Instrument functions

In the case of the instrument functions, the following functions are available in different display areas:

Needle display area

• Instrument cluster supply
  
• Speedometer
  
• Rev counter
  
• Dimming, needle area
  
• Display heater
  
• Stages, cruise control
  
• Active cruise control
  

Instrument displays

• Fuel gauge
  
• Total distance and trip distance traveled
  
• Dimming, display area
  
• Fuel consumption (economy) display
  
• Clock
  
• Outside temperature
  
• Navigation display
  
• Check Control display
  
• ACC Adaptive Cruise Control display
  
• Display heater
  
• Transmission program display
  

Warning and signal displays

• Variable indicator lamp
  
• Airbag indicator lamp
  
• Belt warning
  
• Check Engine
  
• Anti-lock braking system
  
• General brake warning lamp
  
• Brake warning
  
• Dynamic Stability Control warning lamp
  
• Parking brake control
  
• Turn signal indicator lamps
  
• High beam indicator lamp
  
• Low beam indicator lamp
  
• Front fog lamp indicator lamp
  
• Rear fog light indicator lamp
  
• Brake warning light
  

Acoustic signals

• Acoustic transmitter (external)
  

On-board computer functions

• On-board computer display
  
• On-board computer button, left and right
  

Brief description of components

CAS Car Access System

The CAS Car Access System contains the functions of the radio remote control, the ignition starter button, the terminal control and the immobilizer. It is also the gateway module between the K-CAN SYSTEM and K-CAN PERIPHERALS data buses.

ZGM (Central Gateway Module)

The ZGM central gateway module connects the BYTEFLIGHT, K-CAN SYSTEM, PT-CAN data buses and the DIAGNOSTIC BUS.

K-CAN SYSTEM data bus

The K-CAN SYSTEM data bus is the data connection between the instrument cluster and the control modules in the chassis and suspension, drive and body sections. Information is exchanged with data telegrams.

MOST bus

The MOST bus is the data connection between the control modules in the communications section (navigation system, ASK audio system controller, SVS language processing system, CD control display). Information is exchanged with data telegrams.

LM Light Module

The LM light module controls and monitors the vehicle lights. Information is received and sent via the K-CAN SYSTEM data bus.

DM Door Module

The door modules register the signals of the switches and sensors installed in the doors and control the drives installed in the doors. Information is received and sent via the data bus K-CAN PERIPHERY.

PM Power Module

The PM power module monitors the battery charge state and the closed-circuit current consumption of the car. In addition, the trunk lid lock is controlled via the power module. Information is received and sent via the data bus K-CAN PERIPHERY.

SZL steering column switching center

The SZL steering column switching center registers the signals of the switches and sensors installed on the steering wheel and the steering column. It also controls all the components located on the steering wheel and the steering column. Information is received and sent via the data bus BYTEFLIGHT.

Controller

The controller is the operating unit for the on-board computer. It is fitted at the front in the center armrest.

Instrument cluster

The instrument cluster is manufactured in several hardware versions for different markets and is installed as a single-part component with assorted displays in the instrument panel.

The instrument cluster accommodates the following displays:

• LC display:All the displays and messages (e.g. those of the on-board computer) are shown in the LC display, which is subdivided into six display areas.
  
• Needle instruments:Vehicle speed and engine speed are indicated by needle instruments which move over an LC display. The needles are driven by stepping motors.
  
• Fixed-position indicator lamps: The displays required by law are configured with permanently installed, standardized indicator and warning lamps.
  

The indicator and warning lamps as well as the backlighting of the LC display are designed as single or multicolored non-replaceable LEDs.

A built-in display heater ensures that the display can be easily read even at low temperatures. The display heater is activated at display temperatures < 10°C. The switch-on signal is sent when the driver's door is opened from the CAS via the K-CAN SYSTEM data bus to the instrument cluster.

A control module for converting the input and output signals and two computers are integrated in the instrument cluster.

• One computer is for the display, lighting, on-board computer and Check Control functions.
  
• The other computer is for activating the needle instruments and the permanently installed indicator and warning lamps.
  

The instrument cluster is connected by way of the K-CAN SYSTEM data bus and the MOST to the vehicle electrical system. Information/prompts to and from the instrument cluster are transmitted as data telegrams.

Information is fed over conventional lines from:

• Outside temperature sensor
  
• Washer fluid level sensor
  
• Coolant level sensor
  
• Fuel tank sensor
  

Main functions

Display areas of instrument cluster

Display area 1: LC display

Display area 1, inside the speedometer

Contents can be displayed in this area as text and graphics:

• Speed limit: To avoid overspeeding (e.g. when winter tires are fitted), it is possible to set a speed limit via the on-board computer.
  The set limit is indicated by a bright circle segment, which begins at the limit and stretches round to the end of the scale. An acoustic signal sounds if this limit is exceeded.
  
