/100km.The following formula must be used to calculate the correction value, where X = calculated fuel consumption, Y = fuel consumption recorded by on-board computer, Z = currently displayed correction factor:(X / Y) x Z = New correction value.

Test Function No. 21 - Software Reset

1. This function is locked and needs to be unlocked via the procedure in Function Test No. 19. This function activates a reset of the software by the processor. This can also be performed using T4.When function 21 is entered the display shows 'RESET?'. If the trip reset button is depressed the system reset will be performed. If reset is not required, exit the test function by pressing the check control button or turning the ignition off.

Warning Lamp Activation

The following warning lamps are illuminated directly by the instrument pack logic or by other control units connected to the instrument pack. The following table shows the warning lamp functionality.

Refer to WARNING LAMP COLOR AND BULB CHECK APPLICABILITY .

WARNING LAMP COLOR AND BULB CHECK APPLICABILITY

Scheme 15

Functionality for each warning lamp is described below. Some warning lamps, when illuminated, are accompanied by a chime from the sounder and a message in the instrument pack message center.

Glow Plug (Diesel models only)

The glow plug warning lamp is illuminated by the ECM and the instrument pack software. The glow plug warning lamp illuminates in an amber color when the ignition is moved to position II. There is no bulb check function for this lamp.

The lamp is illuminated by signals from the ECM which equate to the time which the glow plugs are energized. When the glow plug heating time is complete, the lamp is extinguished. The lamp illumination is accompanied by a message, 'PRE HEATING', in the message center.

The glow plug warning lamp also serves a second function for the EDC system. If a major EDC system fault occurs when the engine is running, the glow plug warning lamp will be illuminated permanently and a message generated in the message center. The driver must seek attention to the engine management system at a Land Rover dealer as soon as possible.

Dynamic Stability Control (DSC)

The DSC warning lamp is controlled by the ABS ECU and the instrument pack software. The lamp illuminates briefly in an amber color when the ignition is moved to position II. If DSC is selected off, the lamp remains illuminated.

When DSC is active, the lamp flashes to inform the driver that the system is regulating engine output and braking forces. If the warning lamp remains illuminated after the engine is started or illuminates when driving, the DSC system has a fault or DSC has been deselected using the fascia switch.

If the vehicle battery has been disconnected, the DSC will be deactivated and the warning lamp will remain illuminated at ignition on when the battery is reconnected. The DSC can be reactivated by driving the vehicle a short distance or by turning the steering fully from lock to lock with the engine running. Reactivation is indicated by the warning lamp extinguishing.

Hill Descent Control (HDC)

The HDC warning lamp is controlled by the ABS ECU and the instrument pack software. The lamp illuminates briefly in a green color when the ignition is moved to position II. The lamp is also illuminated when HDC is selected on and the vehicle speed is less than 20 mph (35 km/h).

If HDC is selected on and the vehicle speed is faster than the operating speed, the lamp will flash and a message 'NO HDC, SLOW DOWN' will be displayed in the message center.

If the use of HDC causes the brake discs to exceed their pre-determined temperature, the HDC initiates 'fade out'. The lamp flashes during 'fade out' and a message 'HDC TEMP.NOT AVAIL' will be displayed in the message center. When the brake discs have cooled, HDC is reactivated, the lamp illuminates and the message is removed from the message center.

Supplementary Restraint System (SRS)

The SRS warning lamp is controlled by the SRS DCU and the instrument pack software. The lamp illuminates briefly in a red color when the ignition is moved to position I (AUX). If a fault is detected in the SRS system, the DCU illuminates the SRS warning lamp continuously.

Anti-lock Brake system (ABS)

The ABS warning lamp is controlled by the ABS ECU and the instrument pack software. The lamp illuminates briefly in an amber color when the ignition is moved to position II. If the lamp remains illuminated or illuminates when driving, a fault with the ABS system has occurred.

If the vehicle battery has been disconnected, the ABS will be deactivated and the warning lamp will remain illuminated at ignition on when the battery is reconnected. The ABS can be reactivated by driving the vehicle a short distance or by turning the steering fully from lock to lock with the engine running. Reactivation is indicated by the warning lamp extinguishing.

General Brake Warning Emergency Brake Assist Warning

This warning lamp displays a number of conditions to the driver as follows. The lamp can be illuminated in an amber or red color depending on the existing fault condition. The lamp is illuminated, flashing alternately between an amber and red color, for a brief period with the ignition in position II. If no fault conditions exist, the lamp is extinguished after the bulb check period.

The functions of the general brake warning lamp are assigned in priority. Fault conditions which use a red illumination have priority over amber illuminated faults.

Brake Pad Wear

1. The front brake pads are fitted with a wear indicator system. The LH and RH pads are wired in series to the instrument pack which continuously monitors the circuit. When one or both pads wear to their allowed limit, the indicator circuit is broken and detected by the instrument pack software. The instrument pack illuminates the general brake warning lamp in a red color. The instrument pack simultaneously, transmits a message to the LCM which displays 'CHECK BRAKE PADS' in the message center. When the brake pads are replaced, the instrument pack withdraws the message and the warning lamp illumination when the ignition is in position II, the engine is not running and the vehicle is not moving for 30 seconds.

