Combination Instrument Function - GF54.30-D-0008TSA
Model 907
Standard instrument cluster shown
Instrument cluster standard
The standard instrument cluster has two large analog displays for vehicle speed and engine speed. The 3.5 "great black and white pixel matrix display shows:
- Time
- Outside temperature
- Fuel and AdBlue
- Total distance covered and daily distance covered
- Gear indicator
- The trip calculator
- If necessary, status displays of existing driver assistance systems
A display field arranged above the pixel matrix display contains warning and control lights. The multifunction display is operated using buttons on the instrument cluster or, optionally, using the steering wheel buttons.
Combined instrument with color display shown
Instrument cluster with color display
The instrument cluster with color display (with code JK5 (instrument cluster with color display)) has two great analog displays with chrome rings for:
- Vehicle speed
- Engine speed
- Fuel gauge
- Coolant temperature
A centrally located high-resolution 5.5; color display & rdquo; enables clear menu navigation in the driver's field of vision. All information can be selected and displayed in the menu, depending on the selected vehicle equipment:
- Navigation
- Radio
- Media
- Phone
- Service
- Vehicle settings
- Driver assistance system
- The travel calculator with eco score and average consumption
The menu is selected on the multifunction steering wheel using the top left touch control field.
Task
The instrument cluster provides information on dynamic and static vehicle conditions. Corresponding warnings are issued if errors occur.
The following displays are possible:
- Permanent displays (e.g. speed, engine speed, tank content)
- Control lights (green, yellow or blue) (e.g. flashing light, high beam)
- Warning lights (red) (e.g. coolant level, brake fluid level)
- Multifunctional display (e.g. driver assistance systems, menu sequence)
The instrument cluster activates the warning buzzer to output warning and control tones.
Standard instrument cluster shown
Block Diagram (Model 907 shown)
Function in general
The following partial functions can be carried out on the instrument cluster:
- Activate the instrument cluster.
- Control and warning light test
- Show operating status.
- Comfort displays
- The trip computer (RRE)
- Control and warning messages
Activate the instrument cluster
The instrument cluster is activated by unlocking the vehicle.
Control and warning light test
The control and warning light test is carried out automatically each time terminal 15 is switched on.
For this purpose, all control and warning lights, except the control lights for outside lighting, flashing light and pre-glow, are activated until the engine starts.
Show operating status
The following operating states are displayed on the instrument cluster:
- Display of the speed
- Display of the engine speed
- Display of the coolant temperature
- Distance displayed
- Display of the amount of fuel
- Gear display and drive program display (with automatic transmission)
- Display ECO (with code MJ8 (ECO start-stop function))
- Transport mode display
Display of the speed
The control unit ESP sends the wheel speed signals to the instrument cluster. This calculates the vehicle speed from this, compares it with the internally stored speedometer characteristic and controls the speedometer accordingly via a stepper motor.
Display of the engine speed
The CDI or ME control unit sends the engine speed signal to the instrument cluster. This controls the tachometer accordingly via a stepper motor.
Display of the coolant temperature
The CDI or ME control unit sends the coolant temperature signal to the instrument cluster. This controls the coolant temperature display accordingly.
The coolant temperature display is controlled via a correction characteristic. This correction characteristic defines the following temperature ranges in which the coolant temperature display is controlled differently:
- 0 to 80 ° C: The actual coolant temperature is displayed. However, the display only takes place from 40 ° C.
- 80 to 115 ° C: The coolant temperature display shows a constant value of 90 ° C.
- 115 to 120 ° C: The coolant temperature display shows a constant value of 95 ° C.
- 120 to 130 ° C (start of red warning area): The coolant temperature display shows the actual coolant temperature.
At coolant temperatures> 130 ° C, the instrument cluster also activates the coolant temperature warning light. A corresponding warning appears on the multifunction display. If the instrument cluster does not receive a value for the coolant temperature, it activates the coolant temperature warning light. The coolant temperature display is then not activated.