• Vehicle speed controller: The vehicle speed controller can be used to store and call up to six speed markers as round markings. Values often required, such as e.g. 50 km/h, can be selected by pressing a button without the driver having to approach the speed exactly beforehand.
  When cruise control is active, a bright arrow marks the speed at which the car is being controlled at that moment. If the function has been deactivated e.g. by braking, the speed at which the car was last being controlled while driving is marked by a dark arrow.
  
• Diagnostic test function:A total of 21 test functions can be selected in the display area inside the speedometer with the trip odometer reset button in the top left corner of the instrument cluster. The content of the test function selected is shown in the display area inside the rev counter.
  
• CBS Condition Based Service reset:The CBS restet functions can be selected in the display area inside the speedometer with the trip odometer reset button in the top left corner of the instrument cluster. The content of the function selected is shown in the display area inside the rev counter.
  

Display area 2, inside the rev counter

Contents can be displayed in this area as text and graphics:

• Variable rpm early warning zone: In addition to the fixed rpm early warning zone (broken red line) and the fixed rpm warning zone (continuous red line), a variable rpm early warning zone can be overlaid below these markings.
  In this way, a maximum rpm recommendation is displayed depending on the engine operating state and this goes out when the engine reaches normal operating temperature.
  
• Navigation display: The guidance indicator (round arrow), the next intersection and the distance to the next intersection are shown as navigation displays.
  Until before the next turnoff point, the distance to this point is indicated numerically. Thereafter the distance is indicated with a bar graphic. The bar decreases continuously until the car turns off.
  The navigation system determines whether the distance to the next turnoff point is indicated numerically or graphically.
  The data are transmitted from the navigation system in the form of a telegram via the MOST bus to the instrument cluster.
  

Display area 3, below the speedometer

Contents can be displayed in this area as text and graphics:

• SBA service indicator: If there are no messages from the SBA service indicator, the fuel gauge or the fuel range is displayed here (depending on the setting).
  
• BC on-board computer displays: By pressing the BC on-board computer button on the turn indicator/dipping lever, it is possible to switch between the BC displays.
  

Display area 4, below the rev counter

Both BC and CC messages are displayed in this area. BC text messages are overwritten by CC text messages.

Most text messages are supplemented by the overlay of a symbol matching the message in the variable display and warning field (display area 5).

Display area 5, variable display and warning field

This area serves as a variable display and warning field. Contents can be displayed here as text or graphics.

• CC Check Control warning symbols: Each CC text message in display area 4 is assigned a symbol which shows up red or yellow in this area.
  If there are no incoming CC messages, the outside temperature and time are permanently displayed.
  
• Outside temperature: The display resolution is 0.5°C. If the temperature drops below +3°C, a message with an acoustic warning is issued.
  The displayed outside temperature is a value calculated by the instrument cluster taking into account the coolant temperature and vehicle speed.
  
• Time: The quartz clock integrated in the instrument cluster can be manually set by means of the controller in the control display.
  In cars fitted with navigation systems, the time, once it has been manually set, is corrected in the minutes range on the basis of the UTC (United Time Coordinated) world time received by the navigation system.
  Because only the deviation of the minutes setting in the ±2.5 minutes range from the actual time is corrected by the navigation system, the hour display has to be set manually.
  A clock that is manually set outside the correction range runs as a normal quartz clock.
  The instrument cluster is the time master for all the other control modules. The time information is made available to the other control modules as a telegram via the K-CAN SYSTEM data bus.
  Time and outside temperature are displayed from terminal R ON.
  

Display area 6, gear indicator

In Steptronic mode, the gear selected by the transmission (M1 to M6) is displayed in this area.

S is displayed here in driving program position D and with the S program activated.

Display area 2, needle instrument: Speedometer

The speedometer scale and the scale captioning are represented on the permanently arranged graduated dial.

The needle is moved by a stepping motor.

The speed indication is derived from signal sampled at the left rear wheel sensor and directed to the DSC control module. The signal (distance signal) conditioned by the DSC control module is sent in the form of a telegram via the PT-CAN to the ZGM and on via the K-CAN SYSTEM to the instrument cluster.

Display area 3, needle instrument: Rev counter

The rev counter scale and the scale captioning are represented on the permanently arranged graduated dial.

The graduated dial features an rpm advance warning zone (broken red line) followed by an rpm warning zone (continuous red line).

