Display Operating Conditions, Function - GF54.30-P-3041GW
Model 463
as of Model year 2013
Function requirements, general
- Circuit 15 ON:
The electronic ignition lock control unit (N73) sends the circuit 15 status as of production date April 3rd, 2018 (except Model 463.432) over the user interface CAN (CAN HMI) or up to production date April 2nd, 2018 or on Model 463.432 over suspension 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 "display operating conditions" function comprises the following sub-functions:
- 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 display of ECO start/stop function (with code MJ7 (ECO start/stop function))
Display of speed function sequence
As of 03 04 2018 (except Model 463 342):
The Electronic Stability Program control unit (N30/4) uses the wheel speeds to calculate the vehicle speed and sends the vehicle speed via the chassis FlexRay (Flex E), electronic ignition lock control unit and user interface CAN to the instrument cluster. The instrument cluster then displays the vehicle speed.
Up to production date April 2nd, 2018 or with Model 463.342:
The vehicle speed is calculated on the basis of the wheel speeds.
The Electronic Stability Program control unit sends information on the wheel speeds over suspension CAN 1 (CAN E1), the electronic ignition lock control unit and suspension CAN 2 to the instrument cluster.
The instrument cluster calculates the current vehicle speed, compares it against an internally stored speedometer characteristic, and then actuates the speedometer (A1p8) to match by way of a stepper motor.
Display of engine speed function sequence
As of 03 04 2018 (except Model 463 342):
The CDI control unit (N3/9) (diesel engine) or the ME-SFI control unit (N3/10) (gasoline engine) sends information about the engine speed via the engine CAN (CAN C), the powertrain control unit (N127), the chassis FlexRay, the electronic ignition lock control unit and the user interface CAN to the instrument cluster. The instrument cluster receives the engine RPM value and then displays it.
Model 463 (except 463.342)
as of Model year 2019
with code J25 (Widescreen cockpit)
The engine speed is not displayed permanently.
Up to production date April 2nd, 2018 or with Model 463.342:
The CDI control unit (engine 642.8) or the ME-SFI [ME] control unit
(engine 157, 273) sends information on the engine speed over
suspension CAN 1, the electronic ignition lock control unit and
suspension CAN 2 to the instrument cluster.
For vehicles with engine 176, the ME-SFI [ME] control unit sends
information on the engine speed over the engine CAN (CAN C1),
powertrain control unit, suspension CAN 1, electronic ignition lock
control unit and suspension CAN 2 to the instrument cluster.
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
As of production date April 3rd, 2018 (except Model 463.342):
The CDI control unit or ME-SFI control unit sends information on the coolant temperature to the instrument cluster via engine CAN, powertrain control unit, suspension FlexRay, electronic ignition lock control unit and user interface CAN. The instrument cluster receives the value for the coolant temperature and actuates the coolant temperature gauge 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 is displayed in different ways: T = 0 to 80 °C
The coolant temperature display shows the actual coolant temperature as from T = 50 °C.
T = 80 to 115 °C:
The coolant temperature display constantly shows a value of T = 90 °C.
T = 115 to 124 °C:
The coolant temperature display constantly shows a value of T = 95 °C.
T = 124 to 130 °C (start of red warning zone):
The coolant temperature gauge shows the actual coolant temperature.
At coolant temperatures of T > 124 °C the coolant temperature warning indicator is shown and a warning message is issued.
If the instrument cluster does not receive a value for the coolant temperature, it permanently actuates the coolant temperature warning indicator. The coolant temperature display is not actuated.
Up to 02 0 4 2018 or with Model 463 342:
The CDI control unit (engine 642.8) or the ME-SFI control unit (engine 157, 273) sends information about the coolant temperature via chassis CAN 1, the electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.
On vehicles with engine 176, the ME-SFI control unit sends information about the coolant temperature via the engine CAN, powertrain control unit, chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.