Distance displayed
The instrument cluster calculates the distance covered from the wheel speeds, taking the tire circumference into account.
Display of the amount of fuel
The level of the fuel tank is recorded by the level sensor integrated in the fuel pump with level sensor. The fuel pump control unit sends the corresponding signal via the drive CAN, drive train control unit, chassis FlexRay, electronic ignition lock control unit and the CAN user interface to the instrument cluster. This controls the fuel gauge accordingly.
When the reserve area is reached, the instrument cluster activates the fuel reserve warning light. A corresponding message also appears on the multifunction display.
The reserve area is defined by comparing the measured level with the tank curve stored in the instrument cluster. When the reserve area has dropped to approx. 50%, the menu Range instead of the distance, a pump symbol is shown.
Display behavior of the fuel gauge:
- After switching on terminal 15, the current full level is displayed.
- In the first 4 s after the engine has started, the display value is updated every 0.8 s in order to obtain a value under full on-board voltage. The display is then updated via damping.
By comparing the change in the level of the fuel tank with the calculated average consumption, a defective level sensor is detected. A corresponding message appears in the multifunction display.
Gear display and drive program display (with automatic transmission)
The fully integrated transmission control unit (VGS) (N15 / 11) sends the gear and drive program information to the instrument cluster. This shows the gear display and the driving program display in the multifunction display.
Display ECO (with code MJ8 (ECO start / stop function)) The CDI or ME control unit sends the status of the ECO start / stop function to the instrument cluster. The operational readiness of the ECO start / stop function is indicated to the driver in the multifunction display by the "ECO" symbol. displayed.
Transport mode display
When the transport mode is activated, the message Transport mode and the state of charge of the on-board power supply battery is displayed in 40 levels in the form of a bar chart.
Comfort displays
The comfort displays provide a quick overview of the following information:
- Display of the outside temperature
- Time display
- Dial illumination of the instrument cluster
Display of the outside temperature
The SAM control unit sends the outside temperature to the instrument cluster.
In order to be able to display the actual outside temperature, the following parameters must also be taken into account:
- Vehicle speed (falsification by airstream)
- Coolant temperature (falsified by radiant heat)
The CDI or ME control unit sends information on the coolant temperature to the instrument cluster.
The values of the coolant temperature influence the display of the outside temperature as follows:
- Coolant temperature 60 ° C:
The current outside temperature value is always displayed.
- Coolant temperature> 60 ° C and signal engine running or Powertrain ready for operation set:
- At vehicle speeds 20 km / h (when the vehicle decelerates) the display of the outside temperature is only changed if the measured outside temperature value drops.
- At vehicle speeds of 20 to 45 km / h, rising outside temperatures are displayed after a delay of 3 minutes.
- At vehicle speeds> 45 km / h, rising outside temperatures are displayed after a delay time of 90 s.
The control unit ESP calculates the vehicle speed from the wheel speeds and sends the calculated vehicle speed to the instrument cluster.
- Coolant temperature> 60 ° C and signal engine running or Powertrain ready for operation not set:
A delay time of a maximum of 1 hour prevents an apparently increased outside temperature from being displayed due to the engine's warmth. An increase in the display value is not permitted during this delay time. With Terminal 15 OFF the last measured outside temperature value is saved and displayed when reactivating.
If the outside temperature has fallen below the saved value in the meantime, the currently measured outside temperature is displayed after 8 s.
The display range for the outside temperature is between -40 and 85 ° C or between -40 and 185 ° F.
If the combination instrument receives no or implausible values for the coolant temperature, the display of the Outside temperature is controlled as if the coolant temperature were> 60 ° C.
Time display
The radio (Audio / COMAND) sends information about the time to the instrument cluster.
Dial illumination of the instrument cluster
When the instrument cluster is activated, the dial lighting is switched on. The instrument cluster automatically adjusts the brightness to the ambient brightness.