The needle is moved by a stepping motor.

The engine speed signal is sent by the DME via the PT-CAN to the ZGM and on via the K-CAN SYSTEM to the instrument cluster.

Display area 4: Indicator and warning lamps

The indicator and warning lamps are permanently arranged in-between and next to the needle instruments. The symbols are backlit for display purposes by colored and multicolored LEDs.

In this way, the symbols show up red, yellow, green or blue, depending on their importance.

The standardized indicator and warning lamps required by law are:

• Turn signal light
  
• High beam
  
• Belt warning
  
• Airbag
  
• General brake warning
  
• Rear fog lights, front fog lamps
  
• OBD II Check Engine (MIL)
  

This area also contains the indicator and warning lamps for:

• DSC Dynamic Stability Control
  
• Program display of automatic transmission
  

Program display of automatic transmission: The arrows next to the program display (transmission program stages P, N, D, R) indicate the possible direction of movement of the transmission selector lever on the steering column.

The program display remains activated

• for 10 seconds after removal of the remote control (run-on function) a n d
  
• for up to 30 minutes with the engine switched off (terminal 15 OFF) and driving position N selected.
  

The 30-minute display serves as a reminder that position P was not selected when the car was parked. The parking gear is automatically activated after the 30 minutes have elapsed.

Full control of the program and gear display is performed by the EGS control module.

All other indicator and warning information is displayed with the relevant symbol in the variable warning field.

Predrive check:The predrive check serves to check the internal functions of the instrument cluster and to monitor the alive signals of all the control modules which can issue a CC message.

• All the fixed indicator lamps are simultaneously activated shortly after terminal 15 ON. EXCEPTION: Airbag is already activated from terminal R.
  
• Indicator lamps which can light up red and yellow (parking brake and brake warning) light up yellow first and then switch to read after approx. two seconds.
  

The entire predrive check lasts at least four seconds.

The alive signals of all the control modules which can issue a CC message is checked during the predrive check.

All the indicator lamps are deactivated together at the end of a fault-free predrive check.

If faults occur during the predrive check, the check is interrupted for the relevant systems.

The affected indicator lamps remain on and the Check Control issues the associated message.

Illumination and dimming

Illumination:The display areas are backlit and the needles and graduated dials illuminated by LEDs in BMW orange.

The individual display areas are only backlit when information is actually being indicated there. EXCEPTION: Set speed limit. Two adjacent display areas are always backlit simultaneously.

The needles and graduated dials are only illuminated when the driving lights are switched on and thus also serve as function indicators for ”driving lights ON”.

Dimming: The brightness of the LC display and all the indicator and warning lamps is adapted with the aid of a phototransistor to the relevant light conditions.

The contrast of the LC display is adjusted automatically as a function of the LCD temperature and the operating time.

The contrast voltage is adapted to the temperature by the electronics in the instrument cluster through the use of an NTC resistor in the LC display.

The brightness signal is calculated in the instrument cluster from the values of the phototransistor and the dimmer potentiometer (setting of dimmer control wheel). This brightness signal is made available via the K-CAN bus to the other control modules (”dimmer master” function).

To take into account time-dependent aging, the non-operating and operating time of the instrument cluster is recorded with a built-in timer. The contrast voltage is automatically adapted as a function of the increasing operating time (increasing aging).

Turn signal indicator acoustics

A speaker is integrated in the instrument cluster to issue an acoustic signal when a turn signal indicator is activated. The acoustic signals are generated by an integrated sound generator.

All other acoustic signals are generated by the ASK audio system controller and output through the car speakers.

Trip odometer reset button

The following functions can be executed with the trip odometer reset button in the top left corner of the instrument cluster:

Brief pressing functions: When the ignition is off, the following are displayed for eight seconds when the trip odometer reset button is pressed briefly:

• Trip distance
  
• Time
  
• Outside temperature
  

The displayed trip distance is reset when the trip odometer reset button is pressed again within this period.

Long-term pressing functions: When the ignition is off, the following functions are triggered when the button is pressed for longer than two seconds:

• The ABS ISO symbol is displayed in the variable warning field for two seconds (US market).
  
• The test functions are activated.
  
• The SBA service indicator is reset.
  

Switch-on scenarios

Terminal 30:After the driver's door has been opened, the parking brake light comes on and the display heater is activated depending on the temperature when the parking brake is activated.

Trip distance, time and outside temperature are displayed when the trip odometer reset button is ”briefly pressed”. Only the display areas inside the speedometer and the rev counter are backlit.

Terminal R:After terminal R ON, the time and the outside temperature are indicated in the display area inside the speedometer. Only this display area is backlit.

