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Display Operating Conditions, Function - GF54.30-P-3041GN

MODEL 166 as of model year 2016 

MODEL 292 

Function requirements, general 

IMPORTANT The electronic ignition lock control unit (N73) transmits the status of circuit 15 via chassis CAN 2 (CAN E2) to the instrument cluster (A1).

Display operating conditions, general 

The operating conditions display provides the driver with permanent information about the current operating conditions of the vehicle.

The operating conditions function includes the following subfunctions:

Display of speed function sequence 

The vehicle speed is calculated on the basis of the wheel speeds.

The Electronic Stability Program control unit (N30/4) transmits information about the wheel speeds via chassis CAN 1 (CAN E1), electronic ignition lock control unit and chassis CAN 2 to the instrument cluster. The instrument cluster calculates the current vehicle speed, compares it against an internally stored speedometer characteristic and actuates the speedometer (A1p8) accordingly via a stepper motor.

Display of engine speed function sequence 

The CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine) transmits information on the engine rpm via engine CAN (CAN C1) (with code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN))), powertrain control unit (N127) (with code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN))), chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster. The instrument cluster actuates the tachometer (A1p5) accordingly through a stepper motor.

Display of coolant temperature function sequence 

The CDI control unit or the ME-SFI [ME] control unit transmits information on the coolant temperature via engine CAN and drive train CAN (CAN C) (with code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN))), powertrain control unit (with code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN))), chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.

The instrument cluster controls the coolant temperature gauge (A1p1) (except ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN))) accordingly using a stepper motor.

The coolant temperature gauge is actuated via a correction characteristic. This correction characteristic defines the following four temperature ranges in which the coolant temperature display is actuated in different ways:

At coolant temperatures of T > 130 °C, the instrument cluster actuates the coolant temperature warning lamp (A1e54). A corresponding warning is shown in the multifunction display (A1p13) of the instrument cluster. If the instrument cluster does not receive any value for the coolant temperature, it actuates the coolant temperature warning lamp. The coolant temperature display is not actuated.

IMPORTANT If a fan motor (M4/7) is detected to be faulty, the actual coolant temperature is displayed. The coolant temperature warning lamp is also actuated.

IMPORTANT Model 166 as of model year 2016 with code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUGIN))

The coolant temperature can only be called up via the multifunction display using the "Service" menu.

Function sequence for power availability display (with code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN))) 

The output at any given time is shown as a percentage on the power display indicator (A1p19) in the instrument cluster. The instrument cluster calculates the display values using the status it receives from the power electronics control unit (N129/1) over the hybrid CAN (CAN L), powertrain control unit, chassis CAN 1, electronic ignition lock control unit and chassis CAN 2.

Function sequence for display of high-voltage battery charge level (with CODE ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN))) 

The high-voltage battery charge level is shown as a battery symbol with power rating as a percentage in the multifunction display.

The battery management system control unit (N82/2) evaluates the high-voltage battery data and transmits the relevant values via the hybrid CAN, the powertrain control unit, chassis CAN 1, the electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.

Display of travel distance function sequence 

The instrument cluster calculates the traveled distance from the wheel speeds, taking the tire circumference into consideration.

The Electronic Stability Program control unit sends information on the wheel speeds over the chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.

IMPORTANT The tire size is coded via the diagnostic unit.

The total distance is displayed in the multifunction display of the instrument cluster. The maximum displayed counter reading of the main odometer reading is 9.999.999. The display then overflows to 0.

However, the actual kilometer reading continues to be stored internally in the instrument cluster.

The trip distance is displayed in the multifunction display of the instrument cluster. The maximum displayed counter reading of the trip distance is 9999.9. If this value is reached, the figure returns to 0.

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 counter reading of the trip distance is likewise stored in the non-volatile memory of the instrument cluster.

Display of fuel quantity function sequence 

The level of the fuel tank is recorded by the left fuel tank fill level indicator sensor (B4/1) and the right fuel tank fill level indicator sensor (B4/2). The SAM control unit (N10) reads in the signals of the fuel display for the fuel level sensors and sends them over the interior CAN (CAN B) to the instrument cluster. The instrument cluster receives the signals for the fuel tank fill level sensors, evaluates them and actuates the fuel level indicator (A1p2) accordingly via a stepper motor.

When the reserve range is reached (approx. 12.5 % of maximum tank capacity), the instrument cluster actuates the fuel reserve warning lamp (A1e4). A corresponding message is shown on the multifunction display.