The instrument cluster receives the value for the coolant temperature and actuates the stepper motor of the coolant temperature display (A1p1) 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 constantly shows a value of T = 90 °C.
- T = 115 up to 120 °C: The coolant temperature display constantly shows a value of T = 95 °C.
- T = 120 up to 130 °C (Start of red warning range): The actual coolant temperature is displayed.
At coolant temperatures of T > 124 °C the coolant temperature warning lamp (A1e54) is actuated and a warning message is issued on the multifunction display (A1p13).
If a fan motor (M4/7) is recognized as faulty, the actual coolant temperature is displayed on the coolant temperature gauge. The coolant temperature warning lamp is also actuated.
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.
Display of travel distance function sequence
The instrument cluster calculates the traveled distance from the wheel speeds, taking the tire circumference into consideration.
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 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.
Display of fuel quantity function sequence
As of 03 04 2018 (except Model 463 342):
The fuel system control unit (N118) sends information on the fill level of the fuel tank via the drive train CAN (CAN C1), powertrain control unit, chassis FlexRay, electronic ignition lock control unit and user interface CAN to the instrument cluster. The instrument cluster receives this information, evaluates it and indicates the fill level in the form of a bar graph.
When the reserve range (approx. 12.5% of the maximum tank volume) is reached, the instrument cluster actuates the reserve indicator, hides the bar graph display, displays a gas station symbol (gasoline pump (yellow)) and outputs a message. The reserve range is defined by comparing a measured fill level against the stored tank characteristic. If the reserve range drops to approx. 50 %, a gas station symbol (gasoline pump) is displayed in the Range menu instead of the distance reading.
If the fill level of the fuel tank drops more quickly than technically feasible based on composite mileage, the left fuel tank fuel level indicator fill level sensor (B4/1) is deemed to be defective and a corresponding message is displayed in the instrument cluster.
Up to production date April 2nd, 2018 or Model 463.342:
The fuel tank fill level sensor fuel level indicator (B4) records the fill level in the fuel tank. The SAM control unit (N10) reads in the signal from the fill level sensor for the fuel tank fuel level indicator and sends information on the fill level of the fuel tank over the interior CAN (CAN B) or with code E11 (Stealth lights with convoy marking) over the interior CAN, stealth lights control unit (N1) and the instrument cluster CAN (CAN IC) to the instrument cluster. The instrument cluster receives the signals of the fill level sensor for the fuel tank fuel level indicator, evaluates them and actuates the stepper motor of the fuel level indicator (A1p2) accordingly.
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:
- After switching on circuit 15, the current fill level is displayed. In the process the pointer runs up in a buffered manner.
- 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.
- When circuit 15 is switched off, the pointer of the fuel level indicator is suppressed and moves back to 0.
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 over a certain distance drops more quickly than technically feasible based on composite mileage, the fill level sensor for the fuel tank fuel level indicator is recognized as being defective and a corresponding message is shown in the multifunction display.
Function sequence for gear display and transmission mode display
As of 03 04 2018 (except Model 463 342):
The engaged gear range and the active transmission mode are displayed in the right part of the instrument cluster (in the tachometer).
The fully integrated transmission control unit (Y3/8n4) sends corresponding information for the display via the drive train CAN, powertrain control unit, chassis FlexRay, electronic ignition lock control unit and user interface CAN to the instrument cluster.
Up to 02 04 2018 or Model 463 342:
The gear indicator and transmission mode display are shown on the instrument cluster.
Gear indicator:
The DIRECT SELECT INTERFACE (N150) sends the data required for the gear indicator via the drive train CAN (CAN C), CDI control unit (engine 642.8) or ME-SFI control unit (engine 157, 273), chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.
On vehicles with engine 176, the DIRECT SELECT INTERFACE sends the data required for the gear indicator via the drive train CAN, powertrain control unit, chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.
The instrument cluster received this data and outputs the gear on the gear indicator (A1p12) or in the multifunction display.