Existing CC messages are indicted in the display area inside the rev counter.

Terminal 15:The predrive check is activated from terminal 15 ON. The program display of the automatic transmission is then shown in addition to the time and outside temperature.

The BC information can also be called up by means of the buttons on the turn indicator/dipping lever.

The overall distance/trip distance is briefly indicated in the display area inside the rev counter. The service information is indicated in the display area below the speedometer. The display then switches to indication of the previous information, e.g. fuel level and consumption.

Existing CC messages are indicated instead of the overall distance/trip distance in the display area inside the rev counter.

Once the engine is running, the variable rpm early warning zone is indicated in the display area inside the rev counter as long as the engine speed threshold transmitted by the DME is below the fixed warning zone.

The marking ring is only indicated in the speedometer if thresholds have been set for the vehicle speed controller and/or the LIMIT function has been activated.

The display areas of the speedometer and the rev counter are only backlit when one of the display functions is active. Both display areas remain dark when only the LIMIT display is active.

Redundant data storage

Data must be retained when the instrument cluster is replaced so that tampering can detected. For this purpose, the following data are stored redundantly (for a second time) in the CAS Car Access System:

• Vehicle identification number
  
• Total distance (kilometer reading)
  
• CBS scopes
  

These data are checked each time terminal 15 is switched on. If discrepancies are detected, an orange tampering dot lights up in the display area below the rev counter. This occurs in the following situations:

• The vehicle identification numbers stored in the two control modules are different.
  
• A vehicle identification number is not stored in one of the two control modules (e.g. new part).
  
• The module for storing the total distance traveled in the instrument cluster is faulty and the kilometer reading is indicated as 999999.
  

Observe the following when replacing the instrument cluster:

Installing a new CAS:

• Order CAS specifically to vehicle with key number, vehicle identification number, standard equipment.
  
• The engine can be started after the new CAS has been encoded with MoDiC or DISplus (engine control/CAS calibration).
  
• NOTE: If a used CAS control module is installed, it will not be possible to unlock the car and start the engine.
  

Installing a new instrument cluster

• The tampering dot is set after terminal 15 is switched on because the vehicle identification number is not yet encoded in the instrument cluster.
  
• Carry out encoding with the MoDiC or DISplus and allocate the instrument cluster to the vehicle (entry of vehicle identification number in instrument cluster).
  
• Switch terminal 15 off and on. Once terminal 15 has been switched on again, the current km reading and the CBS data are transmitted from the CAS to the instrument cluster. The tampering dot is deleted.
  

Trial installation of a new instrument cluster

• Although the vehicle identification numbers in the instrument cluster and CAS are different or have not been entered in the instrument cluster, a bi-directional communication takes place between the instrument cluster and CAS.
  
• For example, the km reading stored in the CAS is transmitted to the main memory of the odometer in the instrument cluster and indicated.
  
• In a test drive, the kilometers covered are counted in the odometer main memory and transmitted to the CAS every 10 km.
  
• If at least 24 hours have passed between deactivation and activation of terminal 15, a further calibration is performed regardless of the kilometers covered.
  
• The main memory loses the stored kilometer reading when the instrument cluster is removed after a test drive. The data are not stored and the instrument cluster is returned to its initial state.
  
• NOTE: With a used instrument cluster, the entered vehicle identification number can be overwritten up to a kilometer reading of 254 km. It is not possible to reset the permanently stored value.
  

Simultaneous replacement of CAS and instrument cluster

Avoid replacing two new components simultaneously as the current km reading and all the CBS data will be irrevocably lost.

If the simultaneous replacement of both control modules cannot be avoided, it is recommended to adhere to the following installation sequence:

Replacing instrument cluster:

• Encoding of vehicle identification number
  
• Terminal 15 OFF and ON (data transmission possible if necessary)
  

Replacing CAS:

• Encoding of vehicle identification number
  
• Terminal 15 OFF and ON
  

The tampering dot is deleted after terminal 15 is switched on again. Communication between instrument cluster and CAS for redundant data storage is now guaranteed.

Diagnosis

The instrument cluster is a diagnostic compatible system. Diagnosis and reading out of the fault memory in the instrument cluster are possible with the MoDiC or DISplus via the K-CAN SYSTEM data bus. The instrument cluster also has test functions, which are read out in its display.

On-board diagnosis: The instrument cluster carries out on-board diagnosis in order to monitor function and identify faults. Identified faults are stored if they have been detected three times as ”true”. New faults are not taken into consideration when the memory is full. Faults which no longer occur after 40x terminal 15 ON/OFF are automatically deleted when the memory is full. The fault memory can be read out with the diagnostic unit or in the instrument cluster display.