Electronic Brake Distribution (EBD) Warning

1. If a failure of the EBD function occurs, the ABS ECU passes a message to the instrument pack. The pack software illuminates the general brake warning lamp in a red color for as long as the fault condition exists.

Low Brake Fluid Warning

1. The brake fluid reservoir is fitted with a sensor which reports the fluid level to the LCM. When the ignition is switched to position II, the LCM checks the fluid level immediately. To prevent false warnings when the vehicle is moving, the LCM then monitors the fluid level with a 25 second delay. If the LCM detects a low brake fluid situation the LCM displays 'CHECK BRAKE FLUID' in the message center. Simultaneously, a message is sent to the instrument pack which evaluates the message via the pack software and illuminates the general brake warning lamp in a red color, accompanied by an intermittent chime from the sounder.

Emergency Brake Assist Warning

1. If a failure of the emergency brake assist function occurs, the ABS ECU issues a CAN message which is received by the instrument pack. The instrument pack illuminates the general brake warning lamp in an amber color for as long as the failure message is present on the CAN.

Handbrake

The handbrake warning lamp is controlled by the LCM and the instrument pack software. The lamp is illuminated in a red color briefly with the ignition in position II. If the handbrake is applied, the lamp remains illuminated, until the hand brake is released.

If the vehicle is driven with the handbrake applied, the LCM monitors the vehicle speed. When the speed reaches 3 mph (5 km/h), the LCM displays 'RELEASE HANDBRAKE' in the message center, accompanied by an intermittent chime from the sounder for 20 seconds.

Engine Oil Pressure

The lamp illuminates in a red color at all times with the ignition in position II and the engine not running. If the lamp remains illuminated when the engine is started or illuminates when driving, the engine oil pressure is low and the engine must be stopped immediately to prevent serious damage to the engine internal components. When the lamp illuminates with the engine running, the instrument pack displays 'STOP! ENGINE OIL PRESS' in the message center.

Battery Charge Indicator

The battery charge indicator warning lamp is controlled by the ECM and the instrument pack software.

The battery charge indicator illuminates in a red color with the ignition in position II and the engine not running. If the lamp remains illuminated when the engine is started or illuminates when driving, the alternator charge output has failed.

Rear Fog Lamp

The rear fog lamp operation is controlled by the LCM. The rear fog lamps can only be selected on when the ignition switch is in position II, the light switch is in the side lamp or headlamp position and the front fog lamps are selected on. The rear fog lamp warning lamp illuminates when the rear fog lamps are active. The warning lamp is extinguished if the rear fog lamps are selected off, the front fog lamps are selected off, the light switch is selected off or the ignition is switched off.

Front Fog Lamp

The front fog lamp operation is controlled by the LCM. The front fog lamps can only be selected on when the ignition switch is in position II and the light switch is in the side lamp or headlamp position. The front fog lamp warning lamp illuminates when the front fog lamps are active. The warning lamp is extinguished if the front fog lamp is selected off, the light switch is selected off or the ignition is switched off.

Malfunction Indicator Lamp (MIL) (Check Engine Soon - NAS)

The MIL operation is controlled by the ECM and the instrument pack software. The lamp illuminates in an amber color at all times with the ignition in position II and the engine not running. When the engine is started, the MIL is extinguished, providing that no OBD related faults are active. If the MIL remains illuminated or illuminates when driving, a fault is present and must be investigated as soon as possible.

Cruise Control

The cruise control lamp is controlled by the ECM and the instrument pack software. The cruise control lamp is not illuminated as a bulb check when the ignition is in position II. The lamp illuminates to indicate to the driver that cruise control has been selected on. The lamp does not inform the driver of the status of the cruise control, i.e.; engaged or not engaged.

Seat Belt

The seat belt warning lamp is controlled by the SRS DCU, the LCM and instrument pack software.

On vehicles in markets where seat belt buckle switches are not required, the seat belt warning lamp is illuminated in a red color briefly with the ignition in position II.

On vehicles in markets where seat buckle switches are required, the seat belt warning lamp is illuminated in a red color with the ignition in position II. The lamp is only extinguished when the seat belt buckle switch contacts are broken by fastening of the seat belt. The illumination of the lamp is accompanied by 'FASTEN SEAT BELTS' displayed in the message center and an intermittent chime from the sounder.

Low Fuel Warning

The low fuel warning lamp, located in the fuel gauge, is illuminated in an amber color briefly with the ignition in position II. The warning lamp is controlled by the instrument pack software which measures the output signals from the tank level sensors. If the fuel level falls to or below 12 liters, on V8 models and 10 liters, on T6 models, the instrument pack illuminates the lamp to inform the driver of the low fuel level.

See also:
• DESCRIPTION
• REDUNDANT DATA
• ENGINE OIL PRESSURE
• Instrument Pack Test
• Test Function No. 19 - Lock/Unlock