The trip computer (RRE)
The RRE provides data and information on average fuel consumption, travel time, average speed, distance traveled and range, which it displays as follows:
- From the start (Short-range storage)
- From reset (Long distance storage)
- Current fuel consumption
The information displayed relates to the time of the last reset of the short-range memory ("from start") or of the long-range memory ("from reset").
The information is shown in the multifunction display of the instrument cluster as follows:
- Distance covered
- Elapsed time
- Average consumption
- Average cruising speed
The RRE comprises the following sub-functions:
- Display of the distance from start / reset
- Display of the time from start / reset
- Average speed display
- Display of current consumption and average consumption
- Display of the range
Display of the distance from start / reset
The display of the distance From the start occurs in a range from 0 to 9999 km.
The distance From Reset is analogous to the route From the start calculated, but a range from 0 to 99,999 km is displayed here.
Display of the time from start / reset
With Terminal 15 ON the time from the start is added up by means of a timer. The display takes place over a range from 0 to 999 hours and 59 minutes.
The time from the reset is determined in the same way as the time from the start, but here the display is in a range from 0 to 9999 h and 59 min.
Average speed display
The RRE calculates the average speed from the relationship between the distance traveled and the time (travel time) since the short- or long-distance memory was last reset.
Display of current consumption and average consumption
The CDI or ME control unit sends information on fuel consumption to the instrument cluster. This calculates the current and average consumption.
Display of the range
The expected range is calculated from the relationship between the current tank content and the average fuel consumption.
Keys for operating the instrument cluster
Depending on the equipment of the vehicle, the buttons for operating the instrument cluster are installed on the instrument cluster or on the steering wheel. Function and operation are described in the individual systems and the operating instructions.
Control and warning messages
The messages shown in the multifunction display are divided into 4 categories according to their urgency:
- Category 1 (messages with the highest priority): Messages of category 1 indicate dangerous conditions and situations and have priority over messages with lower priority.
These messages are displayed within a maximum of 2 seconds after their occurrence, automatically stored in the message memory and cannot be acknowledged. When it occurs, a short warning tone is output via the instrument cluster loudspeaker.
- Category 2 (messages with medium priority):
Category 2 messages require the driver to intervene and appear with a time delay of a maximum of 2 seconds.These messages also include operating pressure messages. Category 2 messages can be acknowledged. When they occur, a warning tone is output via the instrument cluster loudspeaker.
- Category 3 and 4 (messages with low priority):
These messages are only used to inform the driver (e.g. low washing water level). There is no beep.
If several messages with the same priority occur, the currently displayed message is overlaid by the new message after the minimum display time has elapsed.
The following menus are available depending on the equipment
- Service
- Assistance
- Travel
- Navigation
- Radio
- Media
- Phone
- Settings
Functions in the menu: Service
- Messages
- AdBlue®
- Tire
- ASSYSTPLUS
- Engine oil level
- Soot particle filter
- Long-term consumption
Functions in the menu: Assistance
- Assistant graphics
- "Attention Level"
Functions in the menu: Travel
- Standard display
- Range and current fuel consumption
- ECO display
- The trip calculator
Functions in the menu: Navigation
- Distance to the next destination, estimated time of arrival, distance to the next maneuver, street currently being driven on
- Direction of travel
- New route
- Street not captured
- No route
- No map
- Target area reached
Functions in the menu: Radio
- Frequency range
- Channel list
Functions in the menu: Media
- Media source selection list
- Current playback
Functions in the menu: Telephone
- Recent calls
- Phone book
- Call status
Functions in the menu: Settings
- Light (adjust instrument lighting)
- Vehicle (switch rain sensor on and off)
- Adjust heating.
- Display and operation (permanent display of AdBlue® level on and off)
| Function diagram of the electrical system, instrument cluster, comfort display | Model 907 | PE54.30-D-2056-97TSA |
| Functional diagram of the electrical system, instrument cluster, trip computer | PE54.30-D-2057-97TSA | |
| Overview of system components, instrument clustert | GF54.30-D-9994TSA |