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:

IMPORTANT A jammed fill level sensor for the fuel tank fuel level indicator 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 specific distance than is technically feasible based on the composite mileage, the fuel tank fill level sensor is deemed to be defective and a corresponding message issued on the multifunction display.

Function sequence for gear display and transmission mode display 

The information on the engaged gear is shown in the gear indicator (A1p12).

Transmission mode information is displayed in the multifunction display via a pop-up.

On vehicles with code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN)), the fully integrated transmission control unit (Y3/8n4) transmits information on the engaged gear range and on the selected transmission mode via drive train CAN, ME-SFI [ME] control unit, engine CAN, powertrain control unit, chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster. On vehicles except code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN)), the fully integrated transmission control unit sends information on the engaged drive range and the selected drive program over the drive CAN, CDI control unit or the ME-SFI [ME] control unit, chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.

The instrument cluster actuates the gear indicator and the transmission mode display accordingly.

Function sequence for "ECO" display (with CODE B03 (ECO start/stop function)) 

The automatic engine start/stop is automatically activated following each change of ignition, and it can be activated or deactivated by pressing the ECO start/stop function button (N72/1s50) in the UCP control unit (N72/1).

The upper control panel control unit reads in the status of the ECO start/stop function button directly and sends this over the battery sensor LIN (LIN B15), SAM control unit, interior CAN, electronic ignition lock control unit and chassis CAN 1 to the CDI control unit or the ME-SFI [ME] control unit. The CDI control unit or the ME-SFI [ME] control unit checks all the function requirements and sends the status of the automatic engine start/stop over chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster. The operational readiness of the automatic engine start/stop is displayed for the driver on the multifunction display of the instrument cluster with the symbol "ECO".

IMPORTANT Model 166 as of model year 2016 with code B03 (ECO start/stop function)

Model 292

with code B03 (ECO start/stop function)

If the CDI control unit or ME-SFI [ME] control unit establishes in driving mode by means of the current parameters, that it is possible for the engine to stop automatically, however neutral was not engaged, the gearshift recommendation "→ N" is shown in the multifunction display.

Function sequence for HYBRID operating mode display (with CODE ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN))) 

With hybrid vehicles, it is possible to switch between the following four operating modes to the "Individual" drive program through either the operating mode selection button (N72/1s16) in the upper control panel control unit or by using the drive program switch in the center console:

The upper control panel control unit reads in the status of the operating mode selection button directly and transmits this via the battery sensor LIN, the SAM control unit, the interior CAN, the electronic ignition lock control unit, chassis CAN 1, the powertrain control unit, the engine CAN, the ME-SFI [ME] control unit and the drive train CAN to the fully integrated transmission control unit.

The audio equipment reads in the request for the selected operating mode from the Audio/COMAND control panel (A40/9) over the telematics CAN (CAN A) and sends this over the interior CAN, electronic ignition lock control unit, the chassis CAN 1, the powertrain control unit, the engine CAN, the ME-SFI [ME] control unit and the drive train CAN to the fully integrated transmission control unit.

The fully integrated transmission control unit checks all function requirements and sends the status of the operating mode over the drive train CAN, the ME-SFI [ME] control unit, the engine CAN, the powertrain control unit, chassis CAN 1, the electronic ignition lock control unit and chassis CAN 2 to the instrument cluster. The operational readiness of the operating mode is displayed to the driver in the multifunction display on the lower left of the instrument cluster by one of the following symbols: "HYBRID", "E-MODE", "E-SAVE", "CHARGE".

IMPORTANT Model 166

as of model year 2016

with code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUGIN))

Detailed information on the HYBRID modes is available in a separate document.

Function sequence for displaying transport mode 

Transport mode is activated at the factory at the end of the product process and sets the entire vehicle to a defined special state (e.g. limited vehicle speed or restricted outside lamp functions).

The transport mode remains active on its way from the production plant to the dealers and company-owned sales and service outlets around the world up to the so-called delivery inspection and the final handover to the end customers.

When transport mode is active, the message "Transport mode" and the charge level of the on-board electrical system battery are shown in the multifunction display of the instrument cluster in the form of a bar graph with 40 segments.

IMPORTANT Detailed information on transport mode is available in a separate document.

  Display operating conditions, function   PE54.30-P-2055-97NBA
  Overview of system components, instrument cluster (IC) component description   GF54.30-P-9996GN 
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