Test functions: The listed test functions can be displayed in the instrument cluster when the trip odometer reset button is pressed. The indication appears in the left display area inside the speedometer with an orange backlighting.

Calling up test functions:

• With terminal R (radio setting) or terminal 15 ON, press the trip odometer reset button for longer than five seconds o r
  
• with terminal R switched off, press and hold down the trip odometer reset button and switch on terminal R.
  

Displaying test functions:

• Identification :01
  
• System test :02
  
• (not occupied) :03
  
• Consumption :04
  

The test function number is increased each time the trip odometer reset button is briefly pressed.

A maximum of four test functions can be shown simultaneously.

Except for test functions 1 and 2, all test functions must be unlocked by means of test function 19.

Starting selected test function:Press trip odometer reset button for longer than two seconds.

Displaying selected test function: The selected test function is displayed inside the rev counter.

Terminating test function:

• Switch off terminal R (radio setting) o r
  
• Press trip odometer reset button for longer than six seconds.
  

NOTE: After completing the tests, lock the test functions in accordance with test function 19.

CC Check Control

The Check Control is a message system that reports faults in the vehicle and at the same time serves to display operating states and instructions.

• The message texts (max. 40 characters) contain clear instructions.
  
• In parallel with the CC messages, further information (max. 170 characters) pertaining to the current message can be called up or appear automatically in the on-board data menu of the control display.
  
• In addition to German, there are another 10 languages in which the texts can be displayed.
  

Display locations:The Check Control signals are displayed at several locations by fixed and variable indicator lamps in the instrument cluster.

• Variable indicator lamps light up yellow or red below the gear display. The time and the outside temperature normally displayed at this location are overwritten as required by the Check Control.
  
• Check Control text messages are displayed below the rev counter. Data from the on-board computer which are already located at this position when the message is output are overwritten.
  

Most of the Check Control messages have supplementary explanations and instructions available in the control display. These explanations and instructions can be called up via the on-board data menu or are automatically displayed in particularly serious situations.

Display behavior: Check Control messages are usually announced by a gong. The output takes the form of

• a text message with a fixed and/or variable indicator lamp,
  
• the text being featured in the display area below the rev counter and usually with an additional explanation in the control display o r
  
• a non-text message with a fixed indicator lamp.
  

If several text messages are poised to be output simultaneously or if one indicator lamp is to be activated simultaneously by various non-text messages, the message with the highest priority is displayed first.

In addition to the visual display, the Check Control alerts the driver with acoustic signals. Depending on the importance of the accompanying message, a gong or a double gong of differing volume and tone sounds. Depending on its cause, the acoustic warning is issued from the left or right front car speaker.

Operation:The Check Control messages can be called up with the CC button on the turn indicator/dipping lever. This is possible by:

• scrolling through with brief button pressing o r
  
• switching back and forth in the display area below the rev counter between the on-board computer and the Check Control.
  

The display automatically reverts to its initial state (rendering dark or on-board computer) eight seconds after the last button operation.

It is not possible to render the display dark if the Check Control is showing a top-priority message (e.g. engine overheating) or the fuel gauge indicates low fuel.

On-board computer

The on-board computer is installed in the control display and is operated with the controller. This computer contains assorted subfunctions.

”Main”on-board computer:The ”main” on-board computer will be referred to simply as the on-board computer in the following.

Displays: The computer supplies from terminal R data for the following displays:

• Distance:The distance can be input via the controller into the computer. The distance value is then counted down by the computer o r transmitted by the navigation system to the instrument cluster. In this case, the navigation system calculates down to ”0”. In both case, the instrument cluster continues counting the ”minus distance”.
  
• Range:The range is calculated from a mean consumption value and the tank content. Stationary periods while the engine is running and sudden changes in driving style are compensated in the calculation to the greatest possible extent.
  
• Arrival time:The arrival time is calculated from the distance, the time and a mean driving speed. The calculation is made in such a way that the displayed value changes minute by minute without sudden jumps. The arrival time can only be calculated if the clock has been set and a distance has been manually input. If the distance value has been adopted by the navigation system, permanent calibration is performed by the routing system on the basis of the road map data. This method makes it possible for the system to estimate the arrival time much more accurately.
  
• Average fuel consumption:The average consumption is calculated using the data from the consumption and travel memory. The calculation always begins with a manual reset. The display appears after the first travel pulse.
  
