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

Model 190 

Function requirements in general 

Tml. 15 ON:

The electronic ignition lock control unit (N73) transmits the circuit status of circuit 15 to the instrument cluster (A1) via suspension CAN 1 (CAN E1), the AMG gateway control unit (N93/9) and the user interface CAN (CAN HMI).

Display operating conditions, general 

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

The "display operating conditions" function comprises the following subfunctions:

• Display of speed function sequence 
• Display of engine speed function sequence 
• Display of coolant temperature function sequence 
• Display of travel distance function sequence 
• Display of fuel quantity function sequence 
• Function sequence for gear display and transmission mode display 
• Function sequence for "ECO" display as of 01.12.2018 
• Function sequence for "ECO" display up to 30.11.2018 
• Function sequence for displaying transport mode 

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) sends information about the wheel speeds via chassis CAN 1 (CAN E1), the AMG gateway control unit and the user interface CAN to the instrument cluster. The instrument cluster calculates the vehicle speed, compares it with the internally stored speedometer characteristic, and then actuates the speedometer (A1p8) accordingly by way of a stepper motor.

Display of engine speed function sequence 

The ME-SFI control unit (N3/10) sends information about the engine speed via the engine CAN (CAN C), powertrain control unit (N127), chassis CAN 1, AMG gateway control unit and user interface CAN to the instrument cluster. The instrument cluster receives the engine rpm and actuates the tachometer (A1p5) accordingly by means of a stepper motor.

Display of coolant temperature function sequence 

The ME-SFI control unit sends information about the coolant temperature via the engine CAN (CAN C), powertrain control unit, chassis CAN 1, AMG gateway control unit and user interface CAN to the instrument cluster. The instrument cluster receives them and regulates the coolant temperature gauge (A1p1) (display with 12 segments) accordingly.

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:

• T = 0 up to 80°C: The actual coolant temperature is displayed. The display is not shown until T ≥ 40°C.
• T = 80 up to 115°C: The coolant temperature display displays a constant value of T = 90°C.
• T = 115 up to 120°C: The coolant temperature display displays a constant value of T = 95°C.
• T = 120 up to 130°C (start of red warning range): The coolant temperature display shows the actual coolant temperature.

At coolant temperatures of T > 130°C, the instrument cluster also displays the coolant temperature warning lamp (A1e54). An appropriate warning message appears 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 gauge is then not actuated.

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 about the wheel speeds via chassis CAN 1, the AMG gateway control unit and the user interface CAN to the instrument cluster.

The tire size is coded via the diagnostics tester.

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. It then changes back 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 total distance is always stored in the nonvolatile memory of the instrument cluster. 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 distance is likewise stored in the nonvolatile memory of the instrument cluster.

Display of fuel quantity function sequence 

The fill level of the fuel tank is acquired by the fuel tank fuel level indicator fill level sensor, left (B4/1).

The fuel system control unit (N118) reads in the signals from the fuel tank fill level sensor directly and sends information about the fill level of the fuel tank via the drive train CAN (CAN C1), the powertrain control unit, chassis CAN 1, the AMG gateway control unit and the user interface CAN to the instrument cluster. The instrument cluster receives the fill level of the fuel tank, evaluates it and regulates the fuel level indicator (A1p2) (display with 12 segments) accordingly.

When the reserve range is reached (approx. 12.5 % of maximum tank capacity), the instrument cluster actuates the fuel reserve warning lamp (A1e4). An appropriate message appears in the multifunction display of the instrument cluster.

The reserve range is defined by comparing the measured fill level against the 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.
• After an engine start the display value for t = 4 s is updated every t = 0.8 s, to maintain a value below the full on-board electrical system voltage. After this time, or as soon as the vehicle starts off, the display is updated with a delay.
• After circuit 15 is switched off, the fuel level indicator is switched off.

A jammed fuel tank fill level sensor is recognized by comparing the change in the fuel tank fill level against the calculated composite mileage. If the fill level over a certain distance drops more quickly than technically feasible based on composite mileage, the fill level sensor for the fuel tank fill level sensor is recognized as being defective. An appropriate message appears in the multifunction display of the instrument cluster.

Function sequence for gear display and transmission mode display 

Information on the gear and transmission mode is displayed on the instrument cluster's multifunction display. Information for this is sent by the dual clutch transmission control unit (N15/13) via the drive train CAN, the AMG gateway control unit and the user interface CAN to the instrument cluster.

Function sequence for "ECO" display as of 01.12.2018 

The ECO start/stop function is automatically activated after each change of ignition and can be deactivated or reactivated by pressing the ECO start/stop function button (N72/5s3) in the right lower control panel (N72/5).

The status of the ECO start/stop function button is read in by the AMG gateway control unit via the Drive Unit CAN (CAN DRVU), Drive Unit control unit (N145/1) and AMG FlexRay (Flex AMG) and transmitted to the ME-SFI control unit via suspension CAN 1, the powertrain control unit and the engine CAN. The ME-SFI control unit checks all function requirements and sends the status of the ECO start/stop function via the engine CAN, the powertrain control unit, chassis CAN 1, the AMG gateway control unit and the user interface CAN to the instrument cluster. The operational readiness of the ECO start/stop function is indicated to the driver by the "ECO" symbol on the multifunction display of the instrument cluster.

Function sequence for "ECO" display up to 30.11.2018 

The ECO start/stop function is automatically activated after every ignition change and can be deactivated and then activated again by pressing the ECO start/stop function button (S193/5).

The status of the ECO start/stop function button is read in by the AMG gateway control unit and sent via chassis CAN 1, the powertrain control unit and the engine CAN to the ME-SFI control unit. The ME-SFI control unit checks all function requirements and sends the status of the ECO start/stop function via the engine CAN, the powertrain control unit, chassis CAN 1, the AMG gateway control unit and the user interface CAN to the instrument cluster. The operational readiness of the ECO start/stop function is indicated to the driver by the "ECO" symbol on the multifunction display of the instrument cluster.

Function sequence for displaying transport mode 

Transport mode is activated at the factory at the end of the production 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 hand over to the end customers.

In active transport mode, the message "Transport mode" and the charge condition of the on-board electrical system battery are shown in the instrument cluster's multifunction display in the form of a bar graph with 40 stages.

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

	Electrical function schematic for instrument cluster operation status display		PE54.30-P-2055-97HBA
	Overview of system components, instrument cluster (IC) component description		GF54.30-P-9996RR