Transmission mode display:
The fully integrated transmission control unit sends the information about the drive program over the drive train CAN, CDI control unit (engine 642.8) or the ME-SFI [ME] control unit (engine 157, 273), suspension CAN 1, electronic ignition lock control unit and suspension CAN 2 to the instrument cluster.
On vehicles with engine 176, the fully integrated transmission control unit sends information about the transmission mode via the drive train CAN, powertrain control unit, chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.
The instrument cluster displays the transmission mode on the transmission mode display (A1p16).
Function sequence for display of ECO start/stop function (with code MJ7 (ECO start/stop function))
As of production date April 3rd, 2018 (except Model 463.432):
The ECO start/stop function is activated automatically after each ignition cycle and can be manually deactivated or reactivated.
When the vehicle is at a standstill, the operational readiness of the ECO start/stop function is indicated to the driver by means of a corresponding symbol. The request for this is sent by the CDI control unit or the ME-SFI [ME] control unit over the engine CAN, powertrain control unit, suspension FlexRay, electronic ignition lock control unit and the user interface CAN to the instrument cluster.
If, while the vehicle is being driven, the ME-SFI control unit detects on the basis of the currently available parameters that an automatic engine stop is possible but neutral position has not been engaged, the gearshift recommendation "→ N" is shown in the instrument cluster.
Up to production date April 2nd, 2018 or for Model 463.342:
The ECO start/stop function is 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 upper control panel control unit (N72/1).
The status of the ECO start/stop function button is directly read in by the upper control panel control unit and it sends this (except with code E11 (Stealth lights with convoy marking)) 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 (engine 642.8) (as of production date September 1st, 2015) or the ME-SFI [ME] control unit (engine 157, 273).
With code E11 (Stealth lights with convoy marking), the upper control panel control unit sends the status over the battery sensor LIN, stealth lights control unit, stealth lights LIN (LIN B40), SAM control unit, interior CAN, electronic ignition lock control unit and chassis CAN 1 to the CDI control unit (engine 642.8) (as of production date September 1st, 2015) or the ME-SFI [ME] control unit (engine 157, 273).
On vehicles with engine 176, the upper control panel control unit reads-in the status of the ECO start/stop function button directly and then sends it (except with code E11 (Stealth lights with convoy marking)) over the battery sensor LIN, SAM control unit, interior CAN, electronic ignition lock control unit, chassis CAN 1, powertrain control unit and the engine CAN to the ME-SFI [ME] control unit. With code E11 (Stealth lights with convoy marking), the upper control panel control unit sends the status over the battery sensor LIN, stealth lights control unit, stealth lights LIN, SAM control unit, interior CAN, electronic ignition lock control unit, chassis CAN 1, powertrain control unit and engine CAN to the ME-SFI [ME] control unit.
If the function requirements are fulfilled the driver is notified of the operational reliability of the ECO start/stop function in the multifunction display of the instrument cluster. The request for this is sent by the CDI control unit (engine 642.8) (as of production date September 1st, 2015) or the ME-SFI [ME] control unit (engine 157, 273) over chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.
On vehicles with engine 176, the ME-SFI control unit sends the request for this over the engine CAN, powertrain control unit, chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.
If, while the vehicle is being driven, the ME-SFI control unit detects on the basis of the currently available parameters that an automatic engine stop is possible but neutral position has not been engaged, the gearshift recommendation "-+ N" is shown in the multifunction display.
| Electrical function schematic of instrument cluster, operating condition display | Model 463 (except 463.342) as of Model year 2019 | PE54.30-P-2055-97ZGB | |
| Model 463 (except 463.342) as of Model year 2013 up to Model year 2019 Model 463.342 as of Model year 2017 |
PE54.30-P-2055-97ZGA | ||
| Overview of system components, instrument cluster (IC) component description | GF54.30-P-9996GW |