Display operating conditions, function - GF54.30-P-3041LE
MODEL 216.3, 221.0 /1 as of model year 2009 /YoM 08
Function requirements, general
- Circuit 15 ON
The EZS control unit (N73) places the status of circuit 15 on the chassis CAN (CAN E). The central gateway control unit (N93) forwards this to the instrument cluster (A1) via the central CAN (CAN F).
Display operating state, function (general)
The operating conditions display provides the driver with permanent information about the current operating conditions of the vehicle.
The Display operating conditions function is comprised of the following partial functions:
- Function sequence for vehicle speed display
- Display of engine speed function sequence
- Display of coolant temperature function sequence
- Display of fuel quantity function sequence
- Display of travel distance function sequence
- Function sequence, gear display and transmission mode display
- Function sequence for display of charge level of high-voltage battery (A100g1) (on model 221.095/195)
Additional function requirements for vehicle speed display
- Vehicle speed v > 0 km/h
Function sequence for vehicle speed display
The ESP control unit (N47-5) (except model 221.095/195) or the regenerative braking system control unit (N30/6) (on model 221.095/195) reads in the signals from the left front rpm sensor (L6/1), right front rpm sensor (L6/2), left rear rpm sensor (L6/3) and right rear rpm sensor (L6/4) directly and transmits them via the chassis CAN.
The central gateway control unit forwards these signals to the instrument cluster via the central CAN. The instrument cluster receives the signals from the rpm sensors, calculates the current vehicle speed and actuates the electronic speedometer (A1p8) by means of a stepper motor.
In the multifunction display (A1p13), the vehicle speed can also be displayed digitally. This function is selected in the "Trip" menu.
In the "Settings" menu, it is also possible to select an additional speedometer. This additional speedometer always shows the vehicle speed in the units not shown in the display in the instrument cluster, i.e. in miles per hour (mph) in the kilometers speedometer and in kilometers per hour (km/h) in the miles speedometer. On vehicles with code (833) Great Britain version, the additional speedometer is displayed permanently and cannot be deselected.
Additional function requirements for display of engine speed
- Circuit 61 ON
Display of engine speed function sequence
The engine speed is detected by the crankshaft Hall sensor (B70) (except engine 275) or by the crankshaft position sensor (L5) (with engine 275). The CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine) reads in the signals from the crankshaft Hall sensor or the crankshaft position sensor, uses them to calculate the engine speed and transmits a corresponding value on the chassis CAN. The central gateway control unit forwards this to the instrument cluster via the central CAN. The instrument cluster receives the value for the engine speed and actuates the tachometer (A1p5) accordingly by way of a stepper motor.
Display of coolant temperature function sequence
Coolant temperatures are monitored by the coolant temperature sensor (B11/4). The CDI control unit or the ME-SFI [ME] control unit reads in the signal from the coolant temperature sensor, uses it to calculate the coolant temperature and transmits a corresponding value on the chassis CAN. The central gateway control unit passes this value on to the instrument cluster via the central CAN. The instrument cluster receives the value for the coolant temperature and actuates the coolant temperature display (A1p1) accordingly.
Function sequence for fuel quantity display
The left tank half fuel level indicator sensor (B4/1) and the right tank half fuel level indicator sensor (B4/2) detect the fill level of the fuel tank. The rear SAM control unit with fuse and relay module (N10/2) reads in the signals from the fuel level indicator sensor and transmits them on the interior CAN (CAN B). The central gateway control unit forwards these signals to the instrument cluster via the central CAN.
The instrument cluster receives these signals, evaluates them and actuates the fuel level and reserve indicator (A1p2) accordingly by means of a stepper motor.
When the reserve range is reached, the instrument cluster actuates the fuel reserve warning lamp (A1e4). The reserve range is defined by comparing the measured fill level against a stored tank characteristic.
If the reserve range drops to approx. 50 %, a gas station symbol in the form of a gasoline pump is shown in the Range menu instead of the distance reading.
Display characteristics of fuel level indicator:
- After switching on circuit 15, the current fill level is displayed. In the process, the pointer runs up without being buffered.
- While the vehicle is driving, the display is updated via a buffering system.
- After circuit 15 is switched off, the pointer of the fuel level and reserve indicator is moved back to zero.
fuel level indicator sensor which is jammed tight is detected by comparing the change in fill level of the fuel tank with the calculated composite mileage. If the fill level drops faster over a particular distance than is technically feasible with the composite mileage, a defective fuel level indicator sensor is detected and an appropriate message is shown in the multifunction display.
Display of travel distance function sequence
The travel distance display function is made up of the following subfunctions:
- Determination of travel distance function sequence
- Display of main odometer reading function sequence
- Display of trip distance function sequence
- Storage of counter readings function sequence
Determination of travel distance function sequence
The instrument cluster calculates the travel distance from the signals received from the rpm sensors taking the tire circumference into consideration.