• Average speed:The average speed is calculated using the data from the travel memory and timer. The calculation always begins with a manual reset. The display appears after the first travel pulse.
  A reset of average consumption and speed is carried out via the controller directly in the menu of the on-board computer in the control display. A dialog window appears in the display shield when one of these displays is selected. Selective resetting is possible with the dialog window.
  Individual information from the on-board computer can be displayed in the instrument cluster.
  Display field below speedometer:This field can display distance and/or range; in addition tank content.
  Display field below rev counter:This field can display arrival time, average fuel consumption and average speed; in addition total and trip distance traveled o r present consumption.
  The additional displays can be called up in the control display.
  The stop watch, limit and memo functions and the timer for independent heating/independent ventilation are only displayed in the control display.
  When the car is started, the information that was selected last is always shown in the display areas of the instrument cluster.
  No function of the on-board computer can be displayed below the rev counter while a Check Control message is being displayed there. Such a display is only possible after a specified minimum display time has elapsed or after the message has been cancelled by button operation. A top-priority message cannot be removed.
  

Operation: The displays of the on-board computer can be called up and scrolled through with the buttons on the turn indicator/dipping lever. This is possible by:

• Long-term pressing of the top button switches back and forth in the display area below the rev counter between Check Control and on-board computer. Brief pressing scrolls through their functions.
  
• Brief pressing of the lower button scrolls through all the display options below the speedometer. Long-term pressing renders both displays dark.
  

It is not possible to render the display dark if a Check Control message is active or the fuel gauge indicates low fuel.

Both display fields are rendered bright or dark simultaneously. They cannot be rendered individually.

Trip computer:The trip computer serves to monitor individual stages, which can also be stopped or interrupted. The trip computer must be selected and activated in the on-board computer menu in the control display. The information of the trip computer is only displayed in the control display. It is not possible to display this information in the display fields of the instrument cluster.

The following are displayed by the trip computer:

• start time and start date
  
• Driving time and distance traveled
  
• Average fuel consumption and average speed
  

The trip computer is activated with the controller in the START selection field.

When a journey is interrupted, from terminal 15 OFF further calculation of the average values is discontinued (provided START or STOP is activated) and only started again when the journey is resumed.

The displays are frozen with the STOP selection field. Further calculation is no longer possible after the displays are frozen. Selecting START again resets all the displays of the trip computer jointly. Selective resetting of individual function is not possible with the trip computer.

Limit:A speed limit can be entered in the on-board computer via the controller and the control display. The entry can be made manually with the controller or the speed currently being driven can be adopted. The area above the input speed is represented inside the speedometer scale is represented by a bright circle segment. When the speed exceeds the input value, this is indicated by a gong and a Check Control message.

The function is ready for operation from terminal R ON. The warning when the input limit is exceeded can only be output in driving mode (terminal 15 ON and travel pulse telegram). The current speed limit and the associated activation status are stored in the instrument cluster also after terminal 15 OFF.

Stop watch: The stop watch function is ready for operation from terminal R. A running stop watch is stopped with terminal R OFF. The stop watch starts running again with terminal R ON.

The stop watch is started and stopped with the controller via the selection fields in the control display. A time interval can be called up when the stop watch is running. The maximum running time of the stop watch is 99 hours and 59 minutes. The stop watch remains at this value when this time has elapsed.

Settings:The following additional functions can be controlled via the on-board computer and displayed in the control display:

• Clock:The date and time must be manually input via the controller in the control display. The time is calculated and displayed in the instrument cluster. The time is also indicated in the control display.
  The time cannot be overlaid in the instrument cluster. The time features together with the indicated outside temperature in the LCD display field below the gear display. The display appears provided it is not overwritten by a variable Check Control indicator lamp.
  
• Memo signal: If the MEMO function has been activated and a time is set, the instrument cluster triggers from terminal R ON an hour signal 15 seconds before each full hour has elapsed. The function can be activated and deactivated in the control display.
  
• Timer for independent heating and independent ventilation:Two timers are fitted for each of the independent heating and independent ventilation functions. The timers are set in the A/C menu of the control display. The values for time, timer ID code and status are transmitted to and stored in the instrument cluster. At the prespecified time, the function is transmitted to the IHKA and the IHKA is activated.
  The functions ”independent heating ON”, ”independent ventilation ON” and ”automatic selection independent heating/independent ventilation” are possible - depending on the outside temperature. The ID code for the function is selected in the IHKA.
  
• Code:A code can be entered from terminal R ON in the Settings menu of the control display which prevents the engine from being started by unauthorized persons.
  During a starting attempt, the instrument cluster identifies the stored information ”code armed” and issues an input prompt via the Check Control. Only when the control display has confirmed input of the valid code to the instrument cluster does the instrument cluster signal enabling of engine starting to the DME control module.
  