The tire size is coded via the diagnostics tester.
Function sequence, display of main odometer reading
The main odometer reading display is shown in the multifunction display. The maximum displayed counter reading on the main odometer is 1, 700, 000.
The display does not then start again at zero.
Display of trip distance function sequence
The trip distance display is shown in the multifunction display. The maximum displayed counter reading of the trip distance is 9999.9. If this value is achieved, the figure returns to zero.
Storage of counter readings function sequence
The main odometer reading is saved continuously to the nonvolatile part of the instrument cluster's internal memory. This memory guarantees the retention of the counter reading for at least five years even when the on-board electrical system battery (G1) is disconnected.
The current reading of the trip odometer is likewise stored in the nonvolatile memory of the instrument cluster.
Function sequence, gear display and transmission mode display
The data required for the gear indicator is transmitted by the EGS control unit (N15/3) (with transmission 722.6) or the fully integrated transmission control unit (VGS) (Y3/8n4) (with transmission 722.9) on the drive train CAN (CAN C).
The transmission mode information is made available on the drive train CAN by the intelligent servo module for DIRECT SELECT (A80). The CDI control unit or the ME-SFI [ME] control unit passes the information on to the central gateway control unit via the chassis CAN.
The central gateway control unit forwards the information to the instrument cluster via the central CAN.
Possible transmission modes are:
- "C" = Comfort (up to 31.8.10)
- "E" = Economy (as of 1.9.10)
- "S" = Sport
- "M" = Manual
The current gear is shown in the gear indicator (A1p12) and the current transmission mode is shown in the transmission mode display (A1p16) in the multifunction display.
Function sequence for display of charge level of high-voltage battery (on model 221.095/195)
The charge level of the high-voltage battery is indicated in the multifunction display in the form of a battery symbol together with power level as a percentage.
The display is called up by the following selection:
- Select "Trip" menu using system selection button (S110s3)
- Select hybrid display by scrolling using scroll forward and back button (S110s1)
The charge level of the high-voltage battery is also shown in the COMAND display (A40/8) (without code (867) SPLITVIEW) or in the SPLITVIEW display (A40/10) (with code (867) SPLITVIEW). Here too, the power level is given as a percentage. Additionally, the energy flow of the hybrid drive is shown by arrows.
The data required to display this is sent by the battery management system control unit (N82/2) to the COMAND display or the SPLITVIEW display via the drive train sensor CAN (CAN I), ME-SFI [ME] control unit, chassis CAN, central gateway control unit and central CAN.
The instrument cluster and the COMAND display or the SPLITVIEW display receive this data and evaluate it accordingly so that it can be displayed.
| Electrical function schematic of instrument cluster, operating condition display | Model 216 | PE54.30-P-2055-97CAA | |
| Model 221 (except model 221.095/195) | PE54.30-P-2055-97SAA | ||
| Model 221.095/195 | PE54.30-P-2055-97SAB | ||
| Component description for instrument cluster | A1 Model 216.3, model 221 (except 221.095/195) |
GF54.30-P-6000LE | |
| Model 221.095/195 | GF54.30-P-6000LEH | ||
| Component description for intelligent servo module for DIRECT SELECT | A80 With transmission 722.6 |
GF27.19-P-4020ACS | |
| With transmission 722.9 (except 722.931/950) | GF27.19-P-4020AHS | ||
| With transmission 722.931 | GF27.19-P-4020AHT | ||
| With transmission 722.950 | GF27.19-P-4020LEH | ||
| Component description for ME-SFI [ME] control unit | With engine 275 | GF07.61-P-6000MOS | |
| On model 221 with engine 276 | GF07.61-P-6000MMB | ||
| Component description for rear SAM control unit with fuse and relay module | N10/2 | GF54.21-P-6030LE | |
| Component description for electronic transmission control unit | N15/3 With transmission 722.6 |
GF27.60-P-5164ACS | |
| Component description for regenerative braking system control unit | N30/6 On model 221.095/195 |
GF42.22-P-1100LEH | |
| Component description for ESP control unit | N47-5 Model 216.3, model 221 (except 221.095/195) |
GF42.45-P-5118LE | |
| EZS control unit, component description | N73 | GF80.57-P-6003LE | |
| Component description for battery management system control unit | N82/2 On model 221.095/195 |
GF54.10-P-3012MEH | |
| Component description for central gateway control unit | N93 | GF54.21-P-4170LE | |
| Component description for fully integrated transmission control unit | Y3/8n4 With transmission 722.9 (except 722.931/950) |
GF27.60-P-5165AHS | |
| With transmission 722.931 | GF27.60-P-5165AHT | ||
| With transmission 722.950 | GF27.60-P-5165LEH | ||