• Unit conversion: Units can be converted by means of encoding with the Tester or at the control display. Usually entire display groups are converted here.
  

Country-specific version

The instrument cluster comes in different hardware versions for the following markets:

Europe

• Speedometer with km/h scale
  
• Rev counter for gasoline engine with scale to 7000 rpm
  
• 4 MB memory capacity
  

Europe with extended languages

This version contains additional characters for Japan, Korea, Taiwan.

• Speedometer with km/h scale
  
• Rev counter for gasoline engine with scale to 7000 rpm
  
• 8 MB memory capacity
  

Europe and US market

• Speedometer with mph scale
  
• Rev counter for gasoline engine with scale to 7000 rpm
  
• 4 MB memory capacity
  

Languages and units

Languages and units can be set via the control display.

Languages: The following languages are stored in the 4 MB language memory of the instrument cluster:

• German
  
• English (UK)
  
• English (US)
  
• French
  
• Italian
  
• Dutch
  
• Spanish
  

In addition to the above mentioned languages, the following languages are stored in the 8 MB language memory of the instrument cluster:

• Japanese
  
• Korean
  
• Chinese, traditional
  
• Chinese, simple
  

Units: The following units are stored in the instrument cluster:

• Temperature in °C and in °F
  
• Consumption in mpg US, mpg UK, km/l, l/100 km
  
• Date/time format for US and Europe
  
• Travel in km and miles
  

Language encoding

Language encoding:Depending on the language encoding of the CAS Car Access Systems, a language package is programmed in the control display which contains three of the above mentioned languages.

From these three languages, one language can be selected for the control display.

The settings can be stored as a key memory function. In this ways, the units and languages stored are displayed as a function of the key used (user).

K-CAN SYSTEM BUS

The instrument cluster communicates with control modules in the chassis and suspension, drive and body sections via the K-CAN SYSTEM data bus in the form of telegrams. The following information/data are transmitted:

• Speed: Telegram for displaying the vehicle speed and calculating the distance covered.
  Signal path: Left rear wheel sensor -> DSC control module -> PT-CAN -> ZGM -> K-CAN SYSTEM -> instrument cluster
  
• Transmission data:Telegram for displaying gear position, selected driving program and CC messages.
  Signal path: EGS control module -> PT-CAN -> ZGM -> K-CAN -> instrument cluster
  
• Engine speed:Telegram for displaying the engine speed.
  Signal path: DME -> PT-CAN -> ZGM -> K-CAN SYSTEM -> instrument cluster
  
• Outside temperature: Telegram with a mean outside temperature value for processing in other control modules. A value calculated in the instrument cluster from the current engine temperature and vehicle speed. It prevents the outside temperature signal from being excessively influenced by the air stream and waste engine heat.
  Signal path: e.g. instrument cluster -> K-CAN -> CD and/or IHKA
  
• CBS Condition Based Service messages:Telegrams from DME, DSC and IHKA with information on the current level of component wear. They are needed in the instrument cluster for the calculation of CBS displays and service dates.
  
• FAS turn indicator/dipping lever:Signal from FAS from terminal 30 with each operation of FAS.
  Signal path: FAS -> SLZ steering column switching center -> BYTEFLIGHT bus -> ZGM -> K-CAN -> as telegram among others to instrument cluster
  
• Driving direction:Signal for displaying the selected driving direction in the instrument cluster.
  Signal path: LM light module -> K-CAN SYSTEM -> as telegram to instrument cluster and AHM trailer module
  
• Bus status: Telegram with information on the status (bus active or in rest state) of the K-CAN SYSTEM data bus.
  Signal path: ZGM central gateway module -> instrument cluster
  
• Dimming: Signal with information on the adjusted brightness.
  Signal path: Dimmer control wheel -> LM light module -> as telegram to instrument cluster
  
• Driver's display, rpm range:Signal for displaying the variable rpm warning zone in the instrument cluster display.
  Signal path: DME -> PT-CAN -> ZGM -> K-CAN SYSTEM -> instrument cluster
  
• EMF parking brake:Telegram with information for the parking brake indicator lamp on the status of the EMF electromechanical parking brake.
  Signal path: EMF control module -> PT-CAN -> ZGM -> K-CAN SYSTEM -> instrument cluster
  
• Vehicle identification number:Telegram with the last seven positions of the VIN for redundant data storage for the allocation of instrument cluster and car. Signal path: CAS -> K-CAN SYSTEM -> instrument cluster
  Signal path: CAS -> K-CAN SYSTEM -> instrument cluster
  
• Vehicle type:Telegram with details of the vehicle type (model series, body type, transmission, engine, steering, country-specific type) for the allocation of the different vehicle versions and instrument cluster.
  
• Kilometer reading/range:Telegram with information for creating the fault memory entries (total distance traveled, tank fill level - right, left, total, reserve, calculated range).
  Signal path: Instrument cluster -> K-CAN SYSTEM -> further control modules
  
• Terminal status: Telegram with details of the relevant terminal status (terminal R, terminal 15, terminal 50, key inserted).
  Signal path: CAS -> K-CAN SYSTEM -> instrument cluster
  
• Lamp status:Telegram with details on the relevant status of lamp activation for high beam/headlight flasher, parking light, front fog lamps, rear fog light.
  Signal path: LM -> K-CAN SYSTEM -> instrument cluster
  
• LCD luminance: Telegram with a value calculated in the instrument cluster from the values of phototransistor and potentiometer (position of dimmer control wheel). The telegram is used by other control modules as a dimming signal.
  Signal path: Instrument cluster -> K-CAN SYSTEM -> control modules: CDC, SZL (switch illumination), LM
  
• Engine data: The telegram contains the engine data: engine temperature (corresponding to coolant temperature), engine oil temperature, engine oil pressure, alive counter of DME (function monitoring of DME), engine running status, injected fuel quantity (total of output fuel quantity).
  Signal path: DME -> PT-CAN -> ZGM -> K-CAN SYSTEM -> instrument cluster
  
• K-CAN network management: This telegram is transmitted and received by each control module. Each control module has a control module address which it using when transmitting and from which it identifies a network management message.
  
• RDA request/data storage:Telegram with the current data from redundant data storage.
  Signal path: CAS-> K-CAN SYSTEM -> instrument cluster a n d instrument cluster -> K-CAN SYSTEM -> CAS
  
• Power management, battery voltage: The telegram contains details on: battery voltage and status of battery master switch.
  Signal path: Power module -> K-CAN P -> K-CAN SYSTEM -> instrument cluster
  
• Relative time:The relative time is determined by a timer running synchronously to the system/on-board clock. The telegram with the relative time is used in other control modules for time calculation. The time of the on-board clock cannot be used for time recording because the clock can be set. The timer starts after a reset (e.g. disconnection of vehicle battery) at zero and counts up second by second. The DME determines the stationary time of the engine from the relative time terminal R OFF to terminal R ON again.
  
• Status, trailer: The signal indicates whether a trailer is electrically connected.
  Signal path: AHM -> K-CAN SYSTEM -> instrument cluster
  
• Status, damper program: The telegram indicates the status of EDC-K Electronic Damper Control (continuous) and is monitored by the instrument cluster. A corresponding fault message is displayed in the event of EDC-K malfunction.
  Signal path: EDC-K -> PT-CAN -> ZGM -> K-CAN SYSTEM -> instrument cluster
  
• Status, DSC Dynamic Stability Control program:The telegram contains status messages of the DSC program and fault messages.
  Signal path: DSC control module -> PT-CAN -> ZGM -> K-CAN SYSTEM -> instrument cluster
  
• EMF alive counter: The telegram is used for EMF function monitoring by the instrument cluster. A corresponding fault message is displayed in the event of a parking brake control module malfunction.
  Signal path: EMF control module -> PT-CAN -> ZGM -> K-CAN SYSTEM -> instrument cluster
  
• Time/date:The telegram contains the date and time and is transmitted to other control modules (e.g. to the wiper module for calculating the APS alternating park position).
  Signal path: Instrument cluster -> K-CAN SYSTEM -> other control modules
  
• Status, radio key: The telegram contains the personalization number of the radio key and the status of the key battery.
  Signal path: CAS -> K-CAN SYSTEM -> instrument cluster
  
• Status, instrument cluster: The telegram contains: displayed vehicle speed, unit speed km/h or mph, washer fluid fill level, status - vehicle speed controller interface, status - airbag warning lamp, relative timer, status - belt warning lamp, status - engine warning lamp, status - DSC indicator lamp, status - brake warning lamp, status - parking brake indicator lamp.
  Signal path: Instrument cluster -> control modules: DME, SIM and wiper module
  
• ZV and lid status: The telegram contains details of the central locking status, central locking control and the status of the door contacts and rear lid. The signals are needed for displaying the CC messages relating to the positions of doors, rear lid and central locking.
  Signal path: CAS control module -> K-CAN SYSTEM -> instrument cluster
  

Security function

Load cutout

The display heater is cut in/out by the power module as a function of the